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Community Water System · PWS MA4350000

Wrentham Water Division

Wrentham, Massachusetts 02093 - drinking water served from groundwater sources to 11,795 people, tracked in EPA SDWIS and UCMR5.

11,795
People served
125
EPA violations
49
Health-based
5 PFAS
UCMR5 result

The verdict

EPA records 125 drinking-water violations at Wrentham Water Division, 39% of them health-based - above the Massachusetts per-system average, and UCMR5 testing detected 5 PFAS compounds.

125
Total EPA violations on record
39%
Health-based (MCL / treatment failure)
11,795
People served by this system
5
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Wrentham Water Division

Wrentham Water Division is a local-owned community water system that delivers drinking water to 11,795 residents in Wrentham, Massachusetts (Norfolk County) through 4,016 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 125 total violations for this system , of which 49 (39%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 68 monitoring and reporting violations are on file. The most recent violation on record dates to 2015.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 49 violations (MCL, health-based). Under EPA's UCMR5 PFAS monitoring program, 5 PFAS compounds were detected in samples collected from this system, with a maximum reported concentration of 5.9 ppt (parts per trillion). PFAS are persistent synthetic chemicals linked to health effects at very low exposure levels.

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%).

Wrentham Water Division's 125 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.

PFAS Detected

5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
11,795
Total Violations
125
Health-Based Violations
49
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
4,016
County
Norfolk
School/Daycare
No
MCL Violations
49
Monitoring Violations
68
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 49 2014
Lead and Copper Rule MR 7 2015
Coliform (TCR) MR 4 2012
Consumer Confidence Rule Other 2 2015
BHC-GAMMA MR 1 2005
Total Polychlorinated Biphenyls (PCB) MR 1 2005
1,2-DIBROMO-3-CHLOROPROPANE MR 1 2005
Dalapon MR 1 2005
Atrazine MR 1 2005
Di(2-ethylhexyl) phthalate MR 1 2005
Diquat MR 1 2005
Glyphosate MR 1 2005
Hexachlorocyclopentadiene MR 1 2005
Picloram MR 1 2005
Simazine MR 1 2005
2,3,7,8-TCDD MR 1 2005
Carbon tetrachloride MR 1 2005
1,1-Dichloroethylene MR 1 2005
Trichloroethylene MR 1 2005
CHLOROBENZENE MR 1 2005
o-Dichlorobenzene MR 1 2005
trans-1,2-Dichloroethylene MR 1 2005
cis-1,2-Dichloroethylene MR 1 2005
2,4-D MR 1 2005
Ethylbenzene MR 1 2005
Styrene MR 1 2005
Toluene MR 1 2005
p-Dichlorobenzene MR 1 2005
Xylenes, Total MR 1 2005
DICHLOROMETHANE MR 1 2005

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 8 of 174 samples detected PFAS.

Contaminant Date Result MRL Status
PFPeA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
PFBA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
HFPO-DA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFHxA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFTA 8/17/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 8/17/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/17/2023 <6.00 ppt 6.00 ppt Not Detected
NFDHA 8/17/2023 <20.00 ppt 20.00 ppt Not Detected
PFOA 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFOS 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
9Cl-PF3ONS 8/17/2023 <2.00 ppt 2.00 ppt Not Detected
PFDA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 8/17/2023 <2.00 ppt 2.00 ppt Not Detected
11Cl-PF3OUdS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFNA 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 8/17/2023 3.10 ppt 3.00 ppt Detected
HFPO-DA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 8/17/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 8/17/2023 <4.00 ppt 4.00 ppt Not Detected
PFHpS 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
ADONA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 8/17/2023 <7.00 ppt 7.00 ppt Not Detected
PFHxA 8/17/2023 3.20 ppt 3.00 ppt Detected
NEtFOSAA 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
NMeFOSAA 8/17/2023 <6.00 ppt 6.00 ppt Not Detected
PFTA 8/17/2023 <8.00 ppt 8.00 ppt Not Detected
PFHpA 8/17/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 8/17/2023 <5.00 ppt 5.00 ppt Not Detected
9Cl-PF3ONS 8/17/2023 <2.00 ppt 2.00 ppt Not Detected

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 Wrentham Water Division.

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 MA4350000 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 Wrentham Water Division 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
2015 Lead and Copper Rule MR 7 SDWIS / MA4350000 / 5000
2015 Consumer Confidence Rule Other 2 SDWIS / MA4350000 / 7000
2014 Coliform (TCR) MCL 49 SDWIS / MA4350000 / 3100
2012 Coliform (TCR) MR 4 SDWIS / MA4350000 / 3100
2005 BHC-GAMMA MR 1 SDWIS / MA4350000 / 2010
2005 Total Polychlorinated Biphenyls (PCB) MR 1 SDWIS / MA4350000 / 2383
2005 1,2-DIBROMO-3-CHLOROPROPANE MR 1 SDWIS / MA4350000 / 2931
2005 Dalapon MR 1 SDWIS / MA4350000 / 2031
2005 Atrazine MR 1 SDWIS / MA4350000 / 2050
2005 Di(2-ethylhexyl) phthalate MR 1 SDWIS / MA4350000 / 2039
2005 Diquat MR 1 SDWIS / MA4350000 / 2032
2005 Glyphosate MR 1 SDWIS / MA4350000 / 2034
2005 Hexachlorocyclopentadiene MR 1 SDWIS / MA4350000 / 2042
2005 Picloram MR 1 SDWIS / MA4350000 / 2040
2005 Simazine MR 1 SDWIS / MA4350000 / 2037

How Wrentham Water Division Compares

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

Metric Wrentham Water Division Massachusetts avg Federal benchmark
Total violations 125 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 49 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection 5 compounds 56.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 11,795 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 Wrentham Water Division water safe to drink? ▼
Wrentham Water Division (PWS ID: MA4350000) has 125 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 5 PFAS compounds found. This system serves 11,795 people using Groundwater sources.
How many people does Wrentham Water Division serve? ▼
Wrentham Water Division serves 11,795 people in Wrentham, Massachusetts. It is a Local-owned system using Groundwater water sources with 4,016 service connections.
What type of violations does Wrentham Water Division have? ▼
Wrentham Water Division has 125 total violations: 49 health-based violations (MCL exceedances or treatment failures), 68 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Wrentham Water Division water? ▼
Yes. UCMR5 testing detected 5 PFAS compounds in Wrentham Water Division's water supply: PFPeA, PFHxA, PFOS, PFOA, PFBS. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Wrentham Water Division use? ▼
Wrentham Water Division 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. PFAS data from EPA UCMR5 monitoring program (2023-2025). 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.