Cornely Company, San Francisco, CA: Backflow Testing

Approvals

✓ On the San Francisco authorized testers Phone matches its Google profile

San Francisco authorized backflow assembly testing companies, as of August 14, 2026. Being on this list means the utility lets the company file backflow test reports in its water system; it is not a state license.

Certified tester	Certificate
John Benett

Ask for the certificate number of the tester who will do your test, and check that your own water utility accepts reports from this company.

Call (415) 252-1800 Visit website More testers in California

Price reports

What a backflow test costs in San Francisco

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Published prices nationwide

$29.99 to $100 per assembly

$0$25$50$75$100$125

Based on 14 published prices · Read Oct 2026 Prices testing businesses list on their own websites, from our cost guide. Listed prices, not what people paid.

Every published price, with its source: what a backflow test costs.

Failed test? Published repair, rebuild and replacement prices: what a backflow repair or replacement costs.

Where you will find Cornely Company

These are the city pages close enough for this business to appear on.

Other backflow testers nearby

Business	Services	Distance
Larratt Bros Plumbing, Inc.	Backflow Testing	under 1 mi
Ros Plumbing	Backflow Testing	under 1 mi
Arch Plumbing Inc	Backflow Testing	under 1 mi
Malcolm Plumbing & Mechanical	Backflow Testing	1 mi
Bay Area Mechanical and Engineering, Inc.	Backflow Testing	1 mi
Pacific Automatic Sprinkler Co.	Backflow Testing	1 mi

Questions about Cornely Company

Is Cornely Company approved to test backflow assemblies?

Cornely Company is on the San Francisco authorized testers, as of August 14, 2026. That means the utility lets the company file backflow test reports in its system; it is not a state license. Ask for the tester's certificate number before the test.

What does Cornely Company do?

Their listing covers backflow testing. Call to confirm the service you need, because offerings change.

What areas does Cornely Company serve?

They are based in San Francisco, California, within driving distance of San Francisco, South San Francisco, Oakland, Burlingame, San Leandro. Service areas are set by the business, so confirm yours when you call.

How do I reach Cornely Company?

Call (415) 252-1800. Their website is linked on this page.

Compiled from public records and public business information. Not an endorsement. Check licensing before you hire.

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