Leak detection in Cypress, TX for slabs, walls, attics, yards, sprinklers and pools
A high MUD bill or a meter that won’t stop turning means water is going somewhere you can’t see. We isolate the system section by section, then listen, scan and test until we can put a mark on the exact spot, without tearing into walls or floors on a hunch.
Leak detection in Cypress, TX starts at your MUD water meter. We confirm water is moving with everything off, isolate the house, yard line, irrigation and hot and cold sides, then pinpoint the leak with pressure testing, acoustic listening, thermal imaging, moisture meters and, for small or plastic-pipe leaks, tracer gas. You get the location and a written repair price.
Signs you have a hidden water leak
Most hidden leaks in Cypress announce themselves in one of three places: the water bill, the house, or the yard. You don’t need all of these signs. One clear sign plus a moving meter is enough to call.
On the bill
Usage climbs month after month with the same family and the same habits. A jump in a cool month, when sprinklers should be running less, is especially telling.
Inside the house
A warm spot on tile, a ceiling stain under a bathroom, baseboards that swell, a musty closet, or the sound of water moving when everything is off.
In the yard
A soggy strip between the meter box and the house, a patch of grass that stays greener than the rest in August, or water pooling near a sprinkler head that isn’t running.
The U.S. EPA’s WaterSense program says the average household’s leaks waste more than 9,300 gallons a year, and that nine percent of homes have leaks wasting 50 gallons or more per day. Those are national numbers, but the pattern holds here: most leaks are small and slow, and a few are big enough to show up on a bill within one cycle.
Start with the meter: the leak test anyone can do
Your water meter is the best leak detector you own. It sits in a box near the street, usually at the front property line, and it is owned by your Municipal Utility District. Everything from the meter to your fixtures belongs to you: the yard line, the pipes under the slab, the lines in your walls and attic, and the water heater. That ownership line is why the meter test matters. If the meter moves with every fixture off, the water is going somewhere on your side.
Turn everything off
Stop all water use in the house. Make sure the dishwasher, washing machine, ice maker and water softener are not in a cycle, and turn the irrigation controller off, not just paused.
Read the meter
Lift the meter box lid carefully and watch for fire ants and wasps. Many meters have a small triangle or star that spins with even a tiny flow. Write down the full reading and the time. Our homepage has a quick version of this under the two minute meter leak test.
Wait without using water
EPA WaterSense suggests waiting two hours without using any water, then reading the meter again. If the meter changes at all, you probably have a leak.
Close the house shutoff and test again
If the meter is moving, close the main shutoff where the supply line enters the house. If the meter keeps moving, the leak is likely in the yard line between the meter and the house, or on an irrigation or pool line that branches off before the shutoff. If it stops, the leak is inside the house.
Check the toilets
EPA WaterSense says to put a few drops of food coloring in the toilet tank. If any color shows up in the bowl after 10 minutes, that toilet is leaking. A leaking flapper is one of the most common reasons for a high bill, and it’s a quick fix covered on our toilet repair page.
Why is my water bill so high in Cypress?
Cypress is unincorporated Harris County, so your water and sewer usually come from a MUD rather than a city. That changes how a leak shows up on your bill.
First, MUD bills are based on what passes your meter. A leak on your side of the meter is billed like any other water you use. Second, the regional water authority fee is charged by volume. The Harris-Galveston Subsidence District requires the North and West Harris County Regional Water Authorities to reach at least 60 percent surface water by 2025 and 80 percent by 2035. One area MUD, Northampton MUD, explained in 2017 that the North Harris County Regional Water Authority bills the district per 1,000 gallons pumped and that the district passes the fee to residents based on actual usage, with a percentage added for flushing and district use. So every 1,000 gallons a leak wastes is charged both the MUD’s water rate and the authority fee.
Rates move over time. Community Impact reported in March 2023 that the North Harris County Regional Water Authority cut its rates by $0.50 per 1,000 gallons, and that some MUDs passed the cut through while at least one kept residents’ rates the same. Read your own bill for the current line items. The point is simple: a leak is billed per gallon, and the per-gallon cost includes more than the water itself.
High water bill troubleshooting
Inframark’s utility district FAQ lists the items to check after a high bill: running toilets, irrigation and sprinkler settings, water heater leaks, leaking faucets, outside faucet and sprinkler leaks, the water softener, pool and water feature leaks, and appliance leaks. Here is how we work through that same list in a Cypress house.
| Possible cause | Quick homeowner check | What it usually looks like |
|---|---|---|
| Running toilet | Food coloring in the tank, check the bowl after 10 minutes | Meter moves slowly at night, toilet refills on its own |
| Irrigation schedule | Read the controller program; look for extra start times or long run times | Bill rises in summer, meter is still when the system is off |
| Irrigation leak | Run each zone and walk it; look for pooling or a weak head | Soggy spot, green strip, meter moves only when a zone runs |
| Water heater | Look at the drain pan and the T&P discharge line | Water in the pan, a dripping discharge pipe, a ceiling stain under an attic unit |
| Faucets and showerheads | Look and listen at each fixture | Visible drip; EPA says one drip per second wastes more than 3,000 gallons a year |
| Water softener | Check the regeneration schedule and drain line | Water running to the drain at odd hours |
| Pool or water feature | Bucket test on the top step for a week | Pool loses more than the bucket; autofill runs constantly |
| Yard service line | Close the house shutoff; does the meter still move? | Meter moves with the house off, wet ground between meter and house |
| Slab or wall leak | Meter moves with house open and irrigation off; check for warm floors | Steady flow day and night, warm tile, musty room |
EPA WaterSense also gives a seasonal benchmark: in a colder month like January or February, a family of four using more than 12,000 gallons a month could have a serious leak. In Cypress, irrigation drops off in winter, so a winter bill is the cleanest look at indoor use.
Some districts consider bill adjustments after a repaired leak, and some don’t. Policies vary by MUD, so ask yours. If you do ask, the repair invoice and the leak location from a plumber are usually what they want to see.
Where hidden leaks hide in Cypress homes
A Cypress house has more places for water to hide than most people think. Here is each one, how leaks there usually behave, and how we look for them.
Under the slab
Supply lines under or through the concrete foundation are stressed by our expansive gumbo clay, which swells when wet and shrinks in drought. A slab leak usually runs day and night, keeps the meter moving with the house shutoff open, and may show as a warm spot if it’s on the hot side. Once we locate it, the repair options, from a spot repair to tunneling to a reroute, are covered on our slab leak repair page.
Inside walls and ceilings
Lines in walls feed showers, tubs, sinks and the washer box. A leak here often shows as a stain, bubbling paint, a soft spot in drywall, or swollen baseboard. Second-floor bathrooms leak down into first-floor ceilings, so a stain under an upstairs bathroom is a common call. Drain leaks matter too: a shower drain or pan leak only drips when the shower runs, and it won’t move the meter.
Attic lines and attic water heaters
Many Cypress homes have supply lines running through the attic, and plenty have the water heater up there too. Attic leaks show up as ceiling stains, drips from light fixtures or vents, or water in the heater’s drain pan. Winter adds a twist: Bush Intercontinental averages about 9.6 days a year at or below freezing, and Cypress-area MUDs such as Kingsbridge MUD and Harris County MUD 188 issued hard freeze warnings in January 2026 telling residents to insulate pipes. A line that split in a freeze can drip quietly into insulation for days before the ceiling shows it. Freeze breaks are covered on our burst pipe repair page.
The yard line between the meter and the house
The service line from the meter to your house is yours, not the MUD’s. It’s buried in the same clay as your slab, and it crosses the front yard where roots, driveway edges and settling all work on it. A yard line leak keeps the meter moving even with the house shutoff closed. Sometimes it shows as a soggy strip or a sinkhole along the line. Sometimes it drains into the soil and you see nothing at all.
Irrigation systems
Sprinkler systems are standard in many master-planned Cypress neighborhoods, and they are a big share of summer water use. EPA WaterSense says an irrigation leak only 1/32 of an inch across can waste about 6,300 gallons a month. Irrigation leaks usually show up only when a zone runs, at a broken head, a cracked lateral line or a valve that won’t close fully. A valve that weeps into its box can run all day. Freeze warnings from local MUDs in January 2026 specifically told residents to shut off irrigation. A cracked valve or backflow assembly after a freeze is a common spring surprise.
Pools and water features
A pool loses some water to evaporation and splash every week, especially in a Cypress August. The question is whether it’s losing more than that. Pool chemistry company Orenda describes the bucket test: mark the water level inside a bucket and on the pool, set the bucket on the top step or sun shelf, leave it alone for a week, and compare. If the pool dropped significantly more than the bucket, it’s most likely a leak. Pool shell and equipment repair belongs to pool specialists. What we handle is the plumbing side: the fill line, an autofill valve that sticks open, and the supply line that feeds them.
Toilets, faucets and fixtures
A worn flapper or fill valve can leak silently into the bowl all day. The food coloring test above finds it in 10 minutes. Faucets and showerheads leak in plain sight, but they add up: EPA WaterSense says a showerhead leaking 10 drips a minute wastes more than 500 gallons a year.
Water heaters and softeners
A tank that is starting to fail, a weeping T&P valve, or a softener stuck in regeneration all waste water without showing much. Check the heater’s drain pan and discharge line, and listen for a softener running to the drain at odd hours. Problems with the heater itself go to our water heater repair team.
Leak detection methods we use
No single tool finds every leak. Clay soil, tile floors, PEX pipe and loud air handlers each change which method works best. We combine methods, and we confirm with a second method before we recommend opening anything.
| Method | What it does | Best for | Limits |
|---|---|---|---|
| Meter test | Confirms water is moving with all fixtures off | Every job; the first step | Proves a leak exists, not where it is |
| Isolation and pressure testing | Closes sections and watches a gauge to see which one loses pressure | Narrowing to hot vs. cold, house vs. yard, branch by branch | Needs working valves; tells the line, not the spot |
| Acoustic listening | Amplifies the sound of water escaping a pressurized pipe | Slab and buried lines under hard surfaces | Background noise and depth make it harder |
| Thermal imaging | Shows surface temperature differences from warm or wet areas | Hot water leaks under floors, wet spots in walls and ceilings | Shows temperature, not water; needs confirmation |
| Moisture meter | Measures moisture in drywall, wood and flooring | Confirming what the thermal camera suggests, mapping wet areas | Reads only where it touches |
| Tracer gas | Fills the line with a hydrogen and nitrogen mix and detects where it escapes | Small leaks, plastic pipe, yard lines | Line must be emptied and isolated |
| Drain camera | Puts a camera inside drain and sewer lines | Leaks and breaks in drains that don’t affect the meter | For drains, not pressurized supply lines |
Isolation and pressure testing
Pressure testing is how we turn “you have a leak” into “it’s on this line.” We close valves to separate the hot side from the cold side, the house from the yard, and one branch from another, then watch a gauge on each section. A section that can’t hold pressure has the leak. A North Texas plumbing company lists hydrostatic pressure testing among its standard slab leak methods, and it’s the step that keeps the rest of the search short.
Acoustic leak detection
Water escaping a pressurized pipe makes noise. Acoustic equipment uses ground microphones and headphones to pick up that sound through concrete and soil, and the sound is loudest right over the leak. A Houston plumbing company’s slab leak guide lists acoustic listening alongside infrared imaging and pressure testing as the way to find a slab leak without random concrete damage, usually in about 1 to 3 hours. Acoustic work is harder near a running air handler, a pool pump or traffic on a busy road like Barker Cypress or Spring Cypress, so we shut down what we can and sometimes come back when it’s quieter.
Thermal imaging
A thermal camera reads surface temperature. InterNACHI, the home inspector association, explains that the camera sees the apparent temperature difference between wet spots and building materials, and that thermal imaging should be used together with a moisture meter. For a hot water leak under tile, the camera often shows a warm bloom right over the leak. For a cold leak in a wall, the wet area usually reads cooler than the dry drywall around it.
Moisture meters
A moisture meter confirms what the camera suggests. We use it to map how far water has spread in drywall, baseboards, cabinet bottoms and subfloor. That map is useful for the repair and for your insurance adjuster.
Tracer gas
Some leaks are too small or too quiet to hear, and plastic pipe like PEX and CPVC doesn’t carry sound the way copper does. That’s where tracer gas helps. Leak detection equipment maker INFICON describes the method: the section is emptied and isolated, a mix of 95 percent nitrogen and 5 percent hydrogen is injected at low pressure, and because hydrogen escapes through the smallest openings, it rises to the surface where a detector picks it up. INFICON recommends the method for small or hard-to-find leaks, non-metallic pipe, small service pipes and cases that need precise pinpointing, and says its detector can usually pinpoint within a few feet depending on ground conditions. The mix is described as non-toxic and non-flammable.
Drain line testing
Drain leaks don’t turn the meter, because drains aren’t under pressure. If water shows up only when a shower runs or a toilet flushes, we look at the drain side with a camera and a flood or fill test. Breaks in the main drain or the yard sewer are covered on our sewer line repair page.
How a leak detection visit works
Phone triage
We ask what you’ve seen, what the bill did, and whether the meter moves with everything off. If water is actively coming through a ceiling or floor, we walk you through a shutoff first.
Meter and isolation
On site, we confirm the meter, then separate the yard from the house, the irrigation from the domestic water, and hot from cold. This step alone often cuts the search area down to one line.
Pinpoint
We use acoustic, thermal, moisture and, when needed, tracer gas methods on the suspect line, and confirm with at least two readings before marking anything.
Mark and document
We mark the leak location, take photos of the readings and the marked spot, and write up what we found. You keep the documentation for repairs, insurance or the MUD.
Repair options in writing
You get a written price for the repair options that fit. If it’s a slab leak, that may include spot repair, tunneling or a reroute. If the house has had several leaks, we may also price repiping.
We lay drop cloths, wear shoe covers and keep the work area clean throughout. If we open a small access point to confirm a wall leak, we tell you before we cut and we keep it as small as the job allows.
Leaks, documentation and insurance
Finding a hidden leak quickly matters for your insurance as much as for your water bill. The Texas Department of Insurance says most homeowner policies cover sudden and accidental water damage, while damage from gradual leaks and seepage is usually excluded. TDI also says hidden water damage generally must be reported within days of when you first see it.
- Report early. Tell your insurer as soon as you know there’s water damage.
- Photograph first. Take photos or video of the damage before cleanup or repairs.
- Keep damaged items. TDI says not to throw them away until the adjuster has seen them.
- Temporary repairs only. Stop the water, but hold off on permanent repairs until the insurer sees the damage.
- Keep the leak report. Our photos, readings and marked location help show where the water came from.
Leak detection cost and the cost of waiting
We don’t publish a flat leak detection price, because the work varies. A running toilet found during the first meter check is a very different visit than a quiet PEX leak under a 3,000 square foot slab that needs tracer gas. We give you a written price before work starts, and we tell you if the job changes scope.
What changes the work:
- How much the meter moves. A fast-moving meter is usually easier to trace than a very slow one.
- Pipe material. Copper carries sound well for acoustic work; PEX and CPVC often need tracer gas.
- Valves that work. Old, stuck valves make isolation harder.
- How many systems are involved. House, yard line, irrigation and pool lines each add testing time.
- Floor coverings and access. Thick carpet and pad, stone tile and finished attics all affect what we can scan.
Waiting has a cost too. EPA WaterSense says fixing easily corrected household leaks can save about 10 percent on water bills. A hidden leak also keeps soaking whatever is around it. Under a slab, that means wet clay under one part of the foundation. In a wall, that means drywall, insulation and mildew in a climate where average relative humidity is about 74.7 percent. For general pricing context on our services, see the cost section on our homepage.
Which Cypress homes need leak detection most
Every house can leak, but the leaks we find tend to follow the age of the neighborhood and what was built into it. These are general patterns, not rules.
Established 77429 and 77070 neighborhoods
Lakewood Forest and Ravensway date back to the 1970s, and Longwood Village and Cypress Mill to the 1990s. Older copper and galvanized lines, polybutylene in some late 80s to mid 90s homes, and decades of clay movement make slab and yard line leaks the most common finds.
2000s master-planned communities
Coles Crossing, Cypress Creek Lakes and the Villages of Cypress Lakes were built mostly in the late 90s and 2000s. Irrigation systems, attic water heaters and copper or CPVC lines reaching the age of their first leaks keep us busy here.
Newer 77433 communities
Bridgeland, Miramesa, Dunham Pointe, Marvida and other newer communities near the Grand Parkway mostly use PEX. Leaks here tend to be at fittings, irrigation and pool fill lines, and acoustic work on PEX often needs tracer gas backup.
Homes with pools and large lots
Large-lot areas like Ravensway and lake communities like Towne Lake often have long yard lines, pools and big irrigation systems. More buried pipe means more places for a leak, so isolation testing matters even more.
What buyers, sellers and landlords should check
- Buyers: run the meter test during your option period with irrigation off. Ask for 12 months of MUD bills and look for unexplained spikes.
- Sellers: a leak found and fixed before listing, with a written report, is easier to disclose than a surprise during the buyer’s inspection.
- Landlords: if tenants pay the water bill, they may not tell you it doubled. A meter check at each turnover catches leaks early.
- Everyone: know where your main shutoff and irrigation shutoff are. Our property owner section covers the basics.
Before hiring anyone, check the license. The Texas State Board of Plumbing Examiners runs a free public license search at tsbpe.texas.gov. Every job we do is handled by Texas-licensed plumbers.
Questions Cypress homeowners ask about leak detection
How do I know if I have a hidden water leak?
Turn off all water use, including irrigation, and read your meter. EPA WaterSense suggests waiting two hours without using water and reading it again. If the meter changed at all, you probably have a leak somewhere on your side of the meter.
Why is my MUD water bill suddenly so high?
The most common causes are running toilets, irrigation schedules or leaks, water heater leaks, softeners and pool autofills. A leak on your side of the meter is billed like normal use, and the regional water authority fee is charged per 1,000 gallons too, so leaks cost more than the water alone.
Who is responsible for a leak between the meter and my house?
You are. In Cypress, the MUD owns the meter and the street side. The homeowner owns everything from the meter to the fixtures, including the yard line, the pipes under the slab and the water heater.
Can you find a leak without tearing up my floors or walls?
Usually, yes. We use isolation and pressure testing, acoustic listening, thermal imaging, moisture meters and tracer gas to pinpoint the spot before anything is opened. We confirm with two methods before we recommend cutting into anything.
What is tracer gas leak detection?
The line is emptied and filled with a mix of 95 percent nitrogen and 5 percent hydrogen. Hydrogen escapes through very small openings and rises to the surface, where a detector finds it. It works well on small leaks and plastic pipe like PEX.
Can a thermal camera see water leaks?
A thermal camera sees temperature, not water. Wet areas and hot water leaks show as temperature differences. InterNACHI says thermal imaging should be used together with a moisture meter to confirm what the camera shows.
How do I check for a toilet leak?
Put a few drops of food coloring in the toilet tank and don’t flush. EPA WaterSense says if any color shows up in the bowl after 10 minutes, the toilet is leaking, usually at the flapper.
How do I tell if my pool is leaking or just evaporating?
Do a bucket test. Mark the water level in a bucket and on the pool, set the bucket on the top step for a week, and compare. If the pool drops significantly more than the bucket, it’s most likely a leak.
How much water can an irrigation leak waste?
EPA WaterSense says an irrigation leak just 1/32 of an inch across can waste about 6,300 gallons a month. Irrigation leaks often show only when a zone runs, so check the meter with the system on and off.
Will my MUD adjust my bill after a leak?
It depends on the district. Some MUDs consider adjustments after a repaired leak and some don’t. Ask yours directly, and keep the plumber’s invoice and leak report, since that’s usually what they ask for.
Do you offer 24 hour emergency leak detection in Cypress?
We answer live 24/7, including nights, weekends and holidays. If water is actively coming through a ceiling or floor, we help you shut it off first, then locate the leak and give you a written repair price.
Sources and further reading
Facts on this page come from these public sources, checked in October 2026. Links open in a new tab.
Related plumbing services in Cypress
Cypress neighborhood guides for this service: plumbing in Ravensway, plumbing in Rock Creek, plumbing in Villages of Cypress Lakes.
If your meter is moving with everything off or your MUD bill jumped for no reason, we can find the leak and give you a written price to fix it. Call (281) 664-2542.
Leaking attic heater in Bridgeland, slab leak in Fairfield or a backup in Lakewood Forest?
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