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Community Water System · PWS MA2179001

Mendon Housing Authority

Mendon, Massachusetts 01756 - drinking water served from groundwater sources to 31 people, tracked in EPA SDWIS and UCMR5.

31
People served
130
EPA violations
7
Health-based
Untested
UCMR5 result

The verdict

EPA records 130 drinking-water violations at Mendon Housing Authority, 5% of them health-based - above the Massachusetts per-system average.

130
Total EPA violations on record
5%
Health-based (MCL / treatment failure)
31
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mendon Housing Authority

Mendon Housing Authority is a state-owned community water system that delivers drinking water to 31 residents in Mendon, Massachusetts (Worcester County) through 6 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 130 total violations for this system , of which 7 (5%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 113 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 8 violations (MR). 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, 143 of 263 UCMR5-tested systems have reported PFAS detections (54.4%).

Mendon Housing Authority's 130 violations sit above 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
31
Total Violations
130
Health-Based Violations
7
Water Source
Groundwater

System Details

System Type
Community
Owner Type
State
Connections
6
County
Worcester
School/Daycare
No
MCL Violations
7
Monitoring Violations
113
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MR 8 2013
Lead and Copper Rule MR 8 2020
Coliform (TCR) MCL 7 2015
Benzene MR 4 2008
1,1-Dichloroethylene MR 4 2008
1,2-Dichloroethane MR 4 2008
Trichloroethylene MR 4 2008
1,1,1-Trichloroethane MR 4 2008
o-Dichlorobenzene MR 4 2008
CHLOROBENZENE MR 4 2008
trans-1,2-Dichloroethylene MR 4 2008
cis-1,2-Dichloroethylene MR 4 2008
1,2-Dichloropropane MR 4 2008
Ethylbenzene MR 4 2008
Tetrachloroethylene MR 4 2008
Toluene MR 4 2008
Xylenes, Total MR 4 2008
DICHLOROMETHANE MR 4 2008
1,1,2-Trichloroethane MR 4 2008
Vinyl chloride MR 4 2008
Carbon tetrachloride MR 4 2008
Styrene MR 4 2008
p-Dichlorobenzene MR 4 2008
1,2,4-Trichlorobenzene MR 4 2008
Nitrate MR 2 1994
Radium-226 MR 2 1995
Gross Beta Particle Activity MR 2 1995
Tritium MR 2 1995
38-STRONTIUM-90 MR 2 1995
Radium-228 MR 2 1995

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 Mendon Housing Authority.

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 MA2179001 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 Mendon Housing Authority 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 Lead and Copper Rule MR 8 SDWIS / MA2179001 / 5000
2018 Revised Total Coliform Rule RPT 1 SDWIS / MA2179001 / 8000
2015 Coliform (TCR) MCL 7 SDWIS / MA2179001 / 3100
2013 Coliform (TCR) MR 8 SDWIS / MA2179001 / 3100
2008 Benzene MR 4 SDWIS / MA2179001 / 2990
2008 1,1-Dichloroethylene MR 4 SDWIS / MA2179001 / 2977
2008 1,2-Dichloroethane MR 4 SDWIS / MA2179001 / 2980
2008 Trichloroethylene MR 4 SDWIS / MA2179001 / 2984
2008 1,1,1-Trichloroethane MR 4 SDWIS / MA2179001 / 2981
2008 o-Dichlorobenzene MR 4 SDWIS / MA2179001 / 2968
2008 CHLOROBENZENE MR 4 SDWIS / MA2179001 / 2989
2008 trans-1,2-Dichloroethylene MR 4 SDWIS / MA2179001 / 2979
2008 cis-1,2-Dichloroethylene MR 4 SDWIS / MA2179001 / 2380
2008 1,2-Dichloropropane MR 4 SDWIS / MA2179001 / 2983
2008 Ethylbenzene MR 4 SDWIS / MA2179001 / 2992

How Mendon Housing Authority Compares

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

Metric Mendon Housing Authority Massachusetts avg Federal benchmark
Total violations 130 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 7 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection None 54.4% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 31 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 Mendon Housing Authority water safe to drink? ▼
Mendon Housing Authority (PWS ID: MA2179001) has 130 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 31 people using Groundwater sources.
How many people does Mendon Housing Authority serve? ▼
Mendon Housing Authority serves 31 people in Mendon, Massachusetts. It is a State-owned system using Groundwater water sources with 6 service connections.
What type of violations does Mendon Housing Authority have? ▼
Mendon Housing Authority has 130 total violations: 7 health-based violations (MCL exceedances or treatment failures), 113 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mendon Housing Authority water? ▼
No PFAS testing data is available for Mendon Housing Authority under the EPA's UCMR5 monitoring program.
What water source does Mendon Housing Authority use? ▼
Mendon Housing Authority 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.