Got a High Water Bill in Houston? Here's What to Check

You open your water bill and the number doesn't make sense. Maybe it's $80 more than last month. Maybe it doubled. You haven't been filling a pool, watering the lawn any more than usual, or running the hose for hours. Something is wrong — and if you're a Houston homeowner, the most likely explanation is a hidden water leak.

High water bills are one of the most common reasons homeowners call us. In most cases, the culprit is a leak they can't see — buried under the slab, behind a wall, in the irrigation system, or in a toilet that's been silently running for weeks. The good news is that these leaks are findable and fixable, and in many cases your water provider will adjust your bill once you prove the leak has been repaired.

Here's a step-by-step guide to figuring out why your Houston water bill spiked and what to do about it.

Step 1: Do the Water Meter Test

Before anything else, confirm that you actually have a leak. This takes five minutes and costs nothing.

1. Turn off every water-using fixture and appliance in your home. That means faucets, showers, dishwasher, washing machine, ice maker, and irrigation system. Make sure no toilets are filling.
2. Go to your water meter. In Houston, it's usually in a concrete box near the curb. Lift the cover and look for the flow indicator — it's a small triangle or dial on the face of the meter.
3. Watch the flow indicator. If it's spinning or moving with everything turned off, water is flowing somewhere it shouldn't be. You have a leak.
4. For a slower test: Write down the meter reading, don't use any water for 2 hours, then check again. If the number changed, there's a leak in the system.

Important note for Houston homeowners: Some properties have more than one water meter — especially if you have a separate irrigation meter or if the house was built with a secondary line. Make sure you know which meter feeds what before you test. If you're on a MUD (Municipal Utility District), the meter may look different than City of Houston meters, but the test works the same way.

Step 2: Check the Obvious Stuff First

Before you call anyone, rule out the easy fixes. These are the most common causes of unexpectedly high water bills that don't require professional help:

Running Toilets

A toilet with a bad flapper valve can waste 200 gallons per day — that's 6,000 gallons per month — without making much noise. Drop a few drops of food coloring into the tank (not the bowl). Wait 15 minutes without flushing. If the color appears in the bowl, your flapper is leaking. A new flapper costs $5 at Home Depot and takes two minutes to replace.

Irrigation System Leaks

Sprinkler systems in Houston take a beating. Our clay soil shifts with moisture changes, cracking underground PVC lines and popping heads off risers. Walk your zones one at a time while the system is running. Look for geysers, flooding in one area, heads that aren't popping up, or zones that have low pressure. An irrigation leak can waste hundreds of gallons per cycle without anyone noticing.

Dripping Faucets and Fixtures

A faucet dripping once per second wastes about 5 gallons per day — roughly 150 gallons per month. That's not enough to explain a $100 spike, but it adds up. Check under sinks for slow drips at the supply connections too.

Water Softener or Filtration System Issues

If your water softener gets stuck in a regeneration cycle, it can run water continuously. Check the display for error codes or stuck cycle indicators. Same goes for whole-house filtration systems with automatic backwash.

Step 3: Look for Signs of a Hidden Leak

If the meter test confirmed a leak but you can't find an obvious source, you're likely dealing with a hidden leak — the kind that's behind walls, under floors, or beneath your foundation. Here's what to look for:

• Warm or hot spots on the floor — a hot water supply line leak under the slab heats the concrete above it. Walk around barefoot on tile floors and feel for temperature differences.
• The sound of running water when everything is off — stand in a quiet room (especially near the center of the house) and listen for hissing, rushing, or dripping sounds.
• Damp or discolored areas on walls, baseboards, or flooring — water from a hidden leak has to go somewhere, and it often shows up as staining, bubbling paint, or warped flooring.
• Musty or mildew smells — persistent moisture breeds mold fast in Houston's humidity. If a room smells musty near the floor, there may be water accumulating underneath.
• Cracks in walls or foundation — a slab leak saturates the clay soil beneath your home, causing it to expand unevenly. This can shift your foundation and create visible cracks around doors, windows, and baseboards.

If you're seeing one or more of these signs, you very likely have a slab leak or a leak in a supply line running through or under your foundation. This is where professional leak detection comes in.

Step 4: Call a Professional Leak Detection Company

Here's the thing most people don't realize: a plumber and a leak detection specialist are different jobs. A plumber fixes pipes. A leak detection company finds them — without tearing up your house to do it.

Professional leak detection uses specialized equipment to locate the exact point of the leak non-invasively:

• Acoustic listening devices that amplify the sound of water escaping from pipes, even through concrete
• Thermal imaging cameras that detect temperature differences caused by leaking water beneath floors and behind walls
• Electronic moisture meters that measure moisture levels in concrete, drywall, and flooring materials
• Pressure testing to isolate which line is leaking — hot supply, cold supply, or drain

The goal is to pinpoint the leak location down to a small area so that when the plumber comes in, they know exactly where to cut — no guessing, no unnecessary demolition, minimal repair costs.

A standard leak detection inspection in Houston costs around $325. Slab leak detection runs $450 to $550 because of the additional equipment and expertise required. It's an investment that typically saves homeowners thousands in avoided damage and targeted repairs.

Step 5: Get Your Water Bill Adjusted

This is the part most Houston homeowners don't know about: many water providers offer a one-time leak adjustment on your bill once you can prove the leak was found and repaired.

The process varies by provider, but here's the general approach:

1. Get a professional leak detection report documenting the leak location, type, and findings. At Exact Leak Detection HTX, every inspection includes a detailed written report with photos and thermal images.
2. Get the leak repaired by a licensed plumber and keep the invoice showing the work was completed.
3. Contact your water provider (City of Houston, your MUD, or your water district) and ask about their leak adjustment program. Most will want to see the detection report and the repair invoice.
4. Submit the paperwork and request a credit or adjustment on the months affected by the leak.

Every provider has different policies, but we've seen homeowners get significant credits — sometimes several hundred dollars — when they can show clear documentation of the leak and repair. A professional leak detection report makes this process much smoother.

Common Causes of High Water Bills in Houston Specifically

Houston has some unique factors that make water leaks more common and more expensive than in other cities:

• Expansive clay soil: Houston sits on heavy clay that swells when wet and shrinks when dry. This constant movement stresses underground pipes, causing cracks at joints and fittings. It's the #1 reason slab leaks are so common here.
• Aging copper plumbing: Homes built from the 1970s through the early 2000s often have copper supply lines running under or through the slab. Houston's water chemistry and soil conditions accelerate corrosion, leading to pinhole leaks that grow over time.
• Extreme heat cycles: Houston summers push ground temperatures high enough to stress pipe materials, especially at transitions between different pipe types (copper to PEX, PVC to galvanized).
• Irrigation system wear: With Houston lawns needing regular watering for much of the year, sprinkler systems rack up thousands of cycles. Underground PVC lines, especially in clay soil, crack and separate at joints.
• Municipal water pressure fluctuations: Pressure spikes from the city or MUD system stress aging pipes, particularly at elbows and tee fittings where the water changes direction.

How Much Water Can a Hidden Leak Waste?

Here are some real numbers to put it in perspective:

• Pinhole leak in a supply line: 20–30 gallons/day → 600–900 gallons/month
• Running toilet (bad flapper): 100–200 gallons/day → 3,000–6,000 gallons/month
• Cracked irrigation line: 50–500+ gallons per watering cycle, depending on the break
• Slab leak (moderate): 50–100+ gallons/day → 1,500–3,000+ gallons/month

To put that in dollar terms: Houston-area water rates vary by provider, but a 5,000-gallon-per-month leak can easily add $50 to $150+ to your bill — and that's on top of potential damage to your foundation, flooring, and walls that can cost thousands to repair if left unchecked.

Don't Ignore It — Leaks Only Get Worse

The biggest mistake we see homeowners make is waiting. A high water bill is your earliest warning sign. The leak isn't going to fix itself, and the damage it's causing — to your foundation, your flooring, your walls, and your wallet — is compounding every day it goes undetected.

The sooner you find it, the cheaper it is to fix. A $325–$550 leak detection inspection can save you thousands in water waste, repair costs, and potential insurance headaches down the road.