A90/100
MWRA — Water Quality Report 2026
Serving 2,660,000 people · Massachusetts
Water Source
Surface Water
County
—
System ID
MA6000000
Violations
3
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.006 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2001.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Frequently Asked Questions About MWRA
Is MWRA water safe to drink?
MWRA water receives a grade of A (90/100), which is considered excellent. Out of 1 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has MWRA detected?
1 contaminants were tested in MWRA's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does MWRA have any EPA violations?
Yes, MWRA has 3 EPA violation(s) on record, with the most recent in 2001. Violation types include MR, TT. 1 are health-based violations.
How many people does MWRA serve?
MWRA serves approximately 2,660,000 people, Massachusetts. The system provides water to 1 community: Boston.
What type of water does MWRA provide?
MWRA sources its water from surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MA6000000.
How does MWRA compare to other utilities in Massachusetts?
MWRA scores 90/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Massachusetts state page for a full comparison of water systems.