Check Your Water Quality
Enter your ZIP code below to see real contaminant data for your area — sourced from the EWG Tap Water Database. No forms, no waiting.
Understanding Your Results
Here is what each data point means and why it matters for your household.
EWG Health Guidelines
The Environmental Working Group sets health guidelines that are often stricter than federal legal limits. These represent levels that EWG scientists consider protective of health with an adequate margin of safety, based on the latest peer-reviewed science. A contaminant can be within the legal limit but still exceed the EWG guideline.
Contaminant Levels
Each contaminant shows the detected amount, the EWG health guideline, and the federal legal limit. Green means within EWG guidelines. Amber means it exceeds the EWG guideline but is within the legal limit. Red means it exceeds the federal legal limit. The multiplier (e.g., "134x") shows how many times over the EWG guideline.
Health Categories
Contaminants are categorized by their potential health effects: Cancer, Reproductive/Developmental, Hormonal, Organ Damage, and Neurological. Use the filter buttons to focus on specific categories. These categories reflect the type of harm associated with long-term exposure, not immediate risk.
Water Source
Where your water originates shapes its characteristics. Surface water (rivers, reservoirs) tends to be softer with seasonal variability. Groundwater from deep aquifers is often harder with higher mineral content. Your utility may blend both sources depending on the season and demand.
Where does this data come from?
Contaminant data is sourced from the EWG Tap Water Database, which compiles water utility test results reported to state agencies. Data is cached for 24 hours and refreshed automatically. For Colorado ZIP codes without EWG data, we fall back to locally-sourced information from municipal Consumer Confidence Reports and EPA compliance data. For the most accurate picture of your specific home, we recommend a free point-of-use water analysis.
Want the Full Picture?
A ZIP code lookup gives you the big picture. A free home water analysis shows you exactly what reaches your tap.