How Much to Charge for Backflow Testing
Backflow testing typically runs $75–$150 per device for residential and small commercial assemblies, rising to $150–$300 for large-diameter or fire-line assemblies, with most testers holding a $100–$150 site minimum. Repairs add $75–$150 per hour plus a repair kit, retests run $25–$75 when billed separately, and the water authority's filing fee is passed through at cost.
Test rates by assembly
- Residential irrigation / small commercial (¾”–2”) — $75–$150
- Larger commercial (2½”–4”) — $150–$250
- Fire line / large diameter (6”+) — $200–$300+
- Additional device, same address — $40–$100
- Site minimum — $100–$150
Everything after the test
- Repair labor — $75–$150/hr, or flat by assembly type
- Repair kit / parts — at listed price
- Retest — $25–$75, or bundled with your own repair
- Water authority filing fee — pass-through at cost
- Vault or confined space entry — $50–$100
- After-hours / shutdown window — premium rate
- Emergency or same-day — its own rate
Price the route, not the test
Backflow is really a density business. Cluster your annuals by geography and month, and the per-device rate stops being the number that decides whether the day was profitable.
A stated site minimum is what protects the single-device stops that don’t fit the cluster.
The repair is where the money is
A pass takes fifteen minutes. A failure means labor, a kit, and a retest — often three to four times the test fee. Carry common kits on the truck so the repair happens on the same visit, because a second trip just erases the margin you found.
Raise annually, in writing, before you schedule
Compliance customers rarely shop for a new tester over a modest increase, since re-establishing the account with someone new costs them more than your raise does. Send the rate, then book the date.
Frequently asked questions
Why do multi-device properties cost less per device?
Because the drive, setup, and paperwork happen once. Discount the second and subsequent assemblies at the same address — never across separate addresses, where each one is a full trip.
Should I charge for a failed test?
Yes. You performed the test, the gauge told the truth, and the failure is the customer's device — not your error. Bill the test and quote the repair; testers who eat failures end up subsidizing the worst-maintained properties on their route.
How should repairs be priced?
Hourly labor plus the kit, or a flat rate per assembly type once you've done enough of them to know the time. Flat rates sell better on the spot, which matters because the approval you want is the one you get before you leave.
How do I keep a route profitable in a low-price market?
Density and speed, not undercutting. A tester doing eight tests within four miles beats one doing five spread across a county at a higher rate — and the second tester is the one who ends up cutting price.