Backflow testing in Ontario, CA

Certified backflow prevention assembly testers approved by City of Ontario Utilities. Annual testing is required — find a local pro today.

Now accepting listingsSan Bernardino County, CA

Be the first tester in Ontario

No testers are listed in Ontario yet. Are you a certified tester approved by City of Ontario Utilities? Claim this area and reach local property owners.

Get listed in Ontario

Also based in Ontario — not yet claimed

From water-agency approved-tester lists. Contact details appear once the owner claims and we verify the listing.

OB
Ontario Backflow Co.unclaimed

Ontario, CAListed by City of San Bernardino Municipal Water

Is this your business? Claim this listing →
SM
SM Waterworks Backflow Serviceunclaimed

Ontario, CAListed by City of San Bernardino Municipal Water

Is this your business? Claim this listing →

Backflow testing requirements in Ontario

Property owners in Ontario served by City of Ontario Utilities are required to have their backflow prevention assemblies tested annually. If you've received a testing notice, a certified tester can complete the test and file your results directly with your water agency — keeping your property compliant with no paperwork on your end.

Ontario zip codes served: 91758, 91761, 91762, 91764