Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

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Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Water Treatment Companies Rated Highest in Quality and Helpful Expertise®?

You are the customer. If your goal is to choose a water treatment company that will deliver high customer satisfaction and quality, you’ll feel confident in choosing a Diamond Certified water treatment contractor. Each has been rated Highest in Quality and Helpful Expertise® in the most accurate ratings process anywhere. And you’re always backed by the Diamond Certified Performance Guarantee. Here’s why the Diamond Certified ratings and certification process will help you find a top rated water filtration company and is unparalleled in its accuracy, rigor and usefulness:

1) Accuracy: All research is performed by live telephone interviews that verify only real customers are surveyed, so you’ll never be fooled by fake reviews.

2) Statistical Reliability: A large, random sample of past customers is surveyed on an ongoing basis so the research results you see truly reflect a Diamond Certified company’s top rated status.

3) Full Disclosure: By clicking the name of a company above, you’ll see the exact rating results in charts and read verbatim survey responses as well as researched articles on each qualified company.

4) Guaranteed: Your purchase is backed up with mediation and the Diamond Certified Performance Guarantee, so you can choose with confidence.

Click on the name of a Diamond Certified company above to read ratings results, researched articles and verbatim customer survey responses to help you make an informed decision.

More than 200,000 customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality and Helpful Expertise®–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified Resource eliminates mediocre and poorly performing companies. Read detailed information about the ratings and certification process.

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Jim Fisher is a third-generation water treatment professional and president of Culligan Water of Sonoma County, a Diamond Certified company since 2002. He can be reached at (707) 706-3947 or by email.

Jim Fisher

diamond certified contributor profile and expert article

Jim Fisher: Thicker Than Water

By James Florence, Diamond Certified Resource Reporter

SANTA ROSA — It’s often said that blood is thicker than water, but in Jim Fisher’s case, the two are more or less inseparable. “My grandfather started the Sonoma County franchise of Culligan Water in 1945, so I’m the third generation of my family to run it,” he explains. “My grandfather was always a big influence on me—I was named after him, and growing up, I loved him and thought he was the greatest. I started working at his store as a teenager, which is where I really got exposed to the business and grew to like it. I had a dream of becoming a pro golfer, but by age 18, it was pretty obvious that wasn’t going to happen, so I decided to stick with the family business.”

Today, as president of Culligan Water of Sonoma County, Jim enjoys being involved in all aspects of the company. “I wear a lot of different hats,” he affirms. “When you’re not limited to one particular subset, it makes for a pretty broad brush of what your workday looks like, and that’s something I really like.”

A resident of Santa Rosa (where he lives with his wife, Suzanne), Jim expresses his appreciation for his longtime hometown. “I feel very fortunate to be living in the same town where I was born and raised. Some people can’t wait to get out of their hometowns, but I think most of my friends who have moved away would love to be able to come back here.”

Outside of work, Jim engages in a variety of active pastimes, including playing and watching sports. “I love golf—I’ve been playing all my life and it’s still my number one pastime,” he says. “I also love basketball. I’ve been a Golden State Warriors season ticket holder since the early 1980s, so I’ve been with them all the way from their lowest points to their recent ascension to glory.” Jim also enjoys vacationing at tropical locales. “I love any place that has a beach, whether it’s Mexico, the Caribbean or Hawaii.” Additionally, Jim likes keeping in touch with his two grown children, Jonathon and Christina.

In regard to his professional career, Jim espouses the importance of fairness. “I think we have great empathy for our customers—after all, without them, we wouldn’t exist,” he explains. “That’s why we strive to deal fairly with customers in all aspects, from our pricing to our contracts. If there’s ever an issue, the customer doesn’t have to twist our arm to get us to make it right.”

When asked the first thing he’d do if he were to retire tomorrow, Jim says he’d head to his favorite kind of destination. “I’d take a trip to Hawaii or some other tropical place. That’s definitely our go-to thing when traveling. You won’t find me at the glaciers in Alaska or in a cold region of Europe—I’ll always be where the weather is warm and there’s a sandy beach.”

Ask Me Anything!

Q: What kind of music do you like?
A: The classic rock I grew up listening to in the 1970s.

Q: What’s your earliest memory?
A: Spending time with my grandfather on his property. He was the kind of guy who, when you hung out with him, your day was just filled with good stuff.

Q: If you could travel anywhere in the world, where would you go?
A: Phuket, Thailand. I have a lifelong friend who has lived there for the past 30 years and I still haven’t visited him.

Q: What’s your favorite snack?
A: Animal crackers.

Q: What’s your favorite holiday?
A: The Fourth of July. For one, it takes place in summer, which is my favorite time of year. And since my son recently started his military service, it now has a bigger patriotic component for me as well.

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Water Filtration System Installation


SANTA ROSA — There are plenty of things a handy homeowner can install independently, but when it comes to a new water filtration system, it’s best to rely on the expertise of a professional. A lot of do-it-yourselfers make the mistake of… Read more

Expert Video Tip

Video: Installing a Water Filtration System

Complete Video Transcription:

SANTA ROSA — Host, Sarah Rutan: There are plenty of things a handy homeowner can install, but when it comes to a new water filtration system, it’s best… Read more




3M Filtrete Water Systems
InstapureWater Filtration Systems
Mavea Water Purification
Insinkerator Water Filtration Systems
Rainsoft Water Treatment Systems
Aquasana Water Filtration
PUR Water Filtration Systems
GE Water Filters
Culligan Water Treatment
Pure Aqua Reverse Osmosis Water Purification Systems
Emerson Water Treatment
DuPont Chlorine Dioxide Wastewater Treatment Systems
Brita Water Filtration Systems

reverse osmosis water filtration systems
hard water filtration
sulfur water filtration
whole house water systems
water odor treatment systems
water system contaminant filtration
residential water treatment
commercial water treatment
water filters
water softeners
drinking water treatment
rusty water treatment
wastewater treatment
well water treatment
iron water treatment
acid well water treatment
bottled water delivery
industrial water treatment

Agua Caliente
Alexander Valley
Bodega Bay
Boyes Hot Springs
Camp Meeker
Duncans Mills
El Verano
Fetters Hot Springs
Fort Ross
Glen Ellen
Mark West
Monte Rio
Rio Nido
Rohnert Park
Russian River
Russian River Meadows
Salmon Creek
Santa Rosa
Stewarts Point Rancheria
the Geysers
Sea Ranch
Two Rock
Valley Ford
Villa Grande


Know What You Want
What to Know Before Interviewing Local Water Filtration Experts

You’re more likely to get a good outcome on the water treatment services you need if you take a few minutes to think about what you expect from the company you hire to do the work.

When starting your search for a local water treatment company, whether it’s in Petaluma, Windsor, Healdsburg, Santa Rosa, Sonoma, Cloverdale, Sebastopol, Cotati, Guerneville and Rohnert Park or another location, begin by asking yourself a few basic questions about the type of water filtration services you need. Write down your answers as having specific goals can help you present a coordinated case to the companies you interview.

Sample questions include these:

  1. Do I want a Diamond Certified water filtration company that is rated best in quality and backed by the Diamond Certified Performance Guarantee?
  2. Do I know what problems my water has (hard water, chlorine taste, sediment in water, poor well water, sulfur water, rusty water, etc.)?
  3. Do I need a water test to narrow down my water problems?
  4. Do I need a water filter for my entire home or business?
  5. How much water flow do I need or expect? (Water filters often restrict water flow, some more than others. It is important to know how much water flow you want and expect, so that you can have a better chance of getting the filtration system that best meets your needs.)
  6. What is my budget for a new water filtration system?
  7. What professional qualities and characteristics do I want from my Sonoma County water filtration experts? (These may include timeliness, cleanliness, good communication skills, knowledge base, experience, and follow-up service.)
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What To Ask In Person
Meet Sonoma County Water Filtration Contractors in Person

After you’ve completed your phone interviews of local water filtration companies, you’ll want to invite representatives from the stand-out services to your home or business to see the job in question and give you an estimate for your new water treatment system installation.

Again, write down the answers you get to the questions below and any others that are pertinent to your needs so you can easily compare the water filtration services in Guerneville, Santa Rosa, Sebastopol, Cotati, and Cloverdale and other areas that you’ve interviewed.

Sample questions include these:

  1. What problems do you notice with my water? (Examples include dead in the water, bad-tasting well water, chlorine water, hard water, sulfur water, water odor, dangerous water contaminants, rusty water, acid well water, sediment in water.)
  2. How do you recommend we treat the water problems?
  3. Do these water quality problems require whole house water filters, or can we use a single tap water filter?
  4. What products do you recommend? (Whole house water filter, reverse osmosis water filter, hard water filtration, sulfur water filtration, water softener system, etc.?)
  5. What is the total cost expected to purchase the water filtration system?
  6. What is the upkeep and filter cost going forward with this water filtration system?
  7. Will this water filtration system use a lot of electricity? Is my home electrical system big enough to handle the extra load?
  8. Do your water filtration systems come with an indicator light or alarm that will advise us of a problem with the filter or a system malfunction?
  9. What is the expected life of this water treatment or filtration system?
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  • What To Ask References
    Ask References of Sonoma County Water Purification Companies About Their Experiences

    It’s best to choose a Diamond Certified water treatment company because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a water treatment company in Sonoma County and the Greater Bay Area, you can have confidence choosing a Diamond Certified company.

    Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If you can’t find a Diamond Certified water treatment company within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by your Sonoma County water treatment company.

    Keep in mind, though, that references provided to you by Sonoma County water treatment companies in Guerneville, Santa Rosa, Sebastopol, Cotati, and Cloverdale and other areas are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process.

    If you do call references on your own, specifically ask for a list of the water treatment company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied.

    A list of sample questions is below.

    1. Were you satisfied with the service from _(water treatment company name)_?
    2. What was the type and scope of job they did for you (new home water treatment system installation, reverse osmosis water treatment system, water softener installation, acid water filter services, well water filtration, whole house water system, sulfur water filtration, commercial water treatment, industrial water treatment, water contaminant filtration system, etc.)?
    3. Were the Sonoma County water filtration system installers prompt and personable?
    4. Did the water treatment contractor explain to you the status of the work?
    5. Did the water treatment experts finish the work on time?
    6. Were there unexpected costs with the water filter installation or operation? If so, what were the extra costs for and were they avoidable?
    7. Did the electricians charge extra to travel to your home if you live in a smaller Sonoma County area such as Agua Caliente, Kenwood, Jenner, Lytton, Russian River Meadows, Rio Nido, Monte Rio, Mark West, Schellville and beyond?
    8. Did the water treatment contractors clean up after finishing the job?
    9. Would you recommend this water filtration company’s services to friends or family?
    10. When you need water filtration service in the future, will you hire this Sonoma County water treatment company again?
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  • Review Your Options
    Narrow Down Your List to the Good Water Treatment Services in Sonoma County

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    There are many good water treatment companies in Sonoma County, including those in Petaluma, Windsor, Healdsburg, Santa Rosa, Sonoma, Cloverdale, Sebastopol, Cotati, Guerneville and Rohnert Park and other areas near you.

    Before deciding on the best water treatment company in Sonoma County for you, it’s important to consider the following questions.

    1. Is there a water treatment company on your list that can meet your needs for water testing, home water treatment and filtration services, water system supplies and materials, water filter brands and installation, or repair requirements?
    2. Are the Sonoma County water treatment experts you spoke with knowledgeable about the cause of your water problems and the water treatment systems or water filtration equipment you need?
    3. Can they easily explain to you which water filtration or treatment products and brands best fit your needs?
    4. Is the Sonoma County water filtration company sensitive to your budget? Can they give you varying bids for equipment that meets your needs and your budget?
    5. Do the water filtration services guarantee their work and offer warranties on the water treatment equipment and products they supply?
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  • How To Work With
    What to Know Before You Hire Water Treatment Services in Sonoma County

    Just like homeowners can be choosy about whom they hire, many water treatment companies and other service businesses prefer to work with customers who are reliable, fair and honest. Bids can be expensive to prepare and no water filtration service wants to waste time bidding on a job that homeowners aren’t serious about.

    How can you be the kind of homeowner that the best water filtration companies in Santa Rosa, Petaluma, Rohnert Park, Windsor, Healdsburg, Sonoma and Cloverdale and the rest of Sonoma County want to work with? See the tips below.

    • Hire a water treatment company based on value, not just the lowest bid. Many people start their discussion with Sonoma County water purification services by asking about price. Show your interest in quality water treatment systems by asking questions about the products, installation techniques, warranties and overall value rather than price alone.
    • Be upfront with the water treatment companies you’re interviewing if you’re accepting multiple bids for the work. But only shop among carefully-selected water filtration companies that offer quality work and don’t accept more than three to five bids.
    • Tell your Sonoma County water treatment company exactly what your water problems are, what water filtration systems you are interested in, and every specific direction or request you have. This will enable them to give you an accurate bid for the work and gives them insight into exactly what you want. If they can’t provide what you need or want, it’s better to find out before you’ve wasted your time and theirs.
    • Interview and choose among local water treatment services in Sonoma County. Most water filtration services prefer to work within a smaller radius, as this allows them to provide faster service and reliable customer service without having to travel long distances or make appointments long in advance.

    Once You’ve Found Sonoma County Water Filtration Specialists
    Now that you’ve found the water treatment company in Sonoma County that best fits your needs, whether it’s in Cotati, Windsor, Petaluma, Santa Rosa, Rohnert Park, Guerneville and Healdsburg, Salmon Creek, Stewarts Point Rancheria, Alexander Valley, Bodega Bay, Cazadero, Duncans Mills, Freestone or another area, move forward and sign a contract for services. Good contracts should include details about the scope of the water treatment work, any materials and filtration products to be used, payment terms, the expected time line for the job and any warranties and guarantees that will cover the new water filtration system.

    Your water filtration company should provide the contract to you and allow you to read through it and ask any questions you may have before signing it. This agreement protects you, your property and the contractor, so it’s important that you understand all terms and exclusions. Never sign an incomplete or blank estimate or contract.

    Write in any items you verbally agreed upon with your water treatment provider. These may include expectations and instructions, start and end dates, stipulations for when the work must be completed, and any bonuses or offers you wish to extend for early completion of the work.

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  • Be a Good Customer
    Benefits of Being a Good Water Filtration Company Customer

    It’s the water treatment company’s responsibility put in quality water filters using the best possible installation techniques. But you play a big part in the success of your home water treatment work, too.

    Here are a few simple steps you can take to be a good customer when hiring Sonoma County water treatment companies.

    Be clear and upfront with the water treatment company. Let them know what you want from your water treatment company, the long-term outcome you’re expecting and specific ways they can satisfy your expectations.

    • Remember, a friendly smile goes a long way in fostering and maintaining a good working relationship with your Sonoma County water filtration service.
    • Before you hire a water treatment company in Sonoma County, restate your expectations and goals, and reiterate to the water treatment company representative your understanding of the agreement. Most problems with local water treatment company occur because of a breakdown in communication. By being clear about your expectations and theirs, you can avoid most conflicts.
    • Ask your water treatment company if you should call to check on the progress or if he will call you with updates.
    • Be sure your service representative has a phone number where they can reach you at all times while they’re water treatment company. The work will move along more smoothly if your water treatment company can reach you for any necessary updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly to keep the water treatment company on schedule.
    • Pay for the water treatment company work promptly.

    Why would you want to be a good customer? Water treatment company in Sonoma County, including those in Santa Rosa, Petaluma, Sebastopol, Cotati, Cloverdale and Rohnert Park and beyond, appreciate customers who are straightforward, honest and easy to work with.

    Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

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Check The Work
Make Sure Your Sonoma County Water Treatment Company Has Provided What Was Promised

When the new water filtration system or water treatment equipment is installed, it’s your job to verify all work was done correctly and all items were installed as promised. It’s best to do this before your Sonoma County water treatment contractor leaves the jobsite for the last time. This way, if there are questions or discrepancies, you are more likely to get answers.

Before your water filtration contractor leaves, ask them to walk you through the job, showing you what was done and how to run the system. Ask for any special instructions on operating, maintaining or servicing your equipment. Then, ask for a written invoice before you settle the bill.

The invoice from your water treatment company company should include the following:

  • The water treatment company contractor’s name, physical address and state license number.
  • A complete list of all work performed.
  • An itemized list of all materials used.
  • The total cost for the water treatment company services, including the itemized amount charged for labor.
  • A written explanation of any warranties or guarantees provided by the product manufacturers and the water treatment company contractors.
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Written Warranties
Written Guarantees on New Home Water Filtration System

The better Sonoma County water treatment companies offer warranties and guarantees on both their workmanship, equipment and materials. Some guarantees will be honored by the company (usually guarantees dealing with workmanship, installation and services), while the equipment manufacturers will be responsible for honoring other warranties (usually on the equipment itself).

Whether you are hiring a water treatment contractor in Guerneville, Santa Rosa, Sebastopol, Cotati, and Cloverdale or beyond, it’s important that you ensure your new water filtration equipment and systems are covered by warranties that will protect you, your home and the value of your new filtration system. Be sure you know which entity is responsible for guaranteeing your home water filtration system, and who to contact in the event of a system failure or product malfunction.

Getting all warranties and guarantees in writing is key to understanding and confirming system protection. The following items should be included in any written guarantee document:

  • The Sonoma County water treatment contractor’s name, physical address and state license number.
  • A description of what exactly the warranty covers. This should include whether the water filtration contractor will repair or replace any faulty materials or workmanship or whether you are responsible for contacting the manufacturer for assistance.
  • Any exclusions must be explicitly stated.
  • Your responsibility in the case of a problem with or failure of your water treatment system or water filter, and what you need to do in order to redeem the warranty.
  • How long the warranty is valid, and whether it expires on a specific day or is prorated (meaning, the warranty coverage and amount owed for repair or replacement diminishes over time).
  • If the warranty coverage is transferable to the new owner if you sell the home or commercial building in which the work was done.
  • Any actions on your part that may invalidate the warranty.
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Top 10 Requests
Water Treatment Options and Water Filtration Services Available in Sonoma County

You will have to contact your local water treatment companies to find out exactly which water filtration systems and services they recommend for your needs. Some of the most popular in Petaluma, Windsor, Healdsburg, Santa Rosa, Sonoma, Cloverdale, Sebastopol, Cotati, Guerneville and Rohnert Park and beyond are listed below.

Sonoma County Residential Water Treatment
Residential water treatments are those commonly installed in homes, apartments and condominiums. These may include water filtration systems, water softeners, faucet water filters, reverse osmosis water filtration systems, systems to remove unwanted odors and taste from water, and other systems to make home water more potable.

Reverse Osmosis Water Filtration Systems
Reverse osmosis dissolves ions in water by forcing water through a semi-permeable membrane. This allows water to pass through, while separating out most suspended and dissolved materials. Reverse osmosis is so named because mechanical pressure is used to force the water to flow in the direction that is the reverse of natural osmosis.

Hard Water Filtration Systems
Hard water filtration systems remove calcium, magnesium and other materials from water.

Whole House Water Systems
These water filtration systems are usually installed in the basement or near the main water line, and they are used to filter all water coming into a home. Rather than filtering only water in certain faucets or rooms, all water in the home is filtered using the same equipment. This is especially useful for homes that use well water, have hard water, water with too many minerals, or water that has sulfur or iron content.

Drinking Water Treatment Systems
Well water, municipal water supplies and other drinking water sources may include chlorine, sediment, iron, or other organic and non-organic contaminants. Treatment systems for drinking water include filters to remove these contaminants, softeners to remove magnesium and calcium, and filtration to remove chlorine.

Well Water Treatment
Well water can contain contaminants including sediment, iron, phosphates, runoff from local farms, and other unwanted organic and inorganic contaminants. Well water treatment systems remove these contaminants so that the water is safe for drinking and use in the home.

Commercial Water Treatment Systems
Commercial water treatment systems are installed in commercial buildings such as public buildings, schools, hospitals, municipal and government buildings, workplaces, airports, offices, shopping centers and other non-residential facilities. These may include chlorine removal systems, water filtration for well water, hard water filtration systems, mineral removal systems and solid material filters.

Water Filters in Sonoma County
Water filters are equipment used to filter out solid particles, organic material, inorganic material, minerals, and other contaminants in water. Water filters may be in pitchers, refrigerators, individual sinks or whole house/whole building filtration systems.

Water Softeners
Water softeners remove calcium, magnesium and other minerals that cause hard water. Hard water can cause lime and build up on sinks, faucets, showers and other materials.

Iron Water Treatment
Water with iron particles present may smell bad, taste bad, have a strange color, and may even cause staining on clothing, sinks and other items. Iron water treatment often includes filtration to remove iron from the water, making it more palatable and better for use around the home.

Common Brands of Water Treatment Equipment or Water Filters
Different Sonoma County water filtration services recommend various water treatment equipment depending on their experiences and the needs of their customers. Below, you’ll find a list of some of the most common water treatment equipment and water filters available in Sonoma County and across the Greater Bay Area.

  • Aquasana Water Filtration
  • PUR Water Filtration Systems
  • GE Water Filters
  • Culligan Water Treatment
  • Pure Aqua Reverse Osmosis Water Purification Systems
  • Emerson Water Treatment
  • DuPont Chlorine Dioxide Wastewater Treatment Systems
  • Brita Water Filtration Systems 
  • 3M Filtrete Water Systems
  • InstapureWater Filtration Systems
  • Mavea Water Purification
  • Insinkerator Water Filtration Systems
  • Rainsoft Water Treatment Systems
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Glossary Of Terms
The Diamond Certified Performance Guarantee for Water Treatment Services

Water treatment has its own vocabulary. The following words and terms will help you better communicate with your water treatment expert and get the water filtration system for your home or business that best fits your needs.

activated carbon
Activated carbon water filters clean water by flushing it through block, granulated or powdered carbon material (usually coal, wood or coconut shells) to filter out and absorb contaminants such as chlorine, organic chemicals, radon and other organic materials from drinking water.

Water treatment has its own vocabulary. The following words and terms will help you better communicate with your water treatment expert and get the water filtration system for your home or business that best fits your needs.

activated carbon
Activated carbon water filters clean water by flushing it through block, granulated or powdered carbon material (usually coal, wood or coconut shells) to filter out and absorb contaminants such as chlorine, organic chemicals, radon and other organic materials from drinking water.

Also known as: activated carbon water filters

aggressive water
Aggressive water is the term for water that contains acid or oxygen that corrodes or rusts metals.

Also known as: acid water, oxygenated water, acidic water

alkali water
Alkalis such as potassium, magnesium, soluble hydroxide, carbonate, bicarbonate salt of calcium or sodium may be present in water. This can cause dry skin, bitter tasting or slippery feeling water.

Also known as: alkalis, alkaline water, alkalinity

Bacteria in water are single-celled microorganisms that are sometimes found in drinking water. Most city water is treated with chlorine, which kills bacteria. But some types of bacteria, such as giardia, cryposporidium and others can have a degree of immunity to chlorine and may need to be removed by filtration.

Also known as: water bacteria, bacteria in water

Calcium can be found dissolved in drinking water and causes scale, soap scum and other hard water effects. Calcium is safe to drink, but many people want to filter it out of their water for better taste and cleaner surfaces.

Also known as: lime, calcium water, hard water

Chlorine is a disinfectant used by many municipal water systems. Chlorine may make water safer to drink, but it may leave behind an aftertaste.

Also known as: chlorine water, chlorinated water, water disinfected with chlorine, chlorine-added water

The process of removing alkalinity (or lime) from water.

Also known as: lime removal, alkaline water removal

Removing chlorine from water using activated carbon or catalytic filters.

Also known as: chlorine water removal, chlorine removal, activated carbon water filtration

The act of removing salt from water to make it drinkable. Water desalination is usually accomplished through reverse osmosis, distillation, or electrodialysis.

Also known as: removing salt from water, water desalination

A device that removes contaminants, taste, odor and color from drinking water. Filters may be whole house water filtration devices, water filter pitchers, sink filters or cartridge water filters.

Also known as: water filtration devices, water filters

The process of running water through some type of porous filtration device or filter to remove solids and other contaminants that cause water to be unsafe, taste or smell badly or have a color that makes it unsatisfactory to drink.

Also known as: water filtration, clean water filtration

flow rate
The rate at which a liquid (usually water) flows through a filter. Flow rate for water filters is usually rated in gallons per minute per cubic foot of filter. The flow rate must be what is suggested for that specific filter or the water will not be as pure as promised.

Also known as: water filter flow rate, flow rate for water filters

giardia lamblia
Giardia is a common protozoan found in contaminated drinking water. Giardia comes from animal waste and leaches into water. Giardia is contagious and can cause vomiting and diarrhea in individuals who ingest infected water. It is not removed or killed by UV light, iodine or cholorine, and can only be removed by water filters that have a four micron or less rating.

Also known as: Giardia

grains per gallon
‘Grains per gallon’ is the way solid materials in water are measured, and is often used to express the hardness of water, since hard water has a higher prevalence of solids than does soft water. A grain is considered 1/7000 of a pound, or 0.0648 grams. One grain per gallon equals 17.1 parts per million.

Also known as: GPG

All water found in the ground, including subsurface water, well water, aquifer water and deep ground water is known as groundwater.

Also known as: ground water, well water

hard water
Hard water is water that has an abundance of dissolved calcium and magnesium. Hard water causes scale formation in pipes and water heaters, and forms a curd-like substance when it reacts with soap and some detergents. Water hardness is often expressed in grains per gallon, parts per million, milligrams per liter, and calcium carbonate equivalent. Water that has a total hardness of one grain per gallon or more is considered hard water.

Also known as: calcium water, magnesium water

inorganic matter
Inorganic matter is defined as materials not derived from living organisms. Because it was never living, inorganic matter contains no organically produced carbon. Inorganic matter found in water may include rocks, minerals and metals.

Also known as: inorganic contaminants

Iron is a common element dissolved in ground water, and, therefore, drinking water from municipal water supplies and well water. Iron is a problem in drinking water because it tastes badly, can smell bad, may be discolored and can stain fabrics and other materials.

Also known as: ferrous iron, ferric iron, heme iron, ferric hydroxide, iron fouling

Nanofiltration is a membrane water filtration process that treats water between reverse osmosis and ultrafiltration the filtration and separation spectrum. Nanofiltration can remove particles between 300 and 1,000 molecular weight.

Also known as: superfiltration, extra-fine filtration

organic matter
Organic matter in water is materials and derivatives coming from plant and animal matter. Inorganic matter derived from rocks, minerals and other non-living sources. Organic matter can be identified by its carbon-hydrogen structure.

Also known as: organic material

Osmosis is the process of filtering water through a semi-permeable membrane that allows water to run through while capturing most dissolved substances in the water.

Also known as: water filtration by osmosis, osmosis water filters

pH rates the acidity of solutions, including water. Liquids with a pH of 1 are very acidic, those with a pH of 7 are neutral, and a pH of 14 is basic. The pH7 neutral represents a liquid with equal concentrations of free hydrogens and free hydroxide ions.

Also known as: potential of Hydrogen

potable water
Potable water is all water that is deemed safe for human consumption, cooking and household purposes.

Also known as: drinking water, safe drinking water

raw water
Water from wells and other locations before it is treated or processed.

reverse osmosis
Reverse osmosis dissolves ions in water by forcing water through a semi-permeable membrane. This allows water to pass through, but separates out most other suspended and dissolved materials. Reverse osmosis is so named because mechanical pressure is used to force the water to flow in the direction that is the reverse of natural osmosis.

Also known as: reverse osmosis water filtration, RO

A water filtration system that removes small and large contaminants from drinking water. Ultrafiltration is especially useful for water that contains grease, oil or a large amount of suspended solids. This may be done before running water through a reverse osmosis or nanofiltration systems.

Also known as: ultra-filtration, UF, U/F

water conditioning
The treatment of water that improves its quality by removing contaminants and solids, neutralizing acidity and pH, and making it potable and safe.

Also known as: water treatment, water filtration, potable water conditioning

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Frequently Asked Questions

Customers throughout the Bay Area have many questions for local water treatment companies. Some of the most common questions and typical answers are found below. The answers below are likely those you will hear from water filtration experts, but it’s always best to talk with your water treatment service about your specific needs.

Q: Why choose a Diamond Certified water treatment company?
A: Diamond Certified helps you choose a water treatment company with confidence by offering a list of top rated local companies that have passed the country’s most in-depth rating process. Only water treatment company rated Highest in Quality and Helpful Expertise® earn the prestigious Diamond Certified award. Most companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with ongoing research and ratings. And your purchase is backed by the Diamond Certified Performance Guarantee, so you’ll feel confident choosing a Diamond Certified water treatment company.

Q: What is water filtration?
A: Water filtration is the process of removing from water impurities, contaminants, metals and microorganisms. Water purification can be performed through a whole-house water filtration system, sink-mounted water filtration system or other water filtration system. Talk with a local water treatment company about the best method of removing impurities from your water.

Q: Can water purification remove bacteria from drinking water?
A: Yes, water purification and water filtration can remove bacteria from drinking water. This usually is done through water disinfection. Biocides, chlorine, UV light and other methods are used to remove bacteria and other microorganisms.

Q: Can water filtration systems remove phosphates, ammonia, nitrates and fertilizers from drinking water?
A: Water purification systems can remove fertilizers, phosphates, nitrates, ammonia and other contaminants through various methods. This usually includes aerobic and anaerobic methods of removal.

Q: My drinking water isn’t clear—what could that mean and what can I do about it?
A: If you have well water and it’s rust-colored, that probably means you have iron in your water. Water that is tinted black may be contaminated with manganese or sulfur (which smells like rotten eggs). These problems can be remedied with an ion exchange water treatment system. Water with dirt or fine particles of sand or clay may require a coagulation filter system. Talk with your water filtration expert to find out exactly what is in your water and how to treat it.

Q: My drinking water has a bad taste. Can that be fixed?
A: Water that tastes bad may not be dangerous, but can still impact your willingness to use it for drinking and cooking. Reverse osmosis filtration systems can remove particles and taste from your water. Carbon filters can remove chlorine taste from drinking water. You may opt to install a whole house water filtration system or a small filtration system that treats only the water from the kitchen sink.

Q: Is tap water safe to drink?
A: Tap water is tested for contaminants, but that doesn’t mean it is always safe from bacteria, chemicals, leaching heavy metals or other contamination. Tap water also may contain up to a certain level of contaminants that are under a level deemed safe by experts. Local water supplies are often cleaned using chlorine and other chemicals, and many locales add fluoride and other additives that some people may not want. Depending on your city, the water pipes and water filtration system may be worn, old or in need of replacement. The safest way to protect your family from contaminated water is to have an in-home water filtration system.

Q: Is water from reverse osmosis filtration systems better than bottled drinking water?
A: Reverse osmosis filtration systems are multiple-stage water purification systems that completely remove any contaminants from drinking water. Some systems even add minerals to the drinking water to make it taste fresher than bottled water. Reverse osmosis drinking water systems allow homeowners to purify their tap water just before they drink it so it is fresher. And having a water purification system in-home negates the need for buying bottled water for drinking of cooking.

Q: Is reverse osmosis water filtration the most effective way to clean drinking water?
A: Yes, reverse osmosis is considered the most effective way to filter water. Reverse osmosis involves filtering water through a semi-permeable membrane rated at 0.0001 micron. Reverse osmosis filtration is so effective that it can desalinate sea water for drinking purposes, and is the most common method used to purify drinking water.

Q: Are activated carbon cartridges good water filtration systems?
A: Activated carbon water filtration cartridges are less effective than reverse osmosis water filters. They have larger pores within their filters, usually 0.5 to 10 microns compared to 0.0001 micron for reverse osmosis water. This means that activated carbon filters can usually remove larger pieces of sediments, particles and elements. Any finer particles and dissolved materials cannot be filtered out, so some chemicals and elements will remain in the drinking water.

Q: Why would I need an ultraviolet water filtration system?
A: UV light can disinfect filtered water, including removing bacteria, viruses and microorganisms that are destroyed by UV light. Most municipal water supply customers don’t need ultraviolet water filtration because most municipal water supplies are chlorinated, which removes the same microorganisms that are killed by UV light. Customers with well water or those who may have contaminants in their water may want to add UV light filtration to their water.

Q: How do I find out what contaminants are in my drinking water?
A: You can have a water analysis performed and sent in to a state-approved laboratory for testing. You can get more information by contacting the California state health department or the EPA Safe Drinking Water Hotline at (800) 426-4791. You can also buy a home water testing kit, which can test for various contaminants.

Q: How do I know which water filtration system is best for my home?
A: First, you’ll want to know which contaminants are in your water. Then you can find the right water filtration system to rid your water of the harmful contaminants. You can find a number of good systems in stores, via the internet or through local water conditioning companies.

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