F7/100
ONSET FIRE DISTRICTWATER DEPT. — Water Quality Report 2026
Serving 5,392 people · Massachusetts
Water Source
Groundwater
County
—
System ID
MA4310003
Violations
46
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
PFOS | 0.007 µg/L | 0.004 µg/L | Over Limit |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
1
Violation (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Surface water treatment technique failure
When: July 1, 2022 – August 15, 2022Enforcement: 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 ONSET FIRE DISTRICTWATER DEPT.
Is ONSET FIRE DISTRICTWATER DEPT. water safe to drink?
ONSET FIRE DISTRICTWATER DEPT. water receives a grade of F (7/100), which is considered failing. 1 contaminant(s) exceed EPA legal limits and 46 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has ONSET FIRE DISTRICTWATER DEPT. detected?
63 contaminants were tested in ONSET FIRE DISTRICTWATER DEPT.'s water. Notable contaminants include PFOS, Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does ONSET FIRE DISTRICTWATER DEPT. have any EPA violations?
Yes, ONSET FIRE DISTRICTWATER DEPT. has 46 EPA violation(s) on record, with the most recent in 2022. Violation types include Other, MR, MCL. 9 are health-based violations.
How many people does ONSET FIRE DISTRICTWATER DEPT. serve?
ONSET FIRE DISTRICTWATER DEPT. serves approximately 5,392 people, Massachusetts. The system provides water to 1 community: Wareham.
What type of water does ONSET FIRE DISTRICTWATER DEPT. provide?
ONSET FIRE DISTRICTWATER DEPT. sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MA4310003.
How does ONSET FIRE DISTRICTWATER DEPT. compare to other utilities in Massachusetts?
ONSET FIRE DISTRICTWATER DEPT. scores 7/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Massachusetts state page for a full comparison of water systems.