C47/100
WILMINGTON WATER DEPT — Water Quality Report 2026
Serving 22,481 people · Massachusetts
Water Source
Purchased Surface Water
County
—
System ID
MA3342000
Violations
30
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Lead (90th percentile) | 0.002 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
1
Health-Related
TIER 1 — URGENTResolved
Maximum Contaminant Level Violation
When: September 1, 2022 – September 30, 2022Rule: Total Coliform 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 WILMINGTON WATER DEPT
Is WILMINGTON WATER DEPT water safe to drink?
WILMINGTON WATER DEPT water receives a grade of C (47/100), which is considered fair. 0 contaminant(s) exceed EPA legal limits and 30 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has WILMINGTON WATER DEPT detected?
69 contaminants were tested in WILMINGTON WATER DEPT's water. Notable contaminants include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does WILMINGTON WATER DEPT have any EPA violations?
Yes, WILMINGTON WATER DEPT has 30 EPA violation(s) on record, with the most recent in 2022. Violation types include MCL, MR, TT. 5 are health-based violations.
How many people does WILMINGTON WATER DEPT serve?
WILMINGTON WATER DEPT serves approximately 22,481 people, Massachusetts. The system provides water to 1 community: Wilmington.
What type of water does WILMINGTON WATER DEPT provide?
WILMINGTON WATER DEPT 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 MA3342000.
How does WILMINGTON WATER DEPT compare to other utilities in Massachusetts?
WILMINGTON WATER DEPT scores 47/100 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.