A private well gives you direct control over your water, but nobody else checks it for you. Three complaints come up often in Missouri homes: a rotten egg odor, rust-colored staining or a metallic taste, and grit or cloudiness. Each one has different likely sources, and sorting them out is the first step before you decide on any equipment or repair.
Rotten egg odor
The smell most people describe as rotten eggs usually comes from hydrogen sulfide gas. It can come from the groundwater that feeds the well. It can also be produced by sulfate-reducing bacteria living in the well, the piping, or the water heater.
Pay attention to where the smell shows up:
- Smell in hot water only often points to the water heater, where a reaction involving the anode rod can produce the gas.
- Smell in both hot and cold water points toward the well or the groundwater itself.
- Smell that is strongest after the house has sat unused for a few days can point to bacterial activity in the plumbing.
Smell alone does not tell you the concentration or the cause. A laboratory certified for drinking water testing in Missouri can measure hydrogen sulfide and help you narrow the source.
Orange stains, rust and metallic taste
Iron is one of the most common dissolved minerals in Missouri well water. Water that looks clear when drawn can turn orange or reddish after it stands in a glass or a toilet tank, because the dissolved iron reacts with air. Manganese often appears alongside iron and can leave dark brown or black stains on fixtures and laundry.
Iron bacteria are a separate issue. They form a slimy, reddish or dark film in toilet tanks, faucet aerators and well-related fittings, and the film can return soon after cleaning. A slime that comes back is worth testing for, because the cleaning alone will not solve it.
A simple home check is to fill a clear glass, let it sit for an hour, and watch for color change or a film on the surface. Then ask the lab to test for iron and manganese.
Grit, cloudiness and sand
Sediment is solid material carried into the water. It can be fine sand, silt, or rust flakes from old pipes or a pressure tank. Many Missouri wells draw from sand, gravel or fractured rock, so sediment can show up more in some regions than others.
Fill a clear jar and let it settle. Check water from a kitchen faucet first, then from an outdoor hose bib, since the two may draw from different points. Note whether grit appears only when the pump starts, only after rain, or all the time.
Possible sources include a damaged well screen, a cracked casing or fitting, sediment built up in the pressure tank, or disturbance from recent well service. In parts of the state with karst bedrock, heavy rain can carry surface material into cracks and change what reaches the well, so sudden new sediment after a storm or flooding is a reason to test before using the water for drinking.
A simple sorting order
- Note the smell, color, or grit, and whether it appears in hot water, cold water, or both.
- Check whether a color or film develops after the water stands.
- Settle a sample in a clear jar to see if solids collect at the bottom.
- Note any change after heavy rain, a power outage, or recent pump or well work.
- Order a laboratory test that covers the complaint you see, rather than guessing at the cause.
What to ask a lab to test
- Hydrogen sulfide, for rotten egg odor
- Iron and manganese, for staining and metallic taste
- Bacteria, which is a standard part of private well testing
- Turbidity and sediment indicators, for cloudiness and grit
A test result describes what is in the water on the day it was collected. It is one useful tool, and it works best when you pair it with notes on when and where you noticed the problem.