• irrigation water supply
  • domestic water supply

We're a full-service backflow solution. no matter how small or how large your backflow problem, we've got a fix for you.


After more than three decades of servicing four counties backflow needs, we're proud to say Terry's Testing is at your service day or night. We have experienced technicians on-call 24/7 because no one decides when they have a backflow problem. From routine maintenance to stolen backflow, we're here to help.


Leaks? No problem.

  • industrial water supply
  • fireline Water Supply

Backflow Repairs


35 years of experience testing and repairing backflow devices.



Qualified technicians with years of experience installing and replacing backflow devices of every size. 

Backflow Testing


We provide backflow testing for Orange, Los Angeles, Riverside and San Bernardino counties

Commercial - Residential Services

Backflow Leaking


24 hour emergency repair service for leaking backflow devices if necessary.

Professional Backflow Testing Company