PlainWater
Counties → Massachusetts

Barnstable County, Massachusetts

Water Systems
127
Population Served
628,756
Total Violations
2,953
305 health-based
PFAS Detected
8
of 20 tested

Violation Analysis

99.2%
Systems with Violations
23.3
Avg Violations per System
10.3%
Health-Based Violations

Water Source Types

GW
49 systems (39%)
SW
1 system (1%)

PFAS Contamination

20
Systems Tested
8
PFAS Detected
40.0%
Detection Rate

PFAS (per- and polyfluoroalkyl substances) are persistent chemicals found in drinking water. The EPA has set enforceable limits for several PFAS compounds under UCMR5 monitoring.

Compliance Snapshot

Barnstable Massachusetts water systems by violation status, EPA SDWIS records.

No violations on record (0) One or more violations (50)

Violation history is cumulative, many flagged systems have already returned to compliance. Detail pages show per-system context.

Water Systems

System Name Population Violations PFAS
Falmouth Water Dept 97,551 59 Clean
Dennis Water District 65,000 44 Detected
Upper Cape Regional Water Cooperative 56,250 23 Clean
Centerville Osterville Marstons Mills WD 50,000 61 Detected
Harwich Water Department 39,144 6 Clean
Yarmouth Water Department 38,900 54 Detected
Mashpee Water District 36,922 8 Detected
Hyannis Water System, Town of Barnstable 35,000 87 Detected
Brewster Water Department 35,000 29 Clean
Chatham Water Department 30,000 85 Clean
Sandwich Water District 23,000 22 Clean
Bourne Water District 22,500 39 Detected
Provincetown Water Department 22,250 29 Clean
Orleans Water Department 18,921 40 Clean
Buzzards Bay Water District 7,700 24 Clean
Town of Eastham 6,199 1 Clean
Otis Air National Guard Base 6,000 28 Clean
Barnstable Fire District 5,400 26 Detected
Cotuit Fire District Water Department 4,938 33 Clean
North Sagamore Water District 4,668 21 Detected
Camp Favorite 1,250 26 -
Sweetwater Forest Inc 1,000 37 -
4100 Holdings LLC 750 21 -
Wellfleet Municipal Water System 750 27 -
Adventure Bound Camping, Cape Cod 660 13 -
Peters Pond Park 633 19 -
Barnstable County Jail 600 15 -
Maurices Campground Inc 600 3 -
Amari Bar and Ristorante 500 22 -
Spring Brook Center, Inc. 500 3 -
Wellfleet Commerce Center, LLC 500 19 -
Ccns Marconi Area 499 85 -
Ccns Coast Guard Station 495 29 -
Ccns Nauset Light Beach 495 15 -
Ccns Highland Area (Truro) 495 11 -
Ccns Truro Pilgrim Heights 490 8 -
YMCA Camp Lyndon 450 26 -
Adventure Bound Camping, Cc @ Hortons 438 2 -
North of Highland Camping Area, LLC 415 10 -
Chequessett Yacht Country Club 350 4 -
Ccns Doane Rock Picnic Area 320 9 -
Sandy Neck Beach 300 11 -
The Wellfleet Beachcomber 300 5 -
Blackfish Variety 300 17 -
Newcomb Hollow Beach 300 3 -
White Crest Beach 300 3 -
Maguire Landing Beach 300 3 -
Gull Pond Beach 300 2 -
Old Village Store 250 15 -
Sheraton Four Points 250 9 -

Other Counties in Massachusetts

Suffolk County
8 systems · 3,456,243 served · 111 violations
Middlesex County
204 systems · 1,623,176 served · 16,575 violations
Essex County
67 systems · 908,499 served · 3,080 violations
Norfolk County
57 systems · 842,114 served · 2,645 violations
Worcester County
345 systems · 773,172 served · 23,751 violations
Bristol County
133 systems · 673,471 served · 3,611 violations

Drinking Water Guides

Frequently Asked Questions

How many water violations are in Barnstable County? ▼
Barnstable County has 2,953 total drinking water violations across 127 water systems, of which 305 are health-based violations. 99.2% of systems have at least one violation.
How many people get water from Barnstable County systems? ▼
Water systems in Barnstable County serve approximately 628,756 people through 127 public water systems.
Has PFAS been detected in Barnstable County water? ▼
Of 20 water systems tested for PFAS in Barnstable County, 8 had PFAS detected (40.0% detection rate).
What types of water sources supply Barnstable County? ▼
Water systems in Barnstable County use GW (49 systems), SW (1 systems) as their primary water sources.
Are health-based violations serious? ▼
Health-based violations indicate that drinking water exceeded Maximum Contaminant Levels (MCLs) set by the EPA or failed treatment technique requirements. 10.3% of Barnstable County's violations are health-based. Not all violations indicate immediate health risk, but they require corrective action.
Data Sources & Methodology

Drinking water violation data from the EPA Safe Drinking Water Information System (SDWIS). PFAS testing data from the UCMR5 monitoring program. SDWIS tracks all public water systems regulated under the Safe Drinking Water Act.

Violations are categorized as health-based (Maximum Contaminant Level exceedances, treatment technique failures) or monitoring/reporting violations. Not all violations indicate an immediate health risk.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.