Serving 12 Cities Across the Ontario Area
Ontario Backflow Tests is based in Ontario, CA and serves residential, commercial, and industrial properties throughout San Bernardino and Los Angeles Counties — available 24/7.
Click on any city to see available services. All services include direct test report filing with your local water district.
Upland, CA
Montclair, CA
Chino, CA
Rancho Cucamonga, CA
Pomona, CA
Claremont, CA
Chino Hills, CA
La Verne, CA
Diamond Bar, CA
Fontana, CA
Rialto, CA
San Dimas, CA
Services Available in All Cities
Backflow Testing
Annual certified backflow testing required by California law. We test your assembly, certify results, and file directly with your water district.
Learn More →Backflow Repair
On-site backflow repair when your device fails inspection. We carry parts for all major brands and retest on the same visit.
Learn More →Backflow Installation
Professional installation of new backflow prevention assemblies for residential, commercial, and industrial properties.
Learn More →Backflow Replacement
Full replacement of aging or failed backflow prevention devices. We remove, install, test, and file all paperwork.
Learn More →Annual Compliance Management
We track your annual testing deadlines, schedule appointments, and file reports — so your properties stay compliant year after year.
Learn More →Don't See Your City?
We may still be able to help. Call 909-787-1122 to ask about service availability in your area.
909-787-1122Schedule Service
Available 24/7 across all 12 service cities.