What a boil water notice is

A boil water notice, sometimes called a boil water advisory, is a message from a water system telling customers that tap water may need to be boiled before use. In Missouri, these notices usually come from a city, a water district, or another public water system that serves many homes. The notice is a precaution. It tells you what to do while the provider checks its system, and it does not explain what caused the concern.

If your home has a private well, the situation is different. A private well is not a public system, so you are the one who tests it and decides what to do. Missouri private well owners often rely on their own sampling and on guidance from local health officials when a question comes up. If you are unsure whether your well was affected by flooding or a nearby problem, ask your local health office how to sample.

While the notice is in effect

  • Use water that has reached a rolling boil and then cooled for drinking, making ice, brushing teeth, and preparing food.
  • Use bottled water if the notice says it is the better choice, or if you have no safe way to boil.
  • Keep boiled or bottled water in a clean, covered container.
  • Do not rely on a filter alone unless the notice or your local health office says a specific treatment is acceptable.
  • Keep following the notice until the provider announces that it has been lifted. Water that looks clear is not the signal to stop.

How a notice ends in Missouri

A provider typically tests the system after the problem is fixed, then announces that the notice has been lifted. Watch for that announcement from the same source that issued the first notice, such as a website, a mailed letter, a text alert, or a posted notice at a local office. A neighbor saying the notice is over is not enough. When a notice is lifted, the provider will say so plainly.

Steps to take after the notice ends

Water that was disrupted by a pressure drop, a repair, or a contamination concern can leave sediment or stale water in parts of a home. Flushing the plumbing is a practical step, and it does not require special equipment.

  1. Open the cold tap farthest from where water enters the house, and let it run until the flow is steady and clear. Repeat at each cold tap, working back toward the entry point.
  2. Run the hot water at each tap the same way. Hot water tanks can hold sediment, so if the water stays cloudy, ask a licensed plumber to drain the tank according to the manufacturer's guidance.
  3. Remove and clean faucet aerators. Screens can collect sediment, and a rinse or a light brush clears most of it.
  4. Empty the ice maker bin, discard any ice made during the notice, and run a fresh batch through the dispenser before using it.
  5. Run the dishwasher and washing machine through a full cycle, following each appliance's own guidance.
  6. Check any point-of-use filter or pitcher cartridge, and replace it if the manufacturer recommends that after a disruption.
  7. Inspect any sediment screen or filter on the main line, and change it if it is dirty.

Missouri conditions to keep in mind

Missouri spring storms, heavy rain, and flooding can affect both public systems and private wells. Winter cold can also cause pipe breaks and pressure loss in some homes, which sometimes leads to a notice. Think about what caused your notice, whether pressure, a repair, or a contamination concern, because the steps for ending it can differ. Read the notice carefully, and ask your provider or local health office if any instruction is unclear.

Keeping records and planning ahead

Write down the dates the notice started and ended, and keep a copy of the notice. Note any changes you saw in the water, such as odor, color, or taste, along with the date. A simple written record helps if you later contact your provider, a local health office, or a testing lab. Keep a supply of bottled water on hand, and learn where your water shutoff and meter are, so you can act quickly the next time a notice is issued.

If you have a private well and want to confirm the water after a notice, a laboratory test is the way to check. Ask the lab which tests fit your situation, and share your records so the sampling matches what happened at your home.