Enter your ZIP code to see real EPA data about contaminants, violations, and safety concerns, explained in plain English.
Safety Grade
We compute an overall water quality grade based on violations and health risks, not just legal compliance.
Health Context
Every contaminant comes with plain-English health effects, who's most at risk, and what to do.
Violation History
See every time your water exceeded legal limits or missed required testing, up to 10 years back.
Recommendations
Get specific, actionable suggestions: a filter type, a test kit, or nothing at all.
About this data: ClearWater uses the EPA's Safe Drinking Water Information System (SDWIS). Data is for public water systems only; private wells are not included. Legal limits (MCLs) are minimum standards; some contaminants may still pose health risks below legal thresholds.
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Water systems near
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MWRA
CHELSEA, MA · 2,660,000 people served · Surface Water
Data last updated: 2026-07-11
0 total violations on record. No currently active health-based violations.
Lead & Copper
| Measure | Result | EPA action level | Status | Monitoring period |
|---|---|---|---|---|
| Lead (90th percentile) | 0.0059 mg/L | 0.015 mg/L | Below action level | 2025-12-31 |
These are 90th-percentile results across sampled household taps, not a single measurement, and neither lead nor copper has a Maximum Contaminant Level. Lead reaches tap water from household plumbing rather than from the treatment plant, so a result below the action level does not guarantee your own tap is below it. Source: EPA SDWIS, Lead and Copper Rule sampling.
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MWRA: Frequently Asked Questions
Is MWRA water safe to drink?
MWRA currently has no active health-based violations and has met all EPA standards in recent years. While this indicates good water quality compliance, you may still want to consider filtering your water, especially if your home has older plumbing that may contain lead.
What violations has MWRA had?
MWRA has 0 total violations on record, but none are currently active health-based violations.
Does MWRA water have lead?
Lead in drinking water typically comes from household plumbing, not from MWRA's treatment plant. See the Lead & Copper section on this page for the most recent 90th-percentile lead test results. If your home was built before 1986, consider running cold water for 30 seconds before drinking and using an NSF/ANSI 53-certified filter.
Related water quality pages
Lead & Copper
What To Do
Violations
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