Diamond Certified Company Report

Ongaro & Sons

Electrical Contractor, Plumbing & Heating & Air Conditioning

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Ongaro & Sons
305 SURVEYS
11 CONSECUTIVE YEARS
SINCE OCTOBER 2016
CERT 2394

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305
Verified Customers
Surveyed
Customer Loyalty
Customer Satisfaction
Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance

Company Report Menu

  • Survey Responses (reviews)
  • Diamond Certified Video Player
  • Researched Articles & Profile
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Diamond Certified Company Report SUMMARY UPDATE October 2026

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Ongaro & Sons

Rated Highest in Quality and Helpful Expertise for 11 Consecutive Years.

Quick Summary

  • Diamond Certified since 2003
  • Provides plumbing, heating, cooling, and electrical services for residential and commercial clients in Sonoma and Marin Counties
  • Family-owned
  • Member of the Plumbing-Heating-Cooling Contractors Association (PHCC)

Top News Updated

COMPANY MILESTONES

Ongaro & Sons is celebrating its 94th anniversary in 2026.

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AWARDS & RECOGNITION

Ongaro & Sons was recently recognized in the Marin Independent Journal’s Readers’ Choice Awards, earning both “Best Air Conditioning/Heating” and “Best Plumber in Marin County.” The company also received Honor Awards in the Solar Company and Electrician categories.

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Top Survey Responses

From a recent Diamond Certified Survey Response: “They’re the top of the line as far as their service. I’ve known them a long time. They’re a good, honest company and they know what they’re doing.”

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From a recent Diamond Certified Survey Response: “Their prices are reasonable, they come when they say they will, they get the [job] done within the [given] timeframe and everything works well when they leave. I haven’t had any problems and I’ve used them for years.”

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Blogs & Articles

Ongaro & Sons recently published several new blogs on its website, including “How Many Amps Does My House Need? Sizing Service for What You Actually Run” and “Electrical Permit Requirements in California: What Needs One and What Does Not.”

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Ongaro & Sons

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Ongaro & Sons
Electrical Contractor, Plumbing & Heating & Air Conditioning
|
Marin  Sonoma Counties
(707) 652-9891
diamondcertified logo
11 CONSECUTIVE YEARS

Diamond Certified Researched Articles on Ongaro & Sons

researched article

This truck is a replica of Ongaro & Sons’ first service vehicle.

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Ongaro & Sons provides a complete range of plumbing services for residential and commercial clients in Sonoma and Marin Counties. In addition to servicing, repairing and replacing all types of plumbing systems, the family-owned and operated company has the in-house capabilities to install and repair water heaters and HVAC systems, clean and replace sewer lines, install products that improve indoor air quality, and more.

Co-owner Ernie Ongaro says Ongaro & Sons’ customer-oriented business approach has been the key to its 94 years of success. “Since 1932, we’ve been focused on serving our customers, being responsive to their needs and ensuring their satisfaction. We want them to be so happy with our services that they tell their friends and family about us, which is why we have so many second- and third-generation customers.”

Ongaro & Sons makes sure its technicians are comprehensively trained before they start working in the field, which Mr. Ongaro says allows the company to ensure high levels of quality control. “We spend a lot of time and money on training, both in-house and through organizations like PHCC and NATE. It’s important for us to have technicians who know exactly what they’re doing so we can ensure each client gets the best possible value.”

Diamond Certified Researched Capabilities on Ongaro & Sons

Service Area

serving area
Sonoma County
Marin County
Serving Sonoma and Marin Counties

Main Services

Electrical Contractor
  • Ceiling Fan Repair
  • Circuit Breaker Repair
  • Electrical Inspections
  • Electrical Panel Upgrades
  • Electrical Repairs
  • Electrical Services
  • Emergency Electrician
  • Hot Tub Wiring
  • Lighting Repairs
  • Outlet Installations
  • Subpanel Installation
  • Whole Home Surge Protectors
Plumbing
  • Commercial Plumbing
  • Drain Cleaning
  • Emergency Plumber
  • Gas Pipe Repair
  • Leak Detection
  • Plumbing Services
  • Sewer Pipe
  • Toilet Repair
  • Water Heater Installation
  • Water Heater Repair
  • Water Heater Replacement
  • Water Lines
Heating & Air Conditioning
  • Ac Tune Ups
  • Air Conditioner Repair
  • Air Conditioning
  • Commercial Air Conditioning
  • Ductless Heating And Cooling Systems
  • Furnace Repair
  • Heat Pump Repair
  • Heating
  • Hvac Installation
  • Hvac Replacement
  • Mini Splits
  • Water Heater Repair

Additional Services

Plumbing, Heating & Cooling Service
Electrical Service, Repair & Installation
Indoor Air Quality
Water Heater Repair & Replacement
Sewer Cleaning & Replacement

Company Info

Hours
Mon
07:30 am - 05:00 pm
Tue
07:30 am - 05:00 pm
Wed
07:30 am - 05:00 pm
Thu
07:30 am - 05:00 pm
Fri
07:30 am - 05:00 pm
Sat
07:30 am - 01:30 pm
Sun
Closed
Closed
Mon – Fri: 7:30am – 5pm
Sat: 7:30am – 1:30pm
Website
Contact
Ongaro & Sons

Capabilities Table

Company Name
Ongaro & Sons
DCID Number
DCID7075793511
Managers
Ernie, Paul, Dean, Mitch, Ernest and Donald Ongaro, Owners
Years in Industry
89 (Combined)
# of Employees
112
License
215233
Memberships
Better Business Bureau, Plumbers Success International (PSI), Plumbing-Heating-Cooling Contractors Association (PHCC), Sonoma County Chamber of Commerce
Insurance
Liability Insurance,
Workers' Compensation
Founded
1932
Customer Type
Commercial, Residential
Warranties & Guarantees
Lifetime Satisfaction Guarantee on Workmanship, 10-Year Parts & Labor Warranty on HVAC Equipment, 5- to 10-Year Labor Warranty on Water Heater Installations
Payment Accepted
american express,
discover,
mastercard,
visa

Certifications & Awards

Brands

American Standard logoAmerican Standard
Trane logoTrane
Mitsubishi logoMitsubishi

Key Factors

Ongaro & Sons Family Owned
Family Owned
Ongaro & Sons Established in 1932
Established in 1932
Ongaro & Sons Residential & Commercial
Residential & Commercial
Ongaro & Sons Mobile Services Available
Mobile Services Available
Ongaro & Sons Appointments Available
Appointments Available
Ongaro & Sons Live Phone Call Answers
Live Phone Call Answers
Ongaro & Sons Financing Available
Financing Available
Ongaro & Sons Diamond Certified Expert Contributor
Diamond Certified Expert Contributor
Ongaro & Sons Green business Practices
Green business Practices
Ongaro & Sons Workmanship Guaranteed
Workmanship Guaranteed

Select Photos From Ongaro & Sons

1 of 6Picture of This truck is a replica of Ongaro & Sons' first service vehicle. - Ongaro & Sons
This truck is a replica of Ongaro & Sons' first service vehicle.
Picture of This truck is a replica of Ongaro & Sons' first service vehicle. - Ongaro & Sons
Picture of Ongaro & Sons showcases their commitment to quality with an expertly installed sump pump system, illustrating their focus on quality outcomes. An emblem of reliability against a backdrop of green siding. Copyright ©2025 Diamond Certified Resource

 - Ongaro & Sons
Picture of Amidst a suburban backdrop, Ongaro & Sons expertly maneuvers excavation equipment, emphasizing their focus on quality outcomes. This precision and care are why they're top-rated for Quality. Copyright ©2025 Diamond Certified Resource

 - Ongaro & Sons
Picture of In a quiet basement, an Ongaro & Sons technician meticulously installs a tankless water heater, embodying the company's commitment to quality outcomes. Recognized for expertise and quality, Ongaro & Sons ensures efficiency with each project. Copyright ©2025 Diamond Certified Resource

 - Ongaro & Sons
Picture of A dedicated Ongaro & Sons technician skillfully operates a jackhammer to address road maintenance, reflecting the company's focus on quality outcomes. Ongaro & Sons' commitment to craftsmanship consistently earns high customer satisfaction ratings. Copyright ©2025 Diamond Certified Resource

 - Ongaro & Sons
Picture of An antique Ongaro & Sons truck stands proudly amidst modern service vehicles, symbolizing a rich heritage of plumbing excellence since 1932. Recognized for expertise and quality, the company bridges past and present. Copyright ©2025 Diamond Certified Resource

 - Ongaro & Sons

Diamond Certified Expert Contributor Advice & Tips

Ernie Ongaro is a veteran of the plumbing and HVAC industries and president of Ongaro & Sons, a Diamond Certified company. He can be reached at (707) 652-9891 or by email.

Ernie Ongaro is a veteran of the plumbing and HVAC industries and president of Ongaro & Sons, a Diamond Certified company. He can be reached at (707) 652-9891 or by email.

Ernie Ongaro: A Family Dynamic

By James Florence, Diamond Certified Resource Reporter

SANTA ROSA — A third-generation plumbing and HVAC professional, Ernie Ongaro reflects on the longstanding legacy of his family’s business. “My grandfather started Ongaro & Sons in 1932,” he recounts. “All three of his sons followed him in the business, and it was the same way with me, my brother and our two cousins. Now, with my son and nephew joining the company, we’re heading toward our fourth generation of family ownership.”

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Read Full Article - Ernie Ongaro: A Family Dynamic

Ongaro & Sons Website and External Feeds

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FAQs
By Ongaro & Sons

How soon can you start my job?

Can you give me an estimate over the phone?

Do you pull permits?

My toilet randomly turns on and off throughout the day. What’s going on?

My water bill seems unreasonably high. Can you troubleshoot the problem?

Ongaro & Sons Ratings and Survey Responses (reviews)

diamondcertified logo
Ongaro & Sons
305 SURVEYS
  • 4.7
  • star image
  • star image
  • star image
  • star image
  • star image
11 CONSECUTIVE YEARS
SINCE OCTOBER 2016
CERT 2394

Diamond Certified Ratings Dashboard

Customer Satisfaction

Customer Loyalty

Helpful Expertise

Company Credentials

  • Liability Insurance
  • Business Practices
  • Current Complaint File
  • Workers Compensation
  • License Verification
  • Legal & Finance
Ongaro & Sons

Based in Petaluma, CA

4.7 avg. star score from 305 Verified Customer Phone Survey Responses

(Reviews: Scroll down to read them.)

Our surveys of only verified real customers produce the country’s most accurate ratings of local companies. Ongaro & Sons scored Highest in Quality and Helpful Expertise and passed the credential-based checks to earn Diamond Certified.

A Star Equivalent Score is calculated for each verified customer rating by weighting the 1–10 Quality score, the YES/NO Loyalty (intent to return) score and the YES/NO Helpful Expertise score. If Helpful Expertise wasn’t surveyed or didn’t apply, it’s simply not shown.