Backflow testing cost
An annual backflow test costs $30 to $300 per device, about $165 on average. Many cities require yearly testing for irrigation systems, fire lines and some homes. Installing or replacing a backflow preventer costs $200 to $1,000.
Quick answer
$165national average test
Most backflow tests cost $30 to $300 per device. Installing or replacing a backflow preventer typically costs $200 to $1,000, depending on its type and size.
Testing and preventer costs
| Service | Typical cost |
|---|---|
| Backflow test (per device) | $30 – $300 |
| Backflow preventer installation or replacement | $200 – $1,000 |
| Sprinkler system repair | $100 – $400 |
What backflow testing is
A backflow preventer stops dirty water from irrigation systems, pools or boilers from flowing back into the drinking water supply. A certified tester checks the device's valves and pressure. Results are usually filed with your water utility.
When is testing required?
Requirements are set by your water utility or city. Testing is commonly required once a year for lawn irrigation systems, fire sprinkler lines and commercial properties. Your utility usually mails a reminder with the deadline.
How to save
- Ask your utility for a list of certified testers and compare prices.
- Ask whether filing the report with the utility is included.
- Schedule with neighbors; some testers discount several homes on one street.
Frequently asked questions
How often is backflow testing required?
Usually once a year, but your water utility sets the schedule.
Can I test my own backflow preventer?
Generally no. Utilities require a certified backflow tester to perform and file the test.
Sources
Prices are national estimates for 2026 based on published cost surveys and labor data. Your local price can be higher or lower. FairFix Costs is not a plumbing contractor; read our disclaimer.