D31/100
HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE — Water Quality Report 2026
Serving 35,000 people · Massachusetts
Water Source
Groundwater
County
—
System ID
MA4020004
Violations
42
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
1,4-dioxane | 0.370 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2017.
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 HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE
Is HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE water safe to drink?
HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE water receives a grade of D (31/100), which is considered poor. 0 contaminant(s) exceed EPA legal limits and 42 violation(s) are on record. Customers may want to consider using a water filter.
What contaminants has HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE detected?
66 contaminants were tested in HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE's water. Notable contaminants include 1,4-dioxane. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE have any EPA violations?
Yes, HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE has 42 EPA violation(s) on record, with the most recent in 2017. Violation types include Other, MR, MCL. 6 are health-based violations.
How many people does HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE serve?
HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE serves approximately 35,000 people, Massachusetts. The system provides water to 1 community: Barnstable.
What type of water does HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE provide?
HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MA4020004.
How does HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE compare to other utilities in Massachusetts?
HYANNIS WATER SYSTEM, TOWN OF BARNSTABLE scores 31/100 with a grade of D (poor). This score suggests significant water quality concerns relative to other utilities. Visit our Massachusetts state page for a full comparison of water systems.