Guides

• What EPA's Water Data Doesn't Cover — The gap between a water system's EPA record and what actually comes out of your tap.
• How to Read a "No Violations" Record — Why a clean EPA violation record means different things depending on system size.
• What Filter Actually Addresses Each Kind of Violation — EPA's violation labels name a rule or a chemical, not a filter. Here's what each concern category actually calls for.
• Why Lead Violations Get Treated as the Most Urgent Category — Lead has no safe exposure threshold and comes from plumbing, not the treated water - why this site ranks it above every other concern category.