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Community Water System · PWS MA4318094

Wellfleet Municipal Water System

Wellfleet, Massachusetts 02667 - drinking water served from groundwater sources to 750 people, tracked in EPA SDWIS and UCMR5.

750
People served
27
EPA violations
10
Health-based
Untested
UCMR5 result

The verdict

EPA records 27 drinking-water violations at Wellfleet Municipal Water System, 37% of them health-based - below the Massachusetts per-system average.

27
Total EPA violations on record
37%
Health-based (MCL / treatment failure)
750
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Wellfleet Municipal Water System

Wellfleet Municipal Water System is a local-owned community water system that delivers drinking water to 750 residents in Wellfleet, Massachusetts (Barnstable County) through 259 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 27 total violations for this system , of which 10 (37%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 8 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 6 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Massachusetts, EPA tracks 1,599 public water systems serving 10,332,845 people, with 73,886 cumulative violations and 7,389 health-based violations on record. About 95% of systems in the state carry at least one violation, and state-wide the average per system is 46.2 violations. Statewide, 148 of 263 UCMR5-tested systems have reported PFAS detections (56.3%).

Wellfleet Municipal Water System's 27 violations sit below the Massachusetts average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
750
Total Violations
27
Health-Based Violations
10
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
259
County
Barnstable
School/Daycare
No
MCL Violations
8
Monitoring Violations
8
Treatment Tech Violations
2

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 6 2011
Lead and Copper Rule MR 4 1993
Revised Total Coliform Rule MCL 2 2020
Nitrate MR 2 1995
Revised Total Coliform Rule RPT 2 2020
Lead and Copper Rule TT 2 1993
Public Notice Other 2 2020
Nitrite MR 1 1995
Coliform (TCR) MR 1 1992

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Wellfleet Municipal Water System.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID MA4318094 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Massachusetts Drinking Water Authority

MassDEP, Drinking Water Program is the primacy agency that licenses and inspects Wellfleet Municipal Water System under EPA-delegated authority.

Open MA regulator portal

Source: MassDEP, Drinking Water Program

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Revised Total Coliform Rule MCL 2 SDWIS / MA4318094 / 8000
2020 Revised Total Coliform Rule RPT 2 SDWIS / MA4318094 / 8000
2020 Public Notice Other 2 SDWIS / MA4318094 / 7500
2011 Coliform (TCR) MCL 6 SDWIS / MA4318094 / 3100
1995 Nitrate MR 2 SDWIS / MA4318094 / 1040
1995 Nitrite MR 1 SDWIS / MA4318094 / 1041
1993 Lead and Copper Rule MR 4 SDWIS / MA4318094 / 5000
1993 Lead and Copper Rule TT 2 SDWIS / MA4318094 / 5000
1992 Coliform (TCR) MR 1 SDWIS / MA4318094 / 3100

How Wellfleet Municipal Water System Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Wellfleet Municipal Water System Massachusetts avg Federal benchmark
Total violations 27 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 10 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 56.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 750 6,462 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,599 regulated public water systems in Massachusetts.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Wellfleet Municipal Water System water safe to drink? ▼
Wellfleet Municipal Water System (PWS ID: MA4318094) has 27 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 750 people using Groundwater sources.
How many people does Wellfleet Municipal Water System serve? ▼
Wellfleet Municipal Water System serves 750 people in Wellfleet, Massachusetts. It is a Local-owned system using Groundwater water sources with 259 service connections.
What type of violations does Wellfleet Municipal Water System have? ▼
Wellfleet Municipal Water System has 27 total violations: 10 health-based violations (MCL exceedances or treatment failures), 8 monitoring/reporting violations, and 2 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Wellfleet Municipal Water System water? ▼
No PFAS testing data is available for Wellfleet Municipal Water System under the EPA's UCMR5 monitoring program.
What water source does Wellfleet Municipal Water System use? ▼
Wellfleet Municipal Water System uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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 system's figures are rendered directly from 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.