Pipes in Olathe freeze mostly inside the building, in exterior walls, garages, attics, crawl spaces and empty houses, from about December through February. WaterOne reports that nine in ten freeze calls turn out to be plumbing inside the building. Many frozen pipes leak only as they thaw, so the damage often appears on the warm-up. Close the main shut-off first.
Key takeaways
- WaterOne reports that nine out of ten freeze calls turn out to be plumbing inside the building rather than its meters or mains.
- The risk season runs roughly December through February, with November and March as shoulder months.
- Exterior walls, unheated garages, attics, crawl spaces, hose bibs and vacant houses are where pipes freeze first.
- A frozen pipe often leaks only once it thaws, so the water may show up after the cold night has passed.
- Water from a burst supply line usually starts clean, but drywall, carpet and pad left wet can begin to grow mold within a day or two.
- WaterOne says it is not responsible for damage mitigation after a water main break, so the cleanup question has to be checked separately from the pipe repair.
When does the freeze actually arrive in Olathe?
Pipe-freezing risk in Olathe runs roughly from December through February, with real exposure in November and March. The National Weather Service puts the average first freeze around late October and the average last freeze around early April for Kansas City. A single deep cold night can still come at any point in that window.
The calendar matters less than the overnight low and where the pipe runs. A pipe inside a heated, insulated basement rarely gets cold enough to freeze. A pipe in an exterior wall, an unheated garage or an attic can freeze after one hard night, especially if the thermostat was turned down while the house was empty. That is why a mild November can still produce a burst line in a house that was not prepared for the first real cold snap.
The average dates are a planning tool, not a promise. The National Weather Service cautions that topography, the difference between urban and rural settings, and where instruments sit all make temperatures vary across an area, so nobody can say that a given street will freeze on a given night. What you can plan for is the season itself: check exposed pipes before the first hard cold in late autumn, and again whenever a deep cold front is forecast for the week ahead.
Which pipes in a post-1980 Olathe house go first?
In the post-1980 subdivisions that make up most of the city, the pipes at risk are the ones outside the heated part of the house. That means exterior walls, the garage, the attic, the crawl space and the outdoor hose bib. Olathe, the county seat of Johnson County with about 150,000 residents, has a lot of houses built this way.
Most Olathe houses from the last four decades are two-storey homes on poured full basements, usually finished, with supply lines in PEX or copper. Those runs are well protected while the house is heated. The trouble is any run that crosses a cold space: a supply to an upstairs laundry on an exterior wall, a washing machine box set against an outside wall, an ice-maker line in a kitchen wall that faces the garage, or a bathroom built out over the garage. Those are the lines to check first, because they lose heat fastest.
Hose bibs deserve their own check. A hose left attached traps water in the outdoor pipe, and that pipe can split when the cold reaches the valve. Vacant rentals, closed-up lake houses at Lake Quivira, Gardner Lake and Hillsdale, and any house with the heat turned down while the owners are away are where a lot of freeze damage begins. Nobody is in those buildings to notice water until the thaw, which is why the damage tends to be larger when it is found.
What does WaterOne say about frozen pipes?
WaterOne reports that meters and mains freeze only occasionally, and that nine out of ten freeze calls are plumbing inside the building. The pipe most likely to freeze is probably your own, so the first protection is inside the house. Its advice is simple and practical.
WaterOne suggests opening cabinet doors under sinks on exterior walls so heated room air can reach the pipes. It recommends trickling the tap farthest from the water entry point so that some water keeps moving, and keeping the thermostat above 65°F, including when the house is empty. If a pipe is already frozen, shut the main before you thaw it, and use a hair dryer rather than a blowtorch. Those steps protect the pipe and the person doing the thawing.
WaterOne also suggests asking for a precautionary shut-off before a long absence, and it lists 913-895-1800 for that request. A shut-off before a holiday trip is one of the simplest protections a closed-up house can have, because it limits how much water can come out of a split line while nobody is home. Knowing where your own main shut-off is, before a cold night, saves time when it matters.
What should I do in the first hour after a pipe bursts?
Close the main shut-off, stay out of standing water near the electrical panel, the furnace or any basement outlet, and photograph the damage before anything is moved. Then arrange for the water to be removed and the building dried. Drying is the urgent part.
Find the main shut-off and close it first, before you look for the break. If water is near the panel, the furnace, the water heater or an outlet, do not step into it. If you cannot reach the power safely without standing in water, leave it alone and call for help. Keep children and pets out of the wet area as well, particularly if the water came up through a floor drain.
Photograph the ceiling, walls, floor and the waterline before you move furniture or start pulling up carpet. Your insurer will want that record. A crew is dispatched as fast as one is available, and the phones are answered 24/7. The crew can extract the water, set air movers and dehumidifiers, and take moisture readings until materials are dry. EPA guidance says mold can grow on wood, drywall, carpet and furniture left wet for more than 24 hours, and that wet areas should be dried within 24 to 48 hours.
What do I do after a thaw, when the water shows up?
Treat the thaw as a new leak. Walk the route of every pipe that was exposed to the cold, check the ceiling below any upstairs bathroom, and close the main if you have not already. Do not assume the ice held the damage back.
A pipe that froze and split often leaks only as it warms, sometimes hours after the cold has passed, and sometimes after a house has been empty for a day or more. That is why calls spike on the warm-up rather than on the cold night. After a thaw, check the garage wall, the bathroom behind the tub, the cabinet under the sink, the crawl space hatch and any outdoor spigot. A stain on a ceiling below an upstairs bath is a sign to go up and check the supply line above it.
Thawing needs care of its own. WaterOne's advice is to shut the main before you thaw a pipe and to use a hair dryer, never a blowtorch. A licensed plumber repairs the split or the failed fitting. The water cleanup, the drying and any removal of drywall or flooring belong to the restoration crew, and repairs after drying are quoted separately once someone has seen the wet area.
Is a burst pipe covered by insurance, and what about a main break?
A standard homeowners policy generally responds to sudden and accidental water damage, such as a burst supply line. Coverage is decided by your insurer under your own policy. A break in the public water main is handled differently, and the utility's position is worth knowing.
Check your policy and ask your agent how it treats sudden water damage, rather than assuming the answer. The crew can document the damage for your claim with photos and moisture readings, but the insurer decides what is covered. Keep receipts for the emergency stage and any temporary measures, such as board-up or a tarp, and keep the damaged materials until the adjuster has had a chance to see them, where that is practical.
WaterOne states that water main breaks are not an act of negligence and that it is not responsible for damage mitigation. It does offer an initial courtesy cleanup, arranged through its insurance coordinator, at 913-895-5520 in business hours and 913-895-1800 after hours. Ask about that option if the water came from a main rather than a line inside the house, because the answer changes who arranges the first cleanup.
How do I check that a plumber or contractor is licensed before work starts?
Plumbing work in Johnson County is licensed through Johnson County Contractor Licensing. Look the company up in the county's online contractor search before anyone starts cutting drywall, and confirm it holds the right class for the pipe repair.
Kansas licenses contractors locally rather than statewide, and in this area that means Johnson County Contractor Licensing, which covers Olathe and the other participating cities. The county issues eleven classes, including Plumbing (DP). Plumbing, electrical, mechanical and roofing contractors must be licensed with the county, and a general contractor's class does not by itself allow plumbing work. Ask the plumber which class it holds.
The county office is at 111 S. Cherry St. in Olathe, and its number is 913-715-2233. Its contractor search shows whether a company is licensed and allowed to work. The Institute of Inspection, Cleaning and Restoration Certification, or IICRC, is an industry body rather than a licensing agency, so ask any cleanup company whether its technicians hold IICRC credentials. Kansas does not license mold remediation the way some states do, and KDHE says it does not regulate mold in homes, so industry guidance is the standard to ask about.
Frequently asked questions
Does a single cold night always burst a pipe?
No. A pipe usually needs a stretch of cold around it, not just one low reading, and the risk depends heavily on where it runs. The National Weather Service notes that temperatures vary across an area, so a pipe in an insulated basement is far less exposed than one in an unheated garage. Keeping the thermostat above 65°F and opening cabinets on exterior walls covers much of the risk. A frozen pipe may not show any sign until it thaws.
Should I leave the faucet dripping during a cold snap?
WaterOne recommends trickling the tap farthest from the water entry point, so that some water keeps moving through the line. The trickle does not replace heat, though. A house with the thermostat turned down and an unheated garage can still freeze even with a faucet running. Use the trickle together with the other steps, not in place of them.
What if I need help right now with a leak?
Call the number at (833) 490-5225, which is answered 24/7. A crew is dispatched as fast as one is available, and no arrival time can be promised. The emergency stage is explained and approved before work starts, and repairs after drying are quoted once someone has seen the wet area. Until the crew arrives, close the main shut-off if you can reach it safely.
Will mold start if the water is cleaned up quickly?
Mold can start in wet materials within a day or two. EPA guidance says it can grow on wood, drywall, carpet and furniture left wet for more than 24 hours, and that wet areas should be dried within 24 to 48 hours. Fast drying is the main way to prevent it. Mold can trigger allergy and asthma symptoms in some people, so tell the crew if anyone in the house has those conditions.
Is a frozen supply line the same as a sewer backup?
No. A frozen or burst supply line usually carries clean water, which IICRC S500 calls Category 1. A sewer backup is Category 3, the most involved to clean. In Johnson County the sewer lateral is typically the property owner's responsibility, and Johnson County Wastewater runs its own lines and its own 24/7 emergency number, 913-715-8600.
Sources
This guide is general information for Johnson County homeowners, not a substitute for an on-site inspection. Prices are estimates. See our disclaimer.