How to Start a Backflow Testing Business (2026 Guide)

A backflow testing business, in short: get certified (ASSE 5110, ABPA, or a state license such as Texas's TCEQ tester license after a 40-hour course), have your test gauge checked for accuracy every year, get on each water utility's tester list, and build an annual retest route. Our worked price is about $160 for a one-off test and $135 on a planned route.

More on this topic: Running a trade business, every guide in one place.

Backflow testing suits a plumbing shop that wants steady work in the slow months. Testable assemblies on commercial buildings, irrigation systems and fire lines have to be tested again every year, the water utility tells the owner when, and the same customer needs you again twelve months later. This guide covers the owner's side: certification, the gauge, the utility rules, pricing and the retest list. The pricing uses the cost method from our plumbing price book guide.

Key takeaways

• Certification depends on where you test. State licenses, ASSE 5110, ABPA and AWWA section programs all exist; check each utility's list.
• Texas requires a TCEQ license: a 40-hour accredited course and the TCEQ exam, per Austin Water.
• California is changing: from July 1, 2027, only ANSI-accredited certifications count under the state handbook.
• Gauges get an accuracy test every year, and TCEQ's report form records the date and serial number.
• Price per assembly from your costs: our example is $160 one-off, $135 on a route, $85 or $70 for each extra assembly.
• The retest list is the business. Track the due date for every assembly and book routes by area.

What does a backflow testing business do?

It tests backflow prevention assemblies once a year, files the results with the water utility, and repairs the ones that fail. Texas's test report form lists the assembly types you'll see: reduced pressure principle (RP), double check valve, their detector versions, pressure vacuum breakers and spill-resistant vacuum breakers. Your customers are the building owners, property managers, schools, restaurants and homeowners with irrigation systems who get a letter from the utility.

Check how each utility in your area runs its program first. Most tell the customer to hire a certified tester, but some do the annual test themselves: Rainbow Water in California performs annual backflow testing and sends a repair letter after a failed test, which the customer then hires a tester to fix. In those areas, the work is repairs, not tests.

How do you become a certified backflow tester?

You complete a tester course and pass a written and practical exam with a program your state or utility accepts. The main routes, as their own pages described them in October 2026:

California's State Water Board says that from July 1, 2026 to June 30, 2027 testers used by public water systems must be certified by a state-recognized organization, and from July 1, 2027 only organizations accredited by ANSI under ISO/IEC 17024. Its August 26, 2026 table lists ABPA and ASSE 5110 as recognized with ANSI accreditation in process, and CA-NV AWWA as accredited. Local rules can be stricter: Walnut Valley Water District says that from July 1, 2026 it accepts only AWWA-certified testers.

Test procedures matter too. TCEQ's form says a Texas tester's license is based on the procedures in the University of Southern California's 10th edition manual, and USC's Foundation for Cross-Connection Control and Hydraulic Research also runs a tester course and publishes a list of approved assemblies.

What equipment and gauge calibration do you need?

You need a differential pressure test kit on the utility's approved list, the fittings and tools to work on each assembly size, and a yearly accuracy test for the gauge. TCEQ's report form says gauges need to be tested for accuracy annually, with that date and the serial number recorded on every report, and that gauges used on potable assemblies must not be used on non-potable ones. Austin also requires calibration by an approved gauge testing company within the USC tolerances, and a gauge registration form unless you use your employer's registered gauges. Keep the calibration certificate with the gauge; a test with an out-of-date gauge can be rejected.

How much should you charge for a backflow test?

Charge per assembly from your own cost per billable hour, with a lower price for each extra assembly at the same site and for tests on a planned route. Our price book example is $174.20 per billable hour at a 50% billable ratio. A route day with eight or ten tests in one area has far less driving, so at a 75% billable ratio the same costs give $146.47 an hour ($41.60 loaded wage ÷ 0.75, plus $91 truck and overhead). Example numbers, at a 30% margin:

The 0.6 hours covers the test, the tag and the report filing. The $5 covers test tags, the gauge's yearly calibration spread over your tests, and printing. If a utility charges a fee to file reports, add it to that utility's price. We couldn't find a dated, published price survey for backflow tests worth quoting, so check what testers on your utilities' lists charge before you publish your prices.

How do you build an annual retest list?

Build it from every assembly you test, keyed to its due date, so next year's work is booked before the utility's letter arrives. TCEQ's form says annual tests of assemblies protecting against health hazards should be no more than 12 months from the last test date, so plan each retest for about month 11. Steps:

1. Record each assembly: address, location on site, type, size, make, model, serial number, the utility and its account or ID number, and the test date.
2. Set the due date at 12 months and the target date at 11.
3. Group by area and month so one route day covers a neighborhood or an office park.
4. Contact the customer about a month ahead with the date, the price and a way to reschedule.
5. Remind them the day before, especially where someone has to unlock a meter box or a mechanical room.
6. After the test, file the report and, for a failed assembly, send the repair price the same day.

Our seasonal maintenance reminder schedule and appointment reminder text templates have wording you can adapt, and dispatching for a small shop covers fitting route days around service calls.

How do you report test results to the water utility?

Report them the way each utility asks, by its deadline, and keep your own copy. Examples:

• Texas: TCEQ's form 20700 is completed for each assembly tested, on site, and a signed original goes to the public water system under 30 TAC 290.44(h)(4)(c), unless TCEQ-approved electronic record keeping is in use.
• Austin: reports are submitted online within five calendar days of the test, and paper copies aren't accepted. Austin says it is moving test submissions to a new system, so check its page for the current one.
• Walnut Valley Water District: the utility sends the customer a letter, and the testing company submits results online through a third-party reporting site the district names.

Learn each utility's portal before your first route day there. A late or rejected report means a second trip, and a customer who gets a past-due letter after paying you.

Where CrewRobin fits

CrewRobin's maintenance plans fit annual retests: set a plan to 1 visit a year and each visit is added as a job 14 days ahead, billed yearly, monthly or per visit. The customer gets a reminder text about a day before and can reply C to confirm or R to reschedule, and the dispatch board lets you drag the month's tests onto the days you've set aside for each area. Put test, extra assembly and repair prices in the price book and invoice from the job with a pay link. CrewRobin doesn't file test reports with water utilities, track gauge calibration or keep an assembly register; record assembly details in the job notes and photos, and submit each report in the utility's own system. See how it works for plumbers.

Frequently asked questions

How do I become a backflow tester?

Take a tester course and pass the written and practical exams with a program your state or utility accepts, such as ASSE 5110, ABPA or an AWWA section program. Texas requires a TCEQ license after a 40-hour accredited course and the TCEQ exam. Then register with each utility that keeps its own list.

How much should I charge for a backflow test?

Price per assembly from your own costs. With our example numbers, a one-off test is about $160, a test on a planned route about $135, and each extra assembly at the same site $70 to $85, at a 30% margin. Check what testers on your utilities' lists charge.

How often do backflow assemblies need testing?

Usually once a year; check each utility's rules for anything stricter. TCEQ's form says annual tests of assemblies protecting against health hazards should be no more than 12 months from the last test date.

How often does a backflow test gauge need calibration?

At least once a year in Texas: TCEQ's report form says gauges need an annual accuracy test, recorded on every report with the serial number. Some utilities, such as Austin, also require an approved gauge testing company.

Is backflow testing a good business for a plumbing company?

It can be steady, repeat work: the same assemblies need testing every year and the utility prompts the customer. It works best when you track due dates and route tests by area, and when you also do the repairs failed tests create.

Put it to work this week

Put every assembly on a yearly plan so next year's backflow tests are on the board before the letters go out. CrewRobin is free until your first 10 booked jobs, no card up front. Start free or see pricing.

Sources

Figures from outside CrewRobin were checked against these pages in October 2026. Most industry benchmarks come from vendors and agencies, so treat them as ranges, not rules.

• Texas Commission on Environmental Quality: Form TCEQ-20700, Backflow prevention assembly test and maintenance report and instructions (checked October 2026)
• City of Austin: Backflow prevention assembly tester information (checked October 2026)
• California State Water Board: Backflow tester and cross-connection control specialist certification (updated June 23, 2025)
• California State Water Board: Backflow assembly tester certifications recognized and accredited (August 26, 2026, PDF)
• IAPMO Backflow Prevention Institute: Course brochure, ASSE 5110 tester training and recertification (2023, PDF)
• USC Foundation for Cross-Connection Control and Hydraulic Research (checked October 2026)
• Walnut Valley Water District: Backflow information (checked October 2026)
• Rainbow Municipal Water District: Backflow testing program (checked October 2026)