Know What’s In Your Tap Water.
Before It Reaches Your Glass.
EPA compliance records for 7,929 public water systems, with sources and guidance for checking your own supply.
Identify Tap Water Symptoms
Match physical taste, odor, or plumbing observations with EPA-regulated contaminants.
Choose a Filter for a Documented Contaminant
A standard number alone does not prove that a specific model removes every contaminant. Check the model's certified reduction claim and compare it with your utility report or a test from an accredited laboratory.
Read the filter guide →Selected EPA Violation Records
Historical EPA records can lag local events. Ask your utility about current conditions.
Top Cleanest States
View All →Popular Tap Water Comparisons
Compare contaminant profiles and compliance records between major US metropolitan areas.
Water Intelligence That Ends in an Action
WaterQ pulls drinking water quality records from the U.S. EPA's Safe Drinking Water Information System (SDWIS) for over 7,929 public water systems across all 50 states. Every report ends in actionable guidance: source records and options for checking contaminants or filter certification.
Our scoring model combines contaminant detection thresholds, EPA Maximum Contaminant Level (MCL) compliance data, and violation histories into a standardized 0–100 score. The underlying compliance records come from EPA data releases.
Frequently Asked Questions
Can WaterQ tell me whether my tap water is safe today?
WaterQ summarizes historical EPA compliance records. Those records do not confirm current conditions at your tap. Check your utility's latest Consumer Confidence Report and any current local advisory.
Where does WaterQ obtain drinking water data?
WaterQ analyzes U.S. EPA Safe Drinking Water Information System records. Its summaries identify the public water systems and records behind available scores.
How should I choose a filter for lead or PFAS?
Check the specific model's certified contaminant reduction claim. NSF/ANSI 53 or 58 on its own does not mean every model is certified for both lead and PFAS.
What should I do during a boil water advisory?
Follow the instructions from your local water utility or health department. WaterQ does not publish or verify live boil water advisories.
How often are WaterQ records refreshed?
WaterQ processes periodic EPA data releases. The underlying records can lag local events, so confirm current conditions with your utility.
Pure Data. Clear Next Step.
Sourced directly from the EPA Safe Drinking Water Information System with third-party verified filtration recommendations.