DFW Plumbing Code Requirements Every Homeowner Should Know

Texas Plumbing Code: What You Need to Know

Texas plumbing code exists to protect public health and safety. As a DFW homeowner or landlord, here are the code requirements that are most likely to affect you.

Licensed Plumber Required

Texas law requires a licensed plumber for any work that connects to the water supply or drainage system. This includes:

Water heater installation or replacement

Gas line work (any gas appliance connection)

Sewer line repair or replacement

Adding or moving plumbing fixtures

Backflow preventer installation

DIY exception: You can replace a faucet, toilet, or garbage disposal yourself. But any work involving gas lines, water lines inside walls, or drain/sewer lines requires a license.

Water Heater Requirements

**T&P (Temperature & Pressure) valve** — Required on all water heaters. Must discharge to within 6 inches of the floor or to the exterior.

**Expansion tank** — Required in most DFW municipalities when the home has a backflow preventer or pressure reducing valve (closed system).

**Proper venting** — Gas water heaters must be properly vented to the exterior. Carbon monoxide is no joke.

**Drain pan** — Required when installed above living space (second floor, attic).

Backflow Prevention

**Required** for homes with irrigation systems, pools with auto-fill, or any cross-connection to the potable water supply.

**Annual testing** required by most DFW municipalities (Dallas, Fort Worth, Arlington, Plano, Frisco all require it).

**Cost:** Annual backflow test is $89 at DallasPlumber.com.

Smoke and CO Detectors (for Landlords)

Texas Property Code requires:

Working smoke detector in each bedroom and on each level

Landlords must install and test before each new tenancy

Detectors over 10 years old must be replaced

Rental Property Requirements

DFW landlords must ensure:

All plumbing fixtures are functional

Hot water is available (120°F recommended, 140°F maximum)

No active leaks

Sewage properly drains

Working smoke detectors installed

When You Need a Permit

Most DFW cities require permits for:

New water heater installation (yes, even replacements in some cities)

Gas line work

Sewer line replacement

Adding new plumbing fixtures

Repiping

At DallasPlumber.com, we pull all required permits and handle inspections as part of our service. You don't have to deal with city inspectors — we handle it. Call (682) 900-4100 for code-compliant plumbing work.