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Non-Transient Non-Community Water System · PWS MA1341010

Mt Greylock Regional School

Williamstown, Massachusetts 01267 - drinking water served from groundwater sources to 930 people, tracked in EPA SDWIS and UCMR5.

930
People served
88
EPA violations
0
Health-based
No PFAS
UCMR5 result

The verdict

EPA records 88 drinking-water violations at Mt Greylock Regional School - above the Massachusetts per-system average.

88
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
930
People served by this system
0
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Mt Greylock Regional School

Mt Greylock Regional School is a local-owned non-transient non-community water system that delivers drinking water to 930 residents in Williamstown, Massachusetts (Berkshire County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 88 total violations for this system , of which 0 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 79 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 Lead and Copper Rule, recorded in 4 violations (MR). This system was sampled under EPA's UCMR5 PFAS monitoring program and no PFAS compounds were detected above the minimum reporting level.

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%).

Mt Greylock Regional School's 88 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
930
Total Violations
88
Health-Based Violations
0
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
1
County
Berkshire
School/Daycare
Yes
MCL Violations
0
Monitoring Violations
79
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Lead and Copper Rule MR 4 2011
Heptachlor epoxide MR 2 2009
Pentachlorophenol MR 2 2009
Toxaphene MR 2 2009
2,4,5-TP MR 2 2009
BHC-GAMMA MR 2 2009
Benzo(a)pyrene MR 2 2009
Di(2-ethylhexyl) adipate MR 2 2009
Di(2-ethylhexyl) phthalate MR 2 2009
Dinoseb MR 2 2009
Glyphosate MR 2 2009
OXAMYL MR 2 2009
LASSO MR 2 2009
2,3,7,8-TCDD MR 2 2009
2,4-D MR 2 2009
ETHYLENE DIBROMIDE MR 2 2009
Endothall MR 2 2009
Revised Total Coliform Rule MON 2 2018
Hexachlorocyclopentadiene MR 2 2009
Simazine MR 2 2009
Diquat MR 2 2009
Atrazine MR 2 2009
Carbofuran MR 2 2009
Total Polychlorinated Biphenyls (PCB) MR 2 2009
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2009
Endrin MR 2 2009
Dalapon MR 2 2009
Heptachlor MR 2 2009
Chlordane MR 2 2009
Methoxychlor MR 2 2009

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 58 samples detected PFAS.

Contaminant Date Result MRL Status
PFTA 7/5/2023 <8.00 ppt 8.00 ppt Not Detected
NEtFOSAA 7/5/2023 <5.00 ppt 5.00 ppt Not Detected
PFTrDA 7/5/2023 <7.00 ppt 7.00 ppt Not Detected
NMeFOSAA 7/5/2023 <6.00 ppt 6.00 ppt Not Detected
PFPeS 4/4/2023 <4.00 ppt 4.00 ppt Not Detected
ADONA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFBS 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxS 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFNA 4/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 4/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFOA 4/4/2023 <4.00 ppt 4.00 ppt Not Detected
PFDA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHxA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 4/4/2023 <2.00 ppt 2.00 ppt Not Detected
9Cl-PF3ONS 4/4/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
NFDHA 4/4/2023 <20.00 ppt 20.00 ppt Not Detected
11Cl-PF3OUdS 4/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFMBA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 4/4/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 4/4/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 4/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 4/4/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 4/4/2023 <5.00 ppt 5.00 ppt Not Detected
PFEESA 4/4/2023 <3.00 ppt 3.00 ppt Not Detected
PFUnA 10/3/2023 <2.00 ppt 2.00 ppt Not Detected
PFPeS 10/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFEESA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFTrDA 10/3/2023 <7.00 ppt 7.00 ppt Not Detected
PFPeA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFMPA 10/3/2023 <4.00 ppt 4.00 ppt Not Detected
8:2 FTS 10/3/2023 <5.00 ppt 5.00 ppt Not Detected
4:2 FTS 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
6:2 FTS 10/3/2023 <5.00 ppt 5.00 ppt Not Detected
PFBA 10/3/2023 <5.00 ppt 5.00 ppt Not Detected
HFPO-DA 10/3/2023 <5.00 ppt 5.00 ppt Not Detected
ADONA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFHpS 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
11Cl-PF3OUdS 10/3/2023 <5.00 ppt 5.00 ppt Not Detected
NFDHA 10/3/2023 <20.00 ppt 20.00 ppt Not Detected
PFHxA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDoA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFDA 10/3/2023 <3.00 ppt 3.00 ppt Not Detected
PFOA 10/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFOS 10/3/2023 <4.00 ppt 4.00 ppt Not Detected
PFNA 10/3/2023 <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 Mt Greylock Regional School.

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 MA1341010 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 Mt Greylock Regional School 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 Radium-226 MR 1 SDWIS / MA1341010 / 4020
2018 Revised Total Coliform Rule MON 2 SDWIS / MA1341010 / 8000
2011 Lead and Copper Rule MR 4 SDWIS / MA1341010 / 5000
2009 Heptachlor epoxide MR 2 SDWIS / MA1341010 / 2067
2009 Pentachlorophenol MR 2 SDWIS / MA1341010 / 2326
2009 Toxaphene MR 2 SDWIS / MA1341010 / 2020
2009 2,4,5-TP MR 2 SDWIS / MA1341010 / 2110
2009 BHC-GAMMA MR 2 SDWIS / MA1341010 / 2010
2009 Benzo(a)pyrene MR 2 SDWIS / MA1341010 / 2306
2009 Di(2-ethylhexyl) adipate MR 2 SDWIS / MA1341010 / 2035
2009 Di(2-ethylhexyl) phthalate MR 2 SDWIS / MA1341010 / 2039
2009 Dinoseb MR 2 SDWIS / MA1341010 / 2041
2009 Glyphosate MR 2 SDWIS / MA1341010 / 2034
2009 OXAMYL MR 2 SDWIS / MA1341010 / 2036
2009 LASSO MR 2 SDWIS / MA1341010 / 2051

How Mt Greylock Regional School Compares

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

Metric Mt Greylock Regional School Massachusetts avg Federal benchmark
Total violations 88 46.2 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 0 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 930 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 Mt Greylock Regional School water safe to drink? ▼
Mt Greylock Regional School (PWS ID: MA1341010) has 88 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 930 people using Groundwater sources.
How many people does Mt Greylock Regional School serve? ▼
Mt Greylock Regional School serves 930 people in Williamstown, Massachusetts. It is a Local-owned system using Groundwater water sources with 1 service connections.
What type of violations does Mt Greylock Regional School have? ▼
Mt Greylock Regional School has 88 total violations: 0 health-based violations (MCL exceedances or treatment failures), 79 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Mt Greylock Regional School water? ▼
No. Mt Greylock Regional School was tested for PFAS under the EPA's UCMR5 monitoring program and no PFAS contamination was detected.
What water source does Mt Greylock Regional School use? ▼
Mt Greylock Regional School uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
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.