Cagwin & Dorward, Petaluma, CA: Backflow Testing

Approvals

✓ On the DSRSD list✓ On the City of Milpitas list✓ On the North Marin Water District list✓ On the City of Tracy list✓ On the City of Petaluma list Phone matches its Google profile

DSRSD backflow tester list, as of August 20, 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.
City of Milpitas qualified backflow prevention assembly testers, as of April 30, 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.
North Marin Water District backflow assembly tester list, as of January 20, 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.
City of Tracy approved backflow testers, as of August 19, 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.
City of Petaluma city certified backflow testers, as of March 13, 2025. 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
Paul Schultz
Bryan Guntle

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) 892-7710 Visit website More testers in California

What Cagwin & Dorward's website says

Services listed on Cagwin & Dorward's website, read October 11, 2026: backflow testing. cagwin.com/services/landscape-maintenance

It says	Details	Page
Service area	Roseville, San Ramon, Santa Rosa, Monterey, Modesto and Sacramento	cagwin.com

Read on cagwin.com on October 11, 2026 (4 pages). This is what the business says about itself.

Where you will find Cagwin & Dorward

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

Other backflow testers nearby

Business	Services	Distance
Arolo Company Inc	Backflow Testing	1 mi
Service Plumbing	Backflow Testing	2 mi
Ongaro & Sons	Backflow Testing	3 mi
Scott Cramer Plumbing	Backflow Testing	4 mi
Dolcini Plumbing, Inc	Backflow Testing	4 mi
GAC Plumbing Company	Backflow Testing	4 mi

Questions about Cagwin & Dorward

Is Cagwin & Dorward approved to test backflow assemblies?

Cagwin & Dorward is on the DSRSD list and City of Milpitas list and North Marin Water District list and City of Tracy list and City of Petaluma list, as of August 20, 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 Cagwin & Dorward do?

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

What areas does Cagwin & Dorward serve?

They are based in Petaluma, California, within driving distance of Petaluma, Napa, Santa Rosa, San Rafael, Hercules. Its website names Roseville, San Ramon, Santa Rosa, Monterey, Modesto and Sacramento as areas it serves (read October 11, 2026).

How do I reach Cagwin & Dorward?

Call (415) 892-7710. 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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Cagwin & Dorward