Backflow Preventer Testing in Utah (Law, Cost, Schedule)
A backflow preventer stops dirty water from flowing backward into your clean drinking water supply. Utah law requires annual testing on most irrigation systems, all commercial properties, and many residential setups. Testing must be done by a Utah DOPL-certified backflow tester, and the results filed with your local water authority. Annual testing is one of the lowest-cost line items on a property; pricing varies by device type and how many you have on the meter.
What Backflow Actually Is
Water normally flows one direction: from the municipal main into your home or business. Backflow is when that direction reverses. It happens two ways.
Backpressure: Downstream pressure exceeds supply pressure. Boilers, pumps, and elevated tanks can push contaminated water back into the supply line.
Backsiphonage: Supply pressure drops and creates a vacuum, siphoning water from downstream sources (a hose in a pool, a chemical mixer, irrigation fertilizer) back into the main.
Either way, what sits downstream ends up upstream. On a home system, that might mean lawn fertilizer in your kitchen sink. On a commercial system, it can mean industrial chemicals entering an entire neighborhood’s water supply. Utah has documented cases where backflow incidents made news.
Who Needs a Backflow Preventer in Utah
Most homes, businesses, and properties with any kind of cross-connection need one. A cross-connection is anywhere your plumbing can touch non-potable water. Common examples:
- Lawn irrigation systems (almost universal in Utah)
- Fire sprinkler systems
- Commercial kitchens with dish washers and pre-rinse sprayers
- Boilers and chilled water systems
- Swimming pools and hot tubs plumbed to the main
- Car washes, laundromats, salons
- Medical, dental, and veterinary offices
- Agricultural and livestock water systems
If you have a sprinkler system in your yard, you almost certainly have a backflow device. It sits in a green or tan plastic box near the house, or on a riser next to the main irrigation valve. Saratoga Springs, Eagle Mountain, Lehi, and most Utah County cities require annual testing on all irrigation backflows.
Types of Backflow Preventers
Different risk levels call for different devices. The most common in our service area:
Pressure Vacuum Breaker (PVB)
Most common on residential irrigation. Installed 12 inches above the highest sprinkler head. One test port. Cheap to test, cheap to replace. Vulnerable to Utah freezing temperatures if not winterized.
Double Check Valve Assembly (DCVA)
Two spring-loaded check valves in series. Used on moderate-hazard applications. Can be installed below ground in a box. Four test ports. More durable than a PVB.
Reduced Pressure Zone (RPZ)
The toughest device, used on high-hazard applications like commercial fire systems, boilers, and irrigation with injected fertilizer. Two check valves plus a relief valve that dumps water if either check fails. Four test ports. Must be installed above ground, above grade, and never in a flood-prone area. Most expensive to test and replace.
Atmospheric Vacuum Breaker (AVB)
Simplest device, used on individual hose connections or fill valves. Usually does not require annual testing.
Utah Law on Testing
Utah Administrative Code R309-305 and the Utah Public Drinking Water Rules require annual testing on all testable backflow devices. The test must be performed by a tester certified by the Utah Department of Professional Licensing (DOPL) and the water authority serving that property.
Testing requirements in practice:
- Annual test every 12 months, not “once a calendar year”
- Results submitted to the water authority within 10 days (each city has its own form and portal)
- If the device fails, it must be repaired or replaced, retested, and re-filed within the water authority’s grace window (usually 30 days)
- Failure to test can result in water service termination, typically with 30 days’ written notice
Your local water authority tracks your devices. If you skip a year, you will receive a notice. Ignore it and they will shut your water off. We see this happen every summer when landlords forget to schedule their rental property irrigation tests.
What the Test Involves
An annual test takes 10 to 20 minutes per device. We shut off the water to the device, hook calibrated gauges to the test ports, and measure pressure differentials across the check valves and relief valve. Pass/fail is recorded on a DOPL-approved form.
What we need on site:
- Access to the device (unlock the box or gate)
- The device serial number (usually on a tag)
- Water shut off for 15 to 20 minutes during the test
- A paid invoice address and the water authority account number if the property owner differs from the resident
After the test, we submit results electronically to your water authority within 24 to 48 hours. You get a copy for your records.
What Shapes the Cost
Annual testing is inexpensive — pricing varies by device type and how many devices are on the meter. Multiple devices at the same address typically come with a discount on the second and third.
What can drive cost up:
- Failed test. If a device fails, it needs repair or replacement before it can be re-tested and re-filed.
- Internal rebuild. A failed PVB or DCVA can sometimes be rebuilt with a seat, spring, and poppet kit rather than fully replaced.
- Full replacement. PVBs are the cheapest to replace, RPZs are the most expensive — and price scales with the device size on commercial RPZs.
- Freeze damage. If your irrigation backflow freezes in November because the system was not drained, the body cracks and the device is done. Replace it before spring startup or your water authority will not certify it.
We give you a flat upfront quote on the test, and a separate quote on any repair or replacement before the work starts.
When to Call a Pro
Only a Utah DOPL-certified backflow tester can perform and file a passing test. Call us for:
- Annual scheduled testing
- New irrigation install that needs initial certification
- Failed test retest and repair
- Winterization damage repair in spring
- Commercial compliance audits
- Rental property testing for out-of-state owners
Our team handles residential irrigation, multi-tenant commercial, and HOA common-area testing across Utah County, Salt Lake County, and the Park City area.
Schedule to Stay Compliant
The smartest approach is a recurring annual appointment in April or May, right before peak irrigation season. That catches freeze damage early, gets the filing done before your water authority sends a notice, and means you are legal all summer. Commercial properties with fire sprinklers usually schedule in the same visit.
If you inherited a commercial property, check the last test date on file with the water authority. Many buyers find out six months in that the previous owner skipped testing for years. We can catch your compliance up in a single visit.
If your backflow device needs an annual test, a repair, or a replacement, call H&M Plumbing at (801) 787-6905 for a flat upfront quote. DOPL-certified backflow tester and licensed master plumber. We test and file same-week across Utah County, Salt Lake County, and the Park City area.