Community Water System · PWS MA1340000

Williamsburg Water Dept

Haydenville, Massachusetts 01039 - drinking water served from groundwater sources to 1,575 people, tracked in EPA SDWIS and UCMR5.

Compiled by PlainWater Editorial, Drinking Water Quality Editorial Team · May 15, 2026

1,575
People served: 97
EPA violations: 15
Health-based: Untested
UCMR5 result

The verdict

EPA records 97 drinking-water violations at Williamsburg Water Dept, 15% of them health-based - above the Massachusetts per-system average.

97
Total EPA violations on record: 15%
Health-based (MCL / treatment failure): 1,575
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Williamsburg Water Dept

Williamsburg Water Dept is a local-owned community water system that delivers drinking water to 1,575 residents in Haydenville, Massachusetts (Hampshire County) through 571 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 97 total violations for this system , of which 15 (15%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 51 monitoring and reporting violations are on file. The most recent violation on record dates to 2019.

The most frequently cited contaminant at this system is Coliform (TCR), recorded in 15 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%).

Williamsburg Water Dept's 97 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

1,575

Total Violations

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Community
Owner Type: Local
Connections: 571
County: Hampshire
School/Daycare: No
MCL Violations: 15
Monitoring Violations: 51
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Coliform (TCR)	MCL	15	2015
Revised Total Coliform Rule	MON	8	2019
Coliform (TCR)	MR	4	2015
Nitrate	MR	4	2006
Radium-226	MR	3	2015
Radium-228	MR	3	2015
Gross Beta Particle Activity	MR	2	2001
38-STRONTIUM-90	MR	2	2001
Coliform (TCR)	Other	2	2018
Tritium	MR	2	2001
1,2,4-Trichlorobenzene	MR	1	2001
cis-1,2-Dichloroethylene	MR	1	2001
DICHLOROMETHANE	MR	1	2001
o-Dichlorobenzene	MR	1	2001
Vinyl chloride	MR	1	2001
1,1-Dichloroethylene	MR	1	2001
trans-1,2-Dichloroethylene	MR	1	2001
1,1,1-Trichloroethane	MR	1	2001
Carbon tetrachloride	MR	1	2001
Trichloroethylene	MR	1	2001
Tetrachloroethylene	MR	1	2001
CHLOROBENZENE	MR	1	2001
Toluene	MR	1	2001
Styrene	MR	1	2001
p-Dichlorobenzene	MR	1	2001
Gross Alpha, Excl. Radon and U	MR	1	2015
1,2-Dichloroethane	MR	1	2001
1,2-Dichloropropane	MR	1	2001
Lead and Copper Rule	MR	1	2008
1,1,2-Trichloroethane	MR	1	2001

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 Williamsburg Water Dept.

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 MA1340000 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 Williamsburg Water Dept 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
2019	Revised Total Coliform Rule	MON	8	SDWIS / MA1340000 / 8000
2018	Coliform (TCR)	Other	2	SDWIS / MA1340000 / 3100
2015	Coliform (TCR)	MCL	15	SDWIS / MA1340000 / 3100
2015	Coliform (TCR)	MR	4	SDWIS / MA1340000 / 3100
2015	Radium-226	MR	3	SDWIS / MA1340000 / 4020
2015	Radium-228	MR	3	SDWIS / MA1340000 / 4030
2015	Gross Alpha, Excl. Radon and U	MR	1	SDWIS / MA1340000 / 4000
2008	Lead and Copper Rule	MR	1	SDWIS / MA1340000 / 5000
2006	Nitrate	MR	4	SDWIS / MA1340000 / 1040
2001	Gross Beta Particle Activity	MR	2	SDWIS / MA1340000 / 4100
2001	38-STRONTIUM-90	MR	2	SDWIS / MA1340000 / 4174
2001	Tritium	MR	2	SDWIS / MA1340000 / 4102
2001	1,2,4-Trichlorobenzene	MR	1	SDWIS / MA1340000 / 2378
2001	cis-1,2-Dichloroethylene	MR	1	SDWIS / MA1340000 / 2380
2001	DICHLOROMETHANE	MR	1	SDWIS / MA1340000 / 2964

How Williamsburg Water Dept Compares

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

Metric	Williamsburg Water Dept	Massachusetts avg	Federal benchmark
Total violations	97	46.2	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	15	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	1,575	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 Williamsburg Water Dept water safe to drink? ▼

Williamsburg Water Dept (PWS ID: MA1340000) has 97 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,575 people using Groundwater sources.

How many people does Williamsburg Water Dept serve? ▼

Williamsburg Water Dept serves 1,575 people in Haydenville, Massachusetts. It is a Local-owned system using Groundwater water sources with 571 service connections.

What type of violations does Williamsburg Water Dept have? ▼

Williamsburg Water Dept has 97 total violations: 15 health-based violations (MCL exceedances or treatment failures), 51 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Williamsburg Water Dept water? ▼

No PFAS testing data is available for Williamsburg Water Dept under the EPA's UCMR5 monitoring program.

What water source does Williamsburg Water Dept use? ▼

Williamsburg Water Dept 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.