Common Water Contaminants Found in Home Drinking Water

In Grosse Pointe and across Michigan you’ll see a mix of legacy and newer contaminants shaped by older pipes, local land use, and how utilities treat water. Lead is still a risk where older service lines or fittings remain. PFAS show up near industrial sites and places where firefighting foam was used, and statewide monitoring has detected PFAS in some areas. Hard water is common in Southeast Michigan and causes scale and appliance wear. Microplastics are increasingly detectable in many systems, though their health effects are still under study. Your utility’s Consumer Confidence Report and recent state regulatory changes should help set testing priorities — if you live in an older house or near known sources, prioritize lead, PFAS, and biological testing.

Because many chemical contaminants are invisible, sensory checks aren’t enough — matched lab testing or certified filters are the reliable way to find and reduce these risks.

Use this comparison to match what you observe at the tap with the right tests and the urgency of any fixes.

Look for visible, smell, taste, and plumbing clues — these are often the first hints that water needs attention. Early signs include odd taste or odor, discoloration, staining on fixtures or laundry, and sediment or particles in clear water. Less obvious indicators are rapid corrosion of fixtures, frequent faucet problems, or unexplained appliance damage. Spotting these signs quickly helps you decide whether a point-of-use filter will do or if you need whole-house treatment or plumbing repairs. The list below summarizes common signals and sensible immediate actions.

Common observable signs and immediate actions:

After you notice these signs, collect a chilled sample per kit or lab instructions or call a professional for certified sampling — sensory cues alone cannot quantify risk.

Start simple: compare cold versus hot water, run taps after the water has been sitting, and check several faucets to see if the issue is localized. A metallic taste or blue-green staining points to corrosion and possible lead or copper. Brown or reddish water usually means disturbed iron or manganese from the mains or corroded pipes. Chlorine odor indicates disinfectant residuals, and a rotten-egg smell suggests hydrogen sulfide or certain bacteria. Document what you see — flush for a few minutes, note which fixtures are affected, and photograph stains — then preserve a cold-water sample for testing. Those observations help decide whether to order a focused panel (lead, iron, bacteria) or a broader screen (PFAS, nitrates).

Knowing where and when the issue shows up helps determine whether the source is your plumbing, the water main, or the utility system — and that changes the remediation path.

Acute health symptoms such as nausea, vomiting, diarrhea, or fever after drinking tap water commonly point to bacterial contamination and require immediate action: stop drinking the water and seek medical care if symptoms are severe. Chronic problems — like developmental issues from long-term lead exposure or immune effects linked to PFAS — are less obvious but still urgent to investigate when you have reasons to suspect exposure. Plumbing signals that suggest a systemic problem include ongoing corrosion, sudden pressure changes, and repeated fixture failures due to buildup; these issues can both indicate and worsen contaminant release. If people in the home become ill or multiple fixtures show corrosion and discoloration, contact a licensed plumber to arrange certified testing and a system evaluation.