Non-Transient Non-Community Water System · PWS MA2286007

Stow Center School

Bolton, Massachusetts 01740 - drinking water served from groundwater sources to 644 people, tracked in EPA SDWIS and UCMR5.

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

644
People served: 177
EPA violations: 2
Health-based: Untested
UCMR5 result

The verdict

EPA records 177 drinking-water violations at Stow Center School, 1% of them health-based - above the Massachusetts per-system average.

177
Total EPA violations on record: 1%
Health-based (MCL / treatment failure): 644
People served by this system: N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Stow Center School

Stow Center School is a local-owned non-transient non-community water system that delivers drinking water to 644 residents in Bolton, Massachusetts (Middlesex County) through 1 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 177 total violations for this system , of which 2 (1%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 171 monitoring and reporting violations are on file. The most recent violation on record dates to 2024.

The most frequently cited contaminant at this system is Nitrate, recorded in 10 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, 148 of 263 UCMR5-tested systems have reported PFAS detections (56.3%).

Stow Center School's 177 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

644

Total Violations

177

Health-Based Violations

Water Source

Groundwater

System Details

System Type: Non-Transient Non-Community
Owner Type: Local
Connections: 1
County: Middlesex
School/Daycare: Yes
MCL Violations: 2
Monitoring Violations: 171
Treatment Tech Violations: 0

Violation History

Contaminant violations recorded by EPA.

Contaminant	Category	Count	Latest
Nitrate	MR	10	2001
Lead and Copper Rule	MR	10	2024
Benzene	MR	4	2011
trans-1,2-Dichloroethylene	MR	4	2011
cis-1,2-Dichloroethylene	MR	4	2011
1,2-Dichloropropane	MR	4	2011
Ethylbenzene	MR	4	2011
Toluene	MR	4	2011
DICHLOROMETHANE	MR	4	2011
Carbon tetrachloride	MR	4	2011
1,2,4-Trichlorobenzene	MR	4	2011
1,1-Dichloroethylene	MR	4	2011
1,2-Dichloroethane	MR	4	2011
Trichloroethylene	MR	4	2011
o-Dichlorobenzene	MR	4	2011
p-Dichlorobenzene	MR	4	2011
1,1,1-Trichloroethane	MR	4	2011
Tetrachloroethylene	MR	4	2011
CHLOROBENZENE	MR	4	2011
Styrene	MR	4	2011
1,1,2-Trichloroethane	MR	4	2011
Vinyl chloride	MR	4	2011
Xylenes, Total	MR	4	2011
Coliform (TCR)	MCL	2	2014
Endrin	MR	2	1997
Methoxychlor	MR	2	1997
Glyphosate	MR	2	1997
Simazine	MR	2	1997
Di(2-ethylhexyl) phthalate	MR	2	1997
Dinoseb	MR	2	1997

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 Stow Center 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 MA2286007 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 Stow Center 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
2024	Lead and Copper Rule	MR	10	SDWIS / MA2286007 / 5000
2014	Coliform (TCR)	MCL	2	SDWIS / MA2286007 / 3100
2011	Benzene	MR	4	SDWIS / MA2286007 / 2990
2011	trans-1,2-Dichloroethylene	MR	4	SDWIS / MA2286007 / 2979
2011	cis-1,2-Dichloroethylene	MR	4	SDWIS / MA2286007 / 2380
2011	1,2-Dichloropropane	MR	4	SDWIS / MA2286007 / 2983
2011	Ethylbenzene	MR	4	SDWIS / MA2286007 / 2992
2011	Toluene	MR	4	SDWIS / MA2286007 / 2991
2011	DICHLOROMETHANE	MR	4	SDWIS / MA2286007 / 2964
2011	Carbon tetrachloride	MR	4	SDWIS / MA2286007 / 2982
2011	1,2,4-Trichlorobenzene	MR	4	SDWIS / MA2286007 / 2378
2011	1,1-Dichloroethylene	MR	4	SDWIS / MA2286007 / 2977
2011	1,2-Dichloroethane	MR	4	SDWIS / MA2286007 / 2980
2011	Trichloroethylene	MR	4	SDWIS / MA2286007 / 2984
2011	o-Dichlorobenzene	MR	4	SDWIS / MA2286007 / 2968

How Stow Center School Compares

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

Metric	Stow Center School	Massachusetts avg	Federal benchmark
Total violations	177	46.2	SDWA compliance, any non-zero count is a recorded breach
Health-based violations	2	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	644	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 Stow Center School water safe to drink? ▼

Stow Center School (PWS ID: MA2286007) has 177 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 644 people using Groundwater sources.

How many people does Stow Center School serve? ▼

Stow Center School serves 644 people in Bolton, Massachusetts. It is a Local-owned system using Groundwater water sources with 1 service connections.

What type of violations does Stow Center School have? ▼

Stow Center School has 177 total violations: 2 health-based violations (MCL exceedances or treatment failures), 171 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.

Has PFAS been detected in Stow Center School water? ▼

No PFAS testing data is available for Stow Center School under the EPA's UCMR5 monitoring program.

What water source does Stow Center School use? ▼

Stow Center 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. 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.