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Community Water System · PWS MA2153000

Leominster Water Division

Leominster, Massachusetts 01453 - drinking water served from surface water sources to 41,683 people, tracked in EPA SDWIS and UCMR5.

41,683
People served
345
EPA violations
27
Health-based
1 PFAS
UCMR5 result

The verdict

EPA records 345 drinking-water violations at Leominster Water Division, 8% of them health-based - above the Massachusetts per-system average, and UCMR5 testing detected 1 PFAS compound.

345
Total EPA violations on record
8%
Health-based (MCL / treatment failure)
41,683
People served by this system
1
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Leominster Water Division

Leominster Water Division is a local-owned community water system that delivers drinking water to 41,683 residents in Leominster, Massachusetts (Worcester County) through 13,553 service connections. Its water is drawn from surface water sources. EPA's Safe Drinking Water Information System records 345 total violations for this system , of which 27 (8%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 285 monitoring and reporting violations are on file. The most recent violation on record dates to 2018.

The most frequently cited contaminant at this system is Surface Water Treatment Rule, recorded in 115 violations (MR). Under EPA's UCMR5 PFAS monitoring program, 1 PFAS compound was detected in samples collected from this system, with a maximum reported concentration of 4.3 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%).

Leominster Water Division's 345 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

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

Population Served
41,683
Total Violations
345
Health-Based Violations
27
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
13,553
County
Worcester
School/Daycare
No
MCL Violations
19
Monitoring Violations
285
Treatment Tech Violations
8

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Surface Water Treatment Rule MR 115 2017
TTHM MCL 11 2007
Surface Water Treatment Rule TT 6 2005
Public Notice Other 6 2005
Consumer Confidence Rule Other 4 2008
1,2,4-Trichlorobenzene MR 4 2004
o-Dichlorobenzene MR 4 2004
1,1-Dichloroethylene MR 4 2004
trans-1,2-Dichloroethylene MR 4 2004
1,2-Dichloroethane MR 4 2004
Trichloroethylene MR 4 2004
Toluene MR 4 2004
Styrene MR 4 2004
Coliform (TCR) MCL 4 2012
Total Haloacetic Acids (HAA5) MCL 4 2018
cis-1,2-Dichloroethylene MR 4 2004
Xylenes, Total MR 4 2004
DICHLOROMETHANE MR 4 2004
Vinyl chloride MR 4 2004
1,1,1-Trichloroethane MR 4 2004
1,2-Dichloropropane MR 4 2004
Tetrachloroethylene MR 4 2004
CHLOROBENZENE MR 4 2004
Benzene MR 4 2004
Ethylbenzene MR 4 2004
Carbon tetrachloride MR 4 2004
1,1,2-Trichloroethane MR 4 2004
p-Dichlorobenzene MR 4 2004
Arsenic MR 2 2002
Chromium MR 2 2002

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 1 of 406 samples detected PFAS.

Contaminant Date Result MRL Status
HFPO-DA 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFTA 9/19/2023 <8.00 ppt 8.00 ppt Not Detected
PFTrDA 9/19/2023 <7.00 ppt 7.00 ppt Not Detected
NEtFOSAA 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFBS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 9/19/2023 <2.00 ppt 2.00 ppt Not Detected
PFEESA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFHpS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
NMeFOSAA 9/19/2023 <6.00 ppt 6.00 ppt Not Detected
6:2 FTS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 9/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFPeS 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFMBA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFBA 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
9Cl-PF3ONS 9/19/2023 <2.00 ppt 2.00 ppt Not Detected
NMeFOSAA 9/19/2023 <6.00 ppt 6.00 ppt Not Detected
4:2 FTS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
8:2 FTS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFMPA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFPeA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFMBA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFEESA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 9/19/2023 <20.00 ppt 20.00 ppt Not Detected
PFTrDA 9/19/2023 <7.00 ppt 7.00 ppt Not Detected
PFHpS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
NEtFOSAA 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
6:2 FTS 9/19/2023 <5.00 ppt 5.00 ppt Not Detected
PFDA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFPeS 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFBS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 9/19/2023 <4.00 ppt 4.00 ppt Not Detected
PFHxA 9/19/2023 <3.00 ppt 3.00 ppt Not Detected
PFOS 9/19/2023 <4.00 ppt 4.00 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 Leominster 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 MA2153000 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 Leominster 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
2018 Total Haloacetic Acids (HAA5) MCL 4 SDWIS / MA2153000 / 2456
2017 Surface Water Treatment Rule MR 115 SDWIS / MA2153000 / 0200
2012 Coliform (TCR) MCL 4 SDWIS / MA2153000 / 3100
2008 Consumer Confidence Rule Other 4 SDWIS / MA2153000 / 7000
2007 TTHM MCL 11 SDWIS / MA2153000 / 2950
2005 Surface Water Treatment Rule TT 6 SDWIS / MA2153000 / 0200
2005 Public Notice Other 6 SDWIS / MA2153000 / 7500
2004 1,2,4-Trichlorobenzene MR 4 SDWIS / MA2153000 / 2378
2004 o-Dichlorobenzene MR 4 SDWIS / MA2153000 / 2968
2004 1,1-Dichloroethylene MR 4 SDWIS / MA2153000 / 2977
2004 trans-1,2-Dichloroethylene MR 4 SDWIS / MA2153000 / 2979
2004 1,2-Dichloroethane MR 4 SDWIS / MA2153000 / 2980
2004 Trichloroethylene MR 4 SDWIS / MA2153000 / 2984
2004 Toluene MR 4 SDWIS / MA2153000 / 2991
2004 Styrene MR 4 SDWIS / MA2153000 / 2996

How Leominster Water Division Compares

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

Metric Leominster Water Division Massachusetts avg Federal benchmark
Total violations 345 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 27 4.6 Indicates a contaminant exceeded a federal MCL
PFAS detection 1 compound 56.3% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 41,683 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 Leominster Water Division water safe to drink? ▼
Leominster Water Division (PWS ID: MA2153000) has 345 recorded violations in the EPA SDWIS database. PFAS contamination has been detected in UCMR5 testing, with 1 PFAS compound found. This system serves 41,683 people using Surface Water sources.
How many people does Leominster Water Division serve? ▼
Leominster Water Division serves 41,683 people in Leominster, Massachusetts. It is a Local-owned system using Surface Water water sources with 13,553 service connections.
What type of violations does Leominster Water Division have? ▼
Leominster Water Division has 345 total violations: 27 health-based violations (MCL exceedances or treatment failures), 285 monitoring/reporting violations, and 8 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Leominster Water Division water? ▼
Yes. UCMR5 testing detected 1 PFAS compound in Leominster Water Division's water supply: PFOA. PFAS are persistent "forever chemicals" that do not break down in the environment.
What water source does Leominster Water Division use? ▼
Leominster Water Division uses Surface Water 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.