Educational decision aid
Turn what you notice into a safer next step.
This finder organizes observations and testing questions. It cannot diagnose contamination or determine that water is safe.
Next steps
Important: A symptom is a clue, not a safety test. Use a state-certified drinking-water laboratory and local health or environmental guidance for safety decisions.
Before buying equipment
Bring evidence to the decision.
Record where and when the issue occurs, preserve laboratory reports and compare treatment claims with the identified contaminant, concentration, water chemistry and household flow.