Ongaro & Sons

Diamond Certified Company Report
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Ongaro & Sons
278 SURVEYS
10 CONSECUTIVE YEARS
SINCE OCTOBER 2016
CERT 2394

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278
Verified Customers
Surveyed
Customer Loyalty
Customer Satisfaction
Helpful Expertise

Company Credentials

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

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  • Survey Responses (reviews)
  • Diamond Certified Video Player
  • Researched Articles & Profile
  • Capabilities
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Diamond Certified Company Report SUMMARY UPDATE October 2025

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Ongaro & Sons

Rated Highest in Quality and Helpful Expertise for 10 Consecutive Years.

Quick Summary

  • Diamond Certified since 2016
  • Provides plumbing, HVAC, and electrical services for residential and commercial clients in Sonoma and Marin Counties
  • NATE Certified Technicians and PHCC Certified Journeylevel Plumbers
  • Family-owned

Top News Updated

COMPANY MILESTONES

Ongaro & Sons is celebrating its 93rd anniversary in 2025.

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NEW PRODUCTS & SERVICES

Ongaro & Sons now provides instant on-screen estimates via its website.

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Top Survey Responses

From a recent Diamond Certified Survey Response: “I would highly recommend them. We signed up for the yearly maintenance and they always remember to contact us. They’re just so smart and sensible. I can’t say enough about [their] service.”

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From a recent Diamond Certified Survey Response: “They’re always on time and their workers are professional and friendly. My father built this house in the 1950s and we’ve used them ever since. They always do a good job.”

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Awards & Recognition

Ongaro & Sons recently won a Best of Marin 2025 award from Pacific Sun in the “Best Heating & Air Conditioning Service” category.

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Ongaro & Sons
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Ongaro & Sons

Electrical Contractor, Plumbing & Heating & Air Conditioning
|
Marin  Sonoma Counties
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278 SURVEYS
10 CONSECUTIVE YEARS
SINCE OCTOBER 2016
CERT 2394

Rated Highest in Quality & Helpful Expertise Performance Guaranteed

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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 93 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

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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
Contact
Ongaro & Sons

Capabilities Table

Company Name
Ongaro & Sons
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
Founded
1932
Payment Accepted
american express,
discover,
mastercard,
visa

Key Factors

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.”<...

Read Full Article - Ernie Ongaro: A Family Dynamic

Ongaro & Sons Website and External Feeds

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Ongaro & Sons Ratings and Survey Responses (reviews)

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Ongaro & Sons
278 SURVEYS
  • 4.7
  • star image
  • star image
  • star image
  • star image
  • star image
10 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 278 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.