If your tap water in Troy smells like rotten eggs, the first job is finding out where the smell starts. The odor usually comes from hydrogen sulfide, a dissolved gas that can enter water from a private well's bedrock or aquifer, build up in a water heater, or form in plumbing that sits unused for long periods. Each source calls for a different check, so it helps to narrow things down before you spend money on any fix.
Start with the hot and cold taps
Run the cold tap at the kitchen sink for a minute or two, then smell the water from a clean glass. Repeat the process with the hot tap. Pay attention to whether the smell appears on both sides or only one.
- Smell on both hot and cold: the source is likely upstream of the water heater, so look at the supply itself, whether that is a well, a pressure tank, or the incoming line.
- Smell only on the hot side: the water heater or the hot-side piping is the likely source.
- Smell that is strongest after the house sits idle overnight and fades once the water has run: stagnant water in the lines is a common pattern and is worth noting.
Why the water heater is a common suspect
Many water heaters contain an anode rod, a metal rod designed to corrode so that the tank itself is protected. Under some conditions, bacteria living in a warm tank can react with sulfate in the water and produce hydrogen sulfide. The gas can show up only at the hot tap, which is why the hot and cold comparison matters. Troy's water is very hard, so the tank may also hold scale and sediment at the bottom. Flushing the tank and inspecting the anode rod are maintenance steps a homeowner can review, and a licensed plumber can inspect the rod if it is hard to reach or if the tank is older.
If your home is on a private well
Private wells across rural Lincoln County are not regulated or tested under the Safe Drinking Water Act. That means the owner is responsible for testing. A smell is a reason to test, not a diagnosis of what is wrong.
- Ask a state-certified lab for a hydrogen sulfide test.
- Ask for coliform and E. coli bacteria testing as well, because a smell does not tell you whether bacteria are present.
- Ask for iron and manganese testing, since both are common in local geology and can accompany odor and staining.
- Take the sample from a cold tap before any treatment is installed, so the result reflects the source rather than the equipment.
Radium is another contaminant that Troy-area well owners often overlook, and it is worth asking your lab about when you order a broader panel.
Match the fix to the result
Hydrogen sulfide is a gas, and treatment methods for it differ from those used for hardness. A water softener is designed to handle hardness, not dissolved gas, so it is usually not the answer to a rotten-egg smell. Depending on the test results, the usual options involve aerating the water, using a filter designed to oxidize the gas, or disinfecting the system. If bacteria are present, disinfection needs careful handling and follow-up testing, so plan that step with a qualified service provider rather than doing it on a whim.
If the smell appears only on the hot side and the water heater check resolves it, you may not need any new equipment at all. If the smell is on both sides and the lab confirms hydrogen sulfide, treatment belongs at the point where the water enters the house, so that the whole home is covered.
Keep a simple log
Write down the date, which tap you tested, how strong the smell was, whether there is any staining or sediment, and what you changed. A short log helps a lab interpret results and gives a technician useful information before they arrive. It also shows you whether a fix is working over the following weeks, which is often the clearest sign that you found the right source.