A flood, a heavy storm, or a long power outage can change what comes out of your taps in St. Charles, even when the water looked fine the day before. Water that backs up through drains, runs over the ground near a well, or moves through lines that lost pressure can pick up sediment, debris, and microbes. This guide covers what to check at home first, which tests make sense, and when to call for a lab sample.

Start With What You Can See and Smell

Before you test anything, make a few observations. Note whether the water is cloudy, tinted, or carrying particles. Check whether the smell has changed, and whether it is stronger on the hot or the cold side. Look at faucet screens and any cartridge housings for grit. These notes help a lab or a test kit make sense of results later.

If the water is discolored, hold off on running appliances that draw from the line, such as a washing machine or dishwasher, until the supply runs clear. Running them can spread sediment through the whole house.

Confirm Whether the Supply Was Affected

Ask a simple question first: did the event affect only your home, or the whole area? A single house with a backed-up drain may have a plumbing problem. Several homes on the same street with cloudy water may point to work on the main or a pressure drop in the system. Local water reports for St. Charles describe the tap water as hard and treated with chlorine disinfection, so you may notice a change in taste or smell after a disruption even when the water is still treated. If you are on city service, contact the water provider for notices about the event rather than relying on your own tap alone.

Test for Bacteria if You Have a Well

If your home has a private well, a flood changes the risk picture. Surface water can reach a well through runoff and through soil near the wellhead, and wells that tap the Missouri River alluvial aquifer can be influenced by river levels and surface conditions. After a flood or heavy storm, a total coliform and E. coli test is the standard first check, because these organisms are used as indicators that surface water may have reached the well. A positive result does not tell you which organism is present or where it came from. It tells you the water needs attention before anyone drinks it.

Do not wait for a lingering smell or visible cloudiness to decide. A certified lab test is the reliable way to know. While you wait for results, many homeowners use bottled or boiled water for drinking and cooking as a common precaution after a suspected contamination event.

Sampling Well Water After a Storm

  1. Use a sample bottle from a lab or a kit labeled for bacteria testing. Do not rinse it or touch the inside of the cap.
  2. Run the cold tap nearest the pressure tank briefly, then fill the bottle without splashing the cap.
  3. Fill the bottle to the line, cap it, and keep it cool while you transport it.
  4. Send it promptly, and write the date and time on the label.

Check Your Plumbing and Pressure

Water backing up through floor drains, toilets, or sink traps can carry sewage related contamination into the house plumbing. If you see this, stop using the affected fixtures and call a plumber rather than running more water through the lines. On city service, low pressure after a storm can draw dirt and sediment into household lines, and a sudden pressure drop can loosen scale that then shows up at the faucet for days.

Test for Metals and Minerals When You Have a Reason

Flood water can stir up sediment that holds iron and manganese, which show up as orange or black staining on fixtures and laundry. If you have a well, these stains may appear after a storm even if the water looked clear beforehand. A basic iron and manganese check, or a broader lab panel, can confirm them. Lead is worth testing if your home has older plumbing, since disturbed pipes and changed flow can shift what leaves the fixture. Test first, then decide on treatment.

Use Results Before You Buy Equipment

A post-flood result is a snapshot, not a verdict on the whole system. If a bacteria test comes back positive, the first step usually involves disinfecting the well and retesting, not buying a new filter. Ask the lab which parameters it recommends repeating, and whether your sample was taken after the water had time to clear. Keep your results, notes, and dates together so a later test can be compared against them.

When to Call for Help

Call a licensed well contractor if the well cap or casing looks damaged, if the pump makes unusual noises after the event, or if repeat tests stay positive. For city water, contact the provider about service notices and ask whether any flushing is recommended in your area. Keep this guide as a checklist for the next storm season.