Backflow Prevention Services in Largo, FL

  • Fully Certified, Licensed & Insured
  • Honest Sizing for Your Hazard Level
  • Testing & Utility Filing Handled for You
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Backflow Prevention for Largo Homes and Businesses

Positively Plumbing installs, tests, and repairs backflow preventers across Largo. We handle the assembly, the annual test, and any repair, then file the paperwork the water supplier requires — with a written price before the work starts and no hidden fees. Cross connections can lead to backflow and water contamination, and getting the right device installed and tested is how you prevent it. See our full service list below, or call now for a fast, upfront quote.

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Backflow Prevention testing

Why Backflow Testing Matters: Safety & Compliance

Backflow preventers rely on internal springs and seals that inevitably wear out over time. Because of this, Florida utilities require testing every 1-2 years—especially for properties with pools or irrigation systems—to ensure they still block contamination.

We test your system’s valves with calibrated gauges to confirm they meet protocol. If your assembly passes, we file the paperwork directly with your water supplier. If it fails, we tell you exactly why and quote the repair upfront. Don’t risk a utility shut-off or liability issues—let us handle your compliance from start to finish.

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Our Comprehensive Backflow Services

Complete testing, repair, and installation services to protect your water supply and keep the utility company happy.

Backflow Testing & Certification

Annual or biennial testing on your RPZ, PVB, or double check assembly, with results filed to your water supplier. We test to protocol and give you a straight pass/fail, with any repair quoted in writing.

Backflow Preventer Installation

New installation sized to the hazard and the cross connection — irrigation, pool fill, boiler, or commercial connection — installed to plumbing codes with the proper shutoff valves and clearances.

Backflow Repair & Rebuild

When an assembly fails a test, we rebuild or replace the failed check valve, relief valve, or seals and retest to confirm it holds. Often a rebuild costs far less than a full replacement.

Cross-Connection Control

Assessment of where a cross-connection puts your potable water at risk, and the right device to provide maximum protection — physical separation between drinking water and any non-potable water system.

Our Backflow Testing and Repair Process

Certified annual testing, filed with your water authority, on residential and commercial properties. Here’s how a visit runs.

Step 01

Locating and Inspecting the Backflow Device

We find the assembly, confirm the model and serial number against your water authority’s records, and inspect it for corrosion, freeze damage, and leaks. Access matters here — an assembly buried behind landscaping or blocked by storage adds time, so clearing it before we arrive keeps the visit short.

Step 02

Certified Backflow Testing

A certified tester shuts the assembly down and runs the pressure differential test on each check valve and relief valve. Florida requires state-certified technicians to perform this work for county compliance, and testing done by anyone else doesn’t count toward your annual requirement.

Step 03

Necessary Repairs When a Device Fails

Worn check valve springs, fouled seats, and failed relief valves are the common failures, and most get rebuilt on site with a kit. We give you honest recommendations on repair versus replacement, then retest — a backflow assembly only passes once it holds pressure in one direction with no leak-by.

Step 04

Filing Results and Setting Your Next Test

We file passing results with the water authority so your compliance is on record, and we send a reminder before next year’s test comes due. Missed annual testing draws fines in most jurisdictions, and the reminder is what keeps that off your desk.

Why Pinellas County Property Owners Choose Positively Plumbing

Right Device for the Hazard

We match the backflow preventer to the actual cross-connection and hazard level — not the most expensive assembly on the shelf.

Testing, Filing, and Repair Under One Roof

We test, file with the water supplier, and repair or rebuild if it fails — one call handles the whole compliance cycle.

Upfront Pricing in Writing

The test, any repairs, and installation costs are spelled out before we start. No hourly meter, no surprise add-ons on the invoice.

Family-Owned and Locally Operated

A Largo-based company that values community and personalized service. Kevin runs the trucks, so the plumber who installs your device is the same one who tests it next year.

Licensed and Insured Professionals

Fully licensed and insured, carrying general liability and workers’ compensation. All systems are installed and tested to plumbing codes the first time.

Service Areas

We provide backflow prevention, testing, and drain cleaning plumbing services across Largo, Clearwater,
Pinellas Park, and communities throughout the greater Tampa Bay area.

Largo
Ridgecrest
Belleair Bluffs
Belleair
Seminole
Harbor Bluffs
Indian Rocks Beach
Belleair Beach
Clearwater
Bardmoor
Belleair Shore
Indian Shores
Redington Shores
Madeira Beach
Redington Beach
Feather Sound
N. Redington Beach

Not sure if you’re in our service area? Call (727) 625-0603 — we’ll tell you straight.

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Frequently Asked Questions

They let water move in one direction and physically block it from moving the other.

Inside the assembly, spring-loaded check valves sit in the line and stay open under normal flow. When pressure reverses — suction from a main break pulling backward, or downstream pressure from a pump pushing against supply — those springs snap the valves shut and seal the line.

Higher-hazard devices add a relief valve between two checks that dumps water to the ground if both fail, so the contaminated side never reaches the potable side even in a double failure.

That’s why the springs and seats are what get tested annually. They’re the only moving parts standing between your drinking water and whatever the cross connection is attached to, and they wear.

Both. Backflow happens through a cross connection when pressure reverses, and there are two ways that pressure reverses.

Back siphonage is negative pressure in the water main. A main break, a heavy fire-hydrant draw, or any event that drops supply pressure creates suction — the same effect as drinking through a straw — and that suction pulls water backward through the connection. Non-potable water from an irrigation line or a boiler gets siphoned into the potable supply.

Back pressure is the opposite direction. Downstream pressure climbs higher than the supply side, usually from pumps, boilers, or a pressurized system, and pushes water backward against normal flow. When downstream pressure exceeds what the water main delivers, water reverses through the cross connection.

Either way, the fix is the same: a backflow preventer sized to the hazard, installed at the cross connection.

Five, and the right one depends on the hazard level and whether you need protection from back siphonage, back pressure, or both.

  • Air gap: a physical vertical separation between the supply outlet and the rim of the receiving vessel, at least twice the supply pipe diameter and never under one inch. No moving parts, so nothing fails. It’s the most effective method there is, but it breaks the pressurized line, which rules it out for most connections.
  • Reduced pressure zone assembly (RPZ): two independent spring-loaded check valves with a pressure differential relief valve between them, plus shutoffs and test cocks. Protects against both back pressure and back siphonage, and it’s mandatory for high-hazard applications: medical facilities, boilers, chemical connections.
  • Pressure vacuum breaker (PVB): a spring-loaded check valve and an air inlet valve with shutoffs and test cocks. Handles back siphonage only, so it goes where downstream pressure won’t exceed supply. Common on residential irrigation.
  • Double check valve assembly (DCV): two spring-loaded check valves in series. Used on low-hazard, non-health cross connections that need physical separation between a non-potable system and the potable line.
  • Atmospheric vacuum breaker: the simplest and least expensive option, limited to low-hazard use. Installation restrictions apply: no shutoff valve downstream, and it can’t sit under continuous pressure.

Any property with a connection between the potable supply and a non-potable source. In Florida, that covers more homes than most people expect.

  • Homes with irrigation systems: required by Florida code since 1990. If your sprinklers tie into the house supply, the device isn’t optional.
  • Homes with pools: Florida requires backflow protection wherever a pool fill line connects to the potable supply.
  • Properties with wells or reclaimed water: any auxiliary, non-potable source running near the potable system creates the cross-connection the device exists to protect.
  • Commercial buildings: restaurants, medical facilities, and any business with boilers, chemical connections, or process water.
  • Fire suppression systems: additives and standing water in the lines can reverse into the supply without one.

Annually in most jurisdictions, and Florida counties enforce it. Local codes and your water authority set the exact requirement, and failure to test on schedule brings fines and, in some cases, water service interruption.

Regular testing is also what catches a failing assembly before it fails outright, which is the practical reason to keep it on the calendar rather than the compliance one.

The barrier between your drinking water supply and whatever sits on the other side of the cross–connection stops working. Contaminated water from irrigation lines, fire sprinklers, or process water can move the wrong direction into the potable system, which is a real health hazard rather than a paperwork problem.

A strange taste or discoloration at the tap is a late signal — by the time you notice, water has already flowed backward. A failed device gets repaired or replaced before the assembly returns to service.

Get Your Backflow Testing or Installation Estimate Today!

Need a backflow test, a new preventer, or a repair? Contact Positively Plumbing today for straight answers and a written estimate. We handle the test, the filing, and any repair — so you stay compliant, and your drinking water stays clean.

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