Backflow Testing, Certification and Prevention

Your home’s water supply is designed to flow one direction: from the utility main into your house. Backflow is what happens when that flow reverses and water from irrigation lines, boilers, chemical feeders or other equipment gets pulled or pushed back into the drinking water supply. K&K Plumbing provides backflow testing and certification, along with repair and installation of prevention devices, for homes and businesses across Central Florida.

How backflow happens

There are two ways water can reverse.

Backsiphonage happens when pressure in the public main drops suddenly, from a water main break or heavy firefighting demand, for example. That pressure drop can draw water backward out of your property, much like sipping through a straw. A garden hose left in a bucket of fertilizer is a classic example of how contaminants could be pulled in.

Backpressure happens when the pressure on your side exceeds the supply pressure, such as from a pump or a pressurized system, pushing water back toward the main.

A properly working backflow preventer blocks both.

Common types of devices

• Reduced pressure zone (RPZ) assembly. The highest level of protection, used where contamination would be a health hazard. Common on commercial properties and some irrigation systems with fertilizer injection.
• Double check valve assembly. Two independent check valves in series, often used on fire lines and some irrigation systems.
• Pressure vacuum breaker (PVB). Frequently installed on residential irrigation systems, mounted above the highest sprinkler head.
• Hose bib vacuum breaker. A small, inexpensive device on outdoor faucets that prevents siphoning through a hose.

What happens during a test

1. We confirm the device type, size and location, and note the serial number for your records.
2. Calibrated test gauges are connected to the assembly’s test cocks.
3. The technician checks each check valve and relief valve against required pressure differentials.
4. Results are recorded, and if the assembly passes, you receive the documentation your water provider requires.
5. If it fails, we explain why and quote the repair before doing it.

Water is usually off for a short period during testing, so plan to avoid running sprinklers or appliances while we’re there.

Repairs and new installations

Most failures come down to worn rubber checks, weak springs, or debris lodged in a seat. We rebuild assemblies with repair kits when that’s practical and replace devices that are cracked, freeze-damaged, or too old to service. When a property adds irrigation, a pool fill line, a boiler, or commercial equipment, we install the appropriate device and size it correctly. If a city inspection or citation flagged a missing or incorrect device, our code violation repair service covers that too.

Florida considerations

Irrigation is everywhere here, and many neighborhoods use reclaimed water for lawns, which makes cross-connection protection especially important. Above-ground assemblies sit in full sun and occasionally face a hard freeze; an insulated cover helps, and a cracked body after a cold snap is one of the most common failures we see. Many Florida utilities require annual testing and track due dates, so the reminder letter in your mailbox is your cue to schedule. Our article on why backflow testing matters explains more for homeowners.

Signs a device needs attention between tests

You don’t have to wait for the annual test to spot trouble. Call us if you notice any of the following:

• Water dripping or discharging from the relief port of an RPZ assembly
• A cracked or bulging body after a cold night
• Sprinklers with noticeably weaker coverage than they had last season
• A test cock or valve handle that is leaking or broken
• A device that has been bumped by a mower or vehicle

Continuous discharge from an RPZ is the device doing its job by dumping water rather than letting it reverse, but it also means something inside isn’t sealing. If your tap water ever looks or smells unusual after a main break nearby, contact your water utility first, then have your assembly checked.

Residential and commercial testing

We test single-family irrigation devices, HOA common-area assemblies, restaurants, offices and multi-unit buildings. Businesses with several devices can bundle testing into one visit as part of our commercial plumbing work. We serve customers in Oxford, Lake Panasoffkee and the rest of our eight-county area.

Keep your water safe and your account current

If you’ve received a testing notice, or you’re not sure whether your property has a backflow device at all, give us a call. Phone or text 352-810-9472 and K&K Plumbing will schedule your test and take care of the report.