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How to Choose a Plumber in Texas: The RMP Rule, Slab Leaks, and What Metro Prices Look Like

How to choose a plumber in Texas: verify the RMP number, ask about insurance, find someone who knows slab leaks and freeze protection, and compare metro prices.

How to Choose a Plumber in Texas: The RMP Rule, Slab Leaks, and What Metro Prices Look Like

Every licensed plumbing company in Texas has one number that matters more than its phone number: the Responsible Master Plumber license, which state law requires to appear on every truck, every estimate, and every invoice. Look for it before anything else. The Texas State Board of Plumbing Examiners issues it, the board's website lets you verify it in seconds, and a company that cannot show you one is not legally operating as a plumbing contractor in the state.

The February 2021 freeze taught Texas homeowners what happens when plumbing goes wrong at scale. Hundreds of thousands of pipes burst from Amarillo to Houston, and in the weeks that followed, unlicensed crews and out-of-state operators charged whatever they wanted for repairs that often failed within a year. The homeowners who came out best were the ones who already had a licensed plumber they trusted and knew how to check a credential.

Texas plumbing has its own physics. Nearly every home built since the 1960s sits on a slab foundation, and the clay soils under Dallas, Fort Worth, Houston, and San Antonio expand and contract enough to crack pipes running through the concrete. Water across most of the state is hard.

Summer heat degrades exterior PVC and cooks water heaters in unconditioned garages. A plumber who understands these conditions saves you money before the first wrench turns.

How Texas Licenses Plumbers

The State Board of Plumbing Examiners issues four main licenses. A Tradesman Plumber-Limited can do residential work under supervision. A Journeyman Plumber has passed a full exam and can work independently under a master.

A Master Plumber has additional experience and a second exam. A Responsible Master Plumber is a master who has registered to own or operate a plumbing business and carries the insurance the state requires.

Only an RMP can run a plumbing company, pull permits, and advertise plumbing services. The RMP number, formatted as M-followed by digits, has to be on the company's vehicles and paperwork. When you search the number on the board's website, you see the license status, the company name it is tied to, and any disciplinary history.

The technician at your door will usually be a journeyman or tradesman working under the RMP, which is legal and normal. Ask for their license too. Every licensed plumber in Texas carries a card, and a technician who does not have one is either an apprentice who should be supervised or someone who should not be there.

Endorsements That Matter

Texas issues endorsements for medical gas, multipurpose residential fire sprinklers, and water supply protection specialist work. For most homeowners, none of these come up. Gas work, however, is within the scope of a licensed plumber in Texas, so a plumber replacing a gas water heater or running a line to a new range does not need a separate credential.

What does matter is the gas pressure test. Texas cities require one after any gas line work, and the utility will not restore service without a passed inspection. A plumber who has done gas work in your city knows the process and builds it into the schedule.

Insurance the State Requires and Insurance You Should Ask For

Texas requires every RMP to carry general liability insurance of at least $300,000 per occurrence and $600,000 aggregate to hold the license. That is the floor, and it is lower than the value of many homes. Ask for a certificate of insurance and see whether the company carries more, since $1 million is common among established firms.

Workers' compensation is not mandatory for private employers in Texas, which is unusual, and many plumbing companies opt out. Ask directly. A plumber who is injured in your home without workers' comp coverage may have a claim against you, and a company that carries it is telling you how it treats its people.

What a Texas Plumber Should Know About Your House

Slab leaks are the defining Texas plumbing problem. Copper or galvanized lines run under the concrete corrode, and the expansive clay soils in North Texas, Central Texas, and the Houston area shift enough to crack them.

Signs include a warm spot on the floor, a water bill that jumps, the sound of running water when nothing is on, or cracks in the slab. A Texas plumber should have electronic leak detection equipment and should explain both repair options: a spot repair through the slab, at $1,500 to $4,000, or a reroute through the attic, at $4,000 to $12,000 depending on the house.

Water heaters in Texas are often in the garage or attic, and both locations have code requirements for pans, drain lines, and in attics, access and platforms. A plumber replacing an attic water heater in Plano or Katy should mention the pan and drain line without being asked, and should be able to explain why a tankless unit might or might not make sense given the gas line size.

Hard water covers most of the state. San Antonio, Austin, and the Hill Country sit on limestone, and Dallas and Fort Worth draw from reservoirs with high mineral content.

Scale shortens water heater life and clogs fixtures, and plumbers in these markets install softeners routinely. A good one tests your water before recommending equipment.

Freeze Protection After 2021

Texas homes were built for heat, not cold, and the 2021 event exposed that. Pipes in attics, exterior walls, and garages froze across the state.

A Texas plumber worth hiring will identify the vulnerable runs during any service visit and suggest pipe insulation, frost-proof hose bibs, and a plan for the next hard freeze. If the answer is a shrug, keep calling.

Getting Quotes Across Texas Metros

Texas is too big for one price. Hourly rates for licensed plumbers run $95 to $175 in Austin and the Dallas suburbs, $85 to $160 in Houston and San Antonio, and $75 to $130 in El Paso, Lubbock, Corpus Christi, and the Rio Grande Valley. Most large companies now quote flat rates per job from a price book, and diagnostic or trip fees run $49 to $129.

A 50-gallon gas water heater installed costs roughly $1,500 to $2,900 in Austin and Dallas, and $1,300 to $2,500 in Houston, San Antonio, and smaller markets. A whole-house PEX repipe of a 2,000 square foot home runs $5,000 to $13,000.

Sewer line replacement costs $4,000 to $15,000 depending on length, depth, and method. All of these figures are approximate.

Get three itemized written estimates for anything over $500. The spread on a water heater in Frisco or Sugar Land is often $800 between the lowest and highest bid, and the difference is usually the permit, the pan and drain, the expansion tank, and the labor warranty. A quote without those line items cannot be compared to one with them.

Permits and Inspections in Texas Cities

Houston, Dallas, Fort Worth, Austin, San Antonio, and nearly every suburb require permits for water heater replacement, repiping, sewer and water service work, and new fixtures that alter the drain layout. Fees run $50 to $250. The RMP pulls the permit and schedules the inspection, and the fee should appear on the estimate.

Unincorporated areas in many Texas counties have no plumbing inspection, which puts the burden on you. The state license still applies, and the plumber should still work to the code adopted by the state, but nobody will check unless you do.

Red Flags and Where to Find Good Plumbers

No RMP number on the truck or the paperwork is the first and simplest red flag. Others include full payment demanded up front, a firm price quoted over the phone for a job nobody has seen, a technician who recommends a $12,000 repipe without a pressure test or camera inspection, and pressure to decide within the hour. A deposit of 10% to 30% on large jobs is normal, and the balance should be due after inspection.

Neighbors in the same subdivision are the best referral source in Texas, since they share the same slab, the same soil, and the same builder's plumbing. Home inspectors and real estate agents see hundreds of houses and know who does good work. Local online groups in Round Rock, The Woodlands, or Alamo Heights produce names quickly.

Verify every referral on the state board's website before calling. The plumbers listed in our Texas directory include RMP information and service areas, and related home repair guides for Houston, Dallas, Austin, and San Antonio are collected on our blog.

Frequently Asked Questions

What is an RMP number in Texas?

The Responsible Master Plumber license number identifies the master plumber who owns or operates a plumbing company. Texas law requires it on every vehicle, estimate, and invoice, and you can verify it on the State Board of Plumbing Examiners website.

How much do plumbers charge per hour in Texas?

Licensed plumbers charge $95 to $175 per hour in Austin and Dallas, $85 to $160 in Houston and San Antonio, and $75 to $130 in smaller markets. Many companies quote flat rates per job instead.

How do I know if I have a slab leak?

Look for a warm spot on the floor, an unexplained jump in the water bill, the sound of running water when everything is off, or new cracks in the slab or walls. A plumber with electronic leak detection can confirm it for $150 to $400.

Do plumbers in Texas need workers' compensation?

No, Texas does not require private employers to carry it. Ask any plumbing company whether it does, because an uninsured injury in your home can become your liability.

Do I need a permit to replace a water heater in Texas?

In nearly every city, yes. Fees run $50 to $250, and the inspection checks venting, the relief valve, the pan and drain line, and the expansion tank.

For more contractor hiring guides and home repair pricing across Texas, browse the latest posts on our blog.