Most taste and odor issues come from a few common sources. In municipal water, chlorine is the leading cause, added during treatment to disinfect water but often leaving a noticeable taste or smell. In well water, iron is a frequent culprit, causing a metallic or bitter taste along with rust-colored staining. Hydrogen sulfide gas, which produces a rotten-egg smell, is also common in wells throughout the Mid-Atlantic. Musty or earthy flavors are typically linked to organic matter, algae, or sediment in the water source.

A water test is the most reliable way to identify the exact cause and how severe the issue is.

Yes. Certain odors can indicate potentially harmful contamination. A sewage or fecal smell may point to bacterial contamination such as E. coli. Strong chemical odors could indicate a spill, runoff, or other contamination event. Fuel-like smells, such as gasoline or diesel, may suggest issues like underground storage tank leaks.

If you notice any of these suddenly and without a clear explanation, stop drinking the tap water, switch to bottled water, and arrange for testing as soon as possible. If you’re on public water, contact your local utility to check for known issues in your area.

Yes, it’s best to test your water as soon as you notice a change. A shift in taste or odor usually means something in your water has changed, even if the cause turns out to be harmless. Water quality can vary with seasons, rainfall, and changes in the source supply, so testing promptly provides the most accurate picture of current conditions. A professional water analysis can quickly identify the issue and help determine the right solution.

Not always, but it should never be ignored. Some issues, like a mild chlorine smell or an earthy taste, are typically harmless but unpleasant. Others, such as sewage-like odors or sudden unexplained changes, may indicate contamination that poses a health risk. It’s important not to assume a long-standing taste or smell is safe. Testing is the only way to know for sure what’s in your water.

In most cases, they occur naturally. Minerals like iron and gases like hydrogen sulfide are commonly found in groundwater due to local geology. Chlorine taste comes from the municipal treatment process, and earthy or musty flavors often originate from natural organic matter in the water source.

However, household factors can sometimes contribute. Aging pipes may introduce metals like copper, and water heaters or plumbing systems can harbor sulfur bacteria that intensify odors. While homeowners are rarely the root cause, the condition of your plumbing and water system can influence what you experience at the tap.