Winthrop Water Division, (Mwra)
PWSID: MA3346000
This system has unresolved violations related to monitoring, reporting, or procedural requirements, but none involve contaminant levels exceeding EPA health limits.
This system has more violations on record than 70% of water systems in Massachusetts.
Violation trend: 0.2 per year over the last 5 years.
System Details
| Population Served | 19,316 |
| Service Connections | 4,540 |
| Water Source | Surface Water Purchased |
| System Type | Community Water System |
| Owner | Local Government |
| Status | Active |
| City | Winthrop |
| EPA ZIP on File | 02152 |
Areas Served
- Winthrop, Suffolk County, 02152
Lead & Copper Testing
| Contaminant | Level | EPA Action Level | Status |
|---|---|---|---|
| Lead (90th percentile) | 0.0276 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0232 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0230 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0200 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0173 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0164 mg/L | 0.015 mg/L | Exceeds Action Level |
| Lead (90th percentile) | 0.0126 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0115 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0111 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0096 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0093 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0086 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0083 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0075 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0074 mg/L | 0.015 mg/L | Below Action Level |
| Lead (90th percentile) | 0.0066 mg/L | 0.015 mg/L | Below Action Level |
1 Active Violations
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5000 | MR | 2024-01-01 | Open |
Violation History (6 total)
| Contaminant | Violation | Date | Health-Based | Status |
|---|---|---|---|---|
| 5000 | TT | 2007-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 2001-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 1994-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 1993-01-01 | Yes | Returned to Compliance |
| 5000 | TT | 1992-01-01 | Yes | Returned to Compliance |
Understanding This Water System's Record
Winthrop Water Division, (Mwra) is a community water system water system that draws from surface water purchased sources and serves a population of 19,316 in Winthrop, Massachusetts. This page shows its complete compliance history as reported to the EPA's Safe Drinking Water Information System (SDWIS), the federal database that tracks every public water system in the United States.
What Do These Violations Mean?
Health-based violations mean the system exceeded an EPA maximum contaminant level (MCL) or failed to provide required treatment. These indicate potential health risks from contaminants like lead, arsenic, bacteria, nitrates, or disinfection byproducts. Non-health-based violations involve monitoring, reporting, or procedural requirements — the system missed a testing deadline or failed to notify customers, but contaminant levels were not necessarily unsafe.
What Should You Do?
Your water utility is required to publish an annual Consumer Confidence Report (CCR) that details test results and any violations. If your system has active health-based violations, consider a certified water filter rated for the specific contaminants involved. The contaminant guides on this site explain health risks and filter options for common pollutants. For the most current results, contact your water utility directly — EPA data can lag weeks or months behind real-time testing.