The sound that wakes you up
It usually starts with a noise you can't place. A hiss behind the drywall, a steady trickle that doesn't stop when you check the faucets, or water showing up on the ceiling below a bathroom. In Nixa, this tends to happen on the coldest nights of the year, often right after a hard freeze following a few mild days, which is exactly the kind of temperature swing the Ozarks are known for in January and February. Pipes that handled the cold fine the week before suddenly split because the ground and crawl space temperatures dropped faster than the house could keep up.
If you're reading this at 2 a.m. with a flashlight in hand, the first thing to know is that finding the leak matters less right now than stopping the flow. Chasing the exact source can wait a few minutes. Water damage gets worse every minute the supply keeps running.
Shut off the water before you do anything else
Every house in the area has a main shutoff valve, and in a lot of Nixa homes, especially the ranch-style houses and split-levels built from the 1970s through the 1990s that make up a large share of the housing stock here, that valve sits in the crawl space or utility closet near where the water line enters the house. Newer builds out toward Spring Creek Road or the subdivisions off Highway 14 often have it in the garage or a mechanical room instead.
Turn it clockwise until it stops. If you've never located this valve before, now is not the time to search for the first time, which is why it's worth finding it on a calm afternoon long before you need it in the dark. Mark it with a tag or a strip of tape so anyone in the house can find it fast.
If the main valve is seized or won't budge, the city or your water utility has a shutoff at the meter, usually near the street in a concrete box. That one takes a meter key or a pair of channel-lock pliers, and it's stiffer to turn than people expect.
More on this from Reading List What To Shut Off First When A Pipe Lets Go At Night.
Kill the power to anything near the water
Once the water's off, think about electricity. A lot of homes in this area have water heaters, furnaces, or electrical panels in the same crawl space or basement area where pipes freeze and burst, because that's where the water lines run. If water is pooling anywhere near outlets, switches, or the breaker panel, shut off power to that area at the main panel before you wade in with a flashlight. Standing water and live wiring don't need a lecture, just distance until the breaker's off.
What to check while you wait for daylight
With the water and any nearby power shut off, you can slow down a little. Open the lowest faucet in the house to let residual water drain out of the pipes and relieve pressure. If it's a toilet supply line or a washing machine hose that failed, those usually have their own small shutoff valves right at the fixture, which saves you from killing water to the whole house.
Look at where the water is going, not just where it's coming from. In homes with crawl spaces, which is most of Nixa outside of the newer slab-on-grade construction, water can travel along floor joists and show up in a completely different room than the actual break. Take photos now if you're thinking about insurance later. Towels and a wet-dry vac can hold the line until morning, but don't assume a quiet hour means the problem is solved. A frozen section upstream can still thaw and start leaking again once the house warms up.
When it stops being a homeowner job
Shutting off water and power is something almost anyone can do with the right information ahead of time. Cutting into a wall, soldering a copper joint, or working on PEX connections in a crawl space with standing water is a different matter, especially at night when you're tired and the lighting is bad. If the break is in a spot you can't safely reach, if the shutoff valves themselves are corroded or leaking, or if you're dealing with a slab leak where water is coming up through the floor, that's the point to call an emergency plumber rather than improvise.
This is especially true for the older homes around downtown Nixa and the county roads outside town, where galvanized pipe is still common and tends to fail in ways that are harder to patch temporarily. A short-term fix on the wrong kind of pipe can turn a bad night into a bad week. Once the water's off and the immediate danger is handled, there's no harm in waiting a few hours for daylight and a professional opinion, as long as nothing is actively flooding.