C55/100
WINTHROP WATER DIVISION, (MWRA) — Water Quality Report 2026
Serving 19,316 people · Massachusetts
Water Source
Purchased Surface Water
County
—
System ID
MA3346000
Violations
10
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.008 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: January 1, 2024Rule: Ground Water RuleEnforcement: Formal — state order issued
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 WINTHROP WATER DIVISION, (MWRA)
Is WINTHROP WATER DIVISION, (MWRA) water safe to drink?
WINTHROP WATER DIVISION, (MWRA) water receives a grade of C (55/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 10 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WINTHROP WATER DIVISION, (MWRA) detected?
69 contaminants were tested in WINTHROP WATER DIVISION, (MWRA)'s water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WINTHROP WATER DIVISION, (MWRA) have any EPA violations?
Yes, WINTHROP WATER DIVISION, (MWRA) has 10 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, MCL, TT. 8 are health-based violations.
How many people does WINTHROP WATER DIVISION, (MWRA) serve?
WINTHROP WATER DIVISION, (MWRA) serves approximately 19,316 people, Massachusetts. The system provides water to 1 community: Winthrop.
What type of water does WINTHROP WATER DIVISION, (MWRA) provide?
WINTHROP WATER DIVISION, (MWRA) sources its water from purchased surface water. Surface water comes from rivers, lakes, or reservoirs and typically requires more extensive treatment. The utility's system ID is MA3346000.
How does WINTHROP WATER DIVISION, (MWRA) compare to other utilities in Massachusetts?
WINTHROP WATER DIVISION, (MWRA) scores 55/100 with a grade of C (fair). This score indicates room for improvement compared to other utilities. Visit our Massachusetts state page for a full comparison of water systems.