PlainWater
States → New Hampshire

Non-Transient Non-Community Water System · PWS NH2305050

Monadnock Regional High Sch

Swanzey, New Hampshire 03446 - drinking water served from groundwater sources to 1,202 people, tracked in EPA SDWIS and UCMR5.

1,202
People served
117
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 117 drinking-water violations at Monadnock Regional High Sch, 3% of them health-based - above the New Hampshire per-system average.

117
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
1,202
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Monadnock Regional High Sch

Monadnock Regional High Sch is a local-owned non-transient non-community water system that delivers drinking water to 1,202 residents in Swanzey, New Hampshire (Cheshire County) through 3 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 117 total violations for this system , of which 4 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 92 monitoring and reporting violations are on file. The most recent violation on record dates to 2008.

The most frequently cited contaminant at this system is Public Notice, recorded in 21 violations (Other). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across New Hampshire, EPA tracks 2,453 public water systems serving 1,242,123 people, with 155,970 cumulative violations and 29,649 health-based violations on record. About 90% of systems in the state carry at least one violation, and state-wide the average per system is 63.6 violations. Statewide, 23 of 51 UCMR5-tested systems have reported PFAS detections (45.1%).

Monadnock Regional High Sch's 117 violations sit above the New Hampshire 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
1,202
Total Violations
117
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
3
County
Cheshire
School/Daycare
Yes
MCL Violations
4
Monitoring Violations
92
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Public Notice Other 21 2006
1,2,4-Trichlorobenzene MR 4 2005
cis-1,2-Dichloroethylene MR 4 2005
Xylenes, Total MR 4 2005
o-Dichlorobenzene MR 4 2005
p-Dichlorobenzene MR 4 2005
trans-1,2-Dichloroethylene MR 4 2005
1,2-Dichloroethane MR 4 2005
1,2-Dichloropropane MR 4 2005
Trichloroethylene MR 4 2005
Tetrachloroethylene MR 4 2005
Benzene MR 4 2005
Ethylbenzene MR 4 2005
DICHLOROMETHANE MR 4 2005
Nitrate MR 4 2004
Toluene MR 4 2005
Carbon tetrachloride MR 4 2005
Vinyl chloride MR 4 2005
Coliform (TCR) MR 4 2003
1,1,1-Trichloroethane MR 4 2005
1,1-Dichloroethylene MR 4 2005
1,1,2-Trichloroethane MR 4 2005
CHLOROBENZENE MR 4 2005
Styrene MR 4 2005
Coliform (TCR) MCL 4 2008

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 Monadnock Regional High Sch.

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 NH2305050 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New Hampshire Drinking Water Authority

New Hampshire's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NH regulator via EPA SDWIS

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
2008 Coliform (TCR) MCL 4 SDWIS / NH2305050 / 3100
2006 Public Notice Other 21 SDWIS / NH2305050 / 7500
2005 1,2,4-Trichlorobenzene MR 4 SDWIS / NH2305050 / 2378
2005 cis-1,2-Dichloroethylene MR 4 SDWIS / NH2305050 / 2380
2005 Xylenes, Total MR 4 SDWIS / NH2305050 / 2955
2005 o-Dichlorobenzene MR 4 SDWIS / NH2305050 / 2968
2005 p-Dichlorobenzene MR 4 SDWIS / NH2305050 / 2969
2005 trans-1,2-Dichloroethylene MR 4 SDWIS / NH2305050 / 2979
2005 1,2-Dichloroethane MR 4 SDWIS / NH2305050 / 2980
2005 1,2-Dichloropropane MR 4 SDWIS / NH2305050 / 2983
2005 Trichloroethylene MR 4 SDWIS / NH2305050 / 2984
2005 Tetrachloroethylene MR 4 SDWIS / NH2305050 / 2987
2005 Benzene MR 4 SDWIS / NH2305050 / 2990
2005 Ethylbenzene MR 4 SDWIS / NH2305050 / 2992
2005 DICHLOROMETHANE MR 4 SDWIS / NH2305050 / 2964

How Monadnock Regional High Sch Compares

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

Metric Monadnock Regional High Sch New Hampshire avg Federal benchmark
Total violations 117 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 12.1 Indicates a contaminant exceeded a federal MCL
PFAS detection None 45.1% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,202 506 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 2,453 regulated public water systems in New Hampshire.

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 Monadnock Regional High Sch water safe to drink? ▼
Monadnock Regional High Sch (PWS ID: NH2305050) has 117 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,202 people using Groundwater sources.
How many people does Monadnock Regional High Sch serve? ▼
Monadnock Regional High Sch serves 1,202 people in Swanzey, New Hampshire. It is a Local-owned system using Groundwater water sources with 3 service connections.
What type of violations does Monadnock Regional High Sch have? ▼
Monadnock Regional High Sch has 117 total violations: 4 health-based violations (MCL exceedances or treatment failures), 92 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Monadnock Regional High Sch water? ▼
No PFAS testing data is available for Monadnock Regional High Sch under the EPA's UCMR5 monitoring program.
What water source does Monadnock Regional High Sch use? ▼
Monadnock Regional High Sch 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.