Backflow Testing & Prevention in Alpharetta, GA
Fulton County requires annual backflow testing on every residential irrigation system. We send a certified backflow tester, run the test, submit results to the utility on your behalf, and repair on the same visit if the device fails. Call to schedule.
If your Alpharetta home has an in-ground irrigation system, you are subject to annual backflow testing under Fulton County's cross-connection control program. The test verifies that your backflow preventer — the device that keeps lawn water from siphoning back into your drinking water supply — is functioning correctly. The test costs less than the fine for non-compliance, and we handle the paperwork end so you don't have to.
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What backflow is, why it matters, and what gets tested
Backflow is exactly what it sounds like: water flowing backward through a system, against the direction it was intended to flow. In a residential plumbing context, the concern is that contaminated water from an outside source — an irrigation line that has fertilizer or lawn chemicals in it, a swimming pool, a fire-sprinkler system, a boiler — could siphon back into the household drinking water supply when there's a sudden pressure drop in the municipal main.
The pressure drop scenarios that drive backflow events are common: a nearby water main break, hydrant operation during a fire response, even a heavy water-use event in your neighborhood. When mainline pressure falls below internal household pressure, water reverses direction.
The defense against this is a backflow preventer — a one-way valve assembly installed at the point where your irrigation system (or pool fill line, or fire sprinkler feed) connects to your home's potable water supply. Two common types you'll see in Alpharetta residential settings:
- Double-check valve assembly (DCVA). Two independently-acting check valves in series. Used for low-hazard cross-connections — typical residential irrigation.
- Reduced-pressure zone (RPZ) assembly. Two check valves plus a pressure-differential relief valve in between. Higher-hazard cross-connections — irrigation systems with chemical injection, some larger residential systems.
Both types require annual testing because the check valves and relief mechanisms wear over time and can fail without any visible external sign.
How the test actually works
A backflow test is a quick, equipment-intensive procedure. Here's what we do when we show up:
1. Locate and identify your device. We need the make, model, and serial number for the test report. On most Alpharetta installations the device is in a green plastic box at grade near your irrigation manifold.
2. Attach a calibrated differential pressure gauge kit to the test cocks on the device. This is the same instrument used by every certified tester in the state, and it has to be recalibrated annually.
3. Open and close specific test cocks in a defined sequence to check that each check valve holds against pressure and that the relief valve (on RPZ devices) opens at the correct differential.
4. Record readings, sign and date the report, and submit it electronically to Fulton County's cross-connection control program on your behalf. You get a copy for your records.
The whole on-site visit takes about 15 to 20 minutes for a passing device. If the device fails, we'll show you the readings, walk you through the repair options, and (in most cases) repair or rebuild it on the same visit.
Common failure modes and repair scope
Backflow devices fail in predictable ways. Most common: a worn check valve disc or seat that no longer holds pressure. Second most common: a stuck or sluggish relief valve on an RPZ. Third: physical damage from freezing — Alpharetta's December–February freeze risk is real, and devices that weren't winterized properly can crack internally without any visible exterior damage.
Repair scope ranges from a quick disc-and-spring replacement (often same-visit) to a full device replacement (when the body is cracked or corroded). On replacements we use the same brand and model where possible to keep the existing irrigation plumbing intact.
If a failed device threatens immediate cross-connection contamination — for example, a chemical injector tied into your irrigation feed — Fulton County requires the device be repaired or replaced before the irrigation system is restored to service. We can prioritize same-day if needed.
Fulton County's specific requirements
Fulton County's cross-connection control program requires annual testing on residential irrigation systems, with the test performed by a Georgia-certified backflow tester. Results must be submitted to the utility — homeowner self-reports aren't accepted; the test report has to come from a certified tester's submission.
If your test is overdue or your device fails and isn't repaired or replaced, the utility can require you to shut down your irrigation system until compliance is restored. For larger residential properties with multiple devices (some Windward and Halcyon estates have separate fire sprinkler backflow assemblies in addition to irrigation), every device needs its own annual test.
We track our customers' test anniversaries and reach out the month before yours comes due. If you're new to us and unsure whether your irrigation system has a working backflow preventer at all, we can do a quick site survey to confirm — Alpharetta's older subdivisions sometimes have irrigation systems that pre-date the current cross-connection requirements and never had a device installed in the first place.
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Frequently asked
Do I really need an annual test?
Yes, if your Alpharetta home has an in-ground irrigation system that's connected to your potable water supply. Fulton County's cross-connection control program requires annual testing by a certified tester, with results submitted to the utility. Properties without irrigation generally don't need it — but if you have an outdoor pool fill, fire sprinkler, or hose-bib vacuum breaker that's part of a permanently-installed system, those have their own testing requirements.
What happens if I skip it?
Fulton County can require you to shut down the cross-connected system (most commonly, your irrigation) until compliance is restored, and depending on the situation can issue penalties. The practical risk is bigger though — an untested device that's silently failed leaves your drinking water at risk of contamination from your own lawn chemicals during the next pressure drop event.
How long does the test take?
About 15 to 20 minutes on-site for a passing device. Failed devices take longer because we'll usually offer to repair on the same visit if you authorize it — that can add 30 to 90 minutes depending on what needs to be replaced.
What's the difference between DCVA and RPZ?
Both are backflow preventers but they're rated for different hazard levels. A double-check valve assembly (DCVA) is the typical residential irrigation device. An RPZ (reduced-pressure zone) device is rated for higher-hazard cross-connections like irrigation with chemical injection. RPZ devices have a relief valve that opens to atmosphere if both check valves fail simultaneously — that's the extra safety layer.
Can I test it myself?
No. Backflow testing requires a calibrated differential pressure gauge kit and a Georgia state certification to interpret and report the results. Even if you have the equipment, the test report has to be submitted by a certified tester for Fulton County to accept it.