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Community Water System · PWS NH0583050

Rock Rimmon Cooperative

East Hampstead, New Hampshire 03826 - drinking water served from groundwater sources to 200 people, tracked in EPA SDWIS and UCMR5.

200
People served
178
EPA violations
92
Health-based
Untested
UCMR5 result

The verdict

EPA records 178 drinking-water violations at Rock Rimmon Cooperative, 52% of them health-based - above the New Hampshire per-system average.

178
Total EPA violations on record
52%
Health-based (MCL / treatment failure)
200
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Rock Rimmon Cooperative

Rock Rimmon Cooperative is a private-owned community water system that delivers drinking water to 200 residents in East Hampstead, New Hampshire (Rockingham County) through 121 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 178 total violations for this system , of which 92 (52%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 73 monitoring and reporting violations are on file. The most recent violation on record dates to 2021.

The most frequently cited contaminant at this system is Combined Radium (-226 and -228), recorded in 42 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 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%).

Rock Rimmon Cooperative's 178 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
200
Total Violations
178
Health-Based Violations
92
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Private
Connections
121
County
Rockingham
School/Daycare
No
MCL Violations
82
Monitoring Violations
73
Treatment Tech Violations
10

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Combined Radium (-226 and -228) MCL 42 2017
Arsenic MCL 32 2015
Coliform (TCR) MR 11 2010
Groundwater Rule TT 10 2021
Public Notice Other 6 2017
Gross Alpha, Excl. Radon and U MCL 4 2003
Coliform (TCR) MCL 4 2012
Revised Total Coliform Rule RPT 4 2016
Gross Alpha, Excl. Radon and U MR 4 2017
Combined Uranium MR 4 2017
Chlorine MR 4 2017
Arsenic MR 4 2010
Revised Total Coliform Rule MON 4 2016
Consumer Confidence Rule Other 3 2016
cis-1,2-Dichloroethylene MR 2 2017
DICHLOROMETHANE MR 2 2017
o-Dichlorobenzene MR 2 2017
Vinyl chloride MR 2 2017
trans-1,2-Dichloroethylene MR 2 2017
Carbon tetrachloride MR 2 2017
1,2-Dichloropropane MR 2 2017
Trichloroethylene MR 2 2017
CHLOROBENZENE MR 2 2017
Toluene MR 2 2017
Ethylbenzene MR 2 2017
Styrene MR 2 2017
1,1-Dichloroethylene MR 2 2017
1,1,1-Trichloroethane MR 2 2017
1,1,2-Trichloroethane MR 2 2017
p-Dichlorobenzene MR 2 2017

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 Rock Rimmon Cooperative.

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 NH0583050 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
2021 Groundwater Rule TT 10 SDWIS / NH0583050 / 0700
2017 Combined Radium (-226 and -228) MCL 42 SDWIS / NH0583050 / 4010
2017 Public Notice Other 6 SDWIS / NH0583050 / 7500
2017 Gross Alpha, Excl. Radon and U MR 4 SDWIS / NH0583050 / 4000
2017 Combined Uranium MR 4 SDWIS / NH0583050 / 4006
2017 Chlorine MR 4 SDWIS / NH0583050 / 0999
2017 cis-1,2-Dichloroethylene MR 2 SDWIS / NH0583050 / 2380
2017 DICHLOROMETHANE MR 2 SDWIS / NH0583050 / 2964
2017 o-Dichlorobenzene MR 2 SDWIS / NH0583050 / 2968
2017 Vinyl chloride MR 2 SDWIS / NH0583050 / 2976
2017 trans-1,2-Dichloroethylene MR 2 SDWIS / NH0583050 / 2979
2017 Carbon tetrachloride MR 2 SDWIS / NH0583050 / 2982
2017 1,2-Dichloropropane MR 2 SDWIS / NH0583050 / 2983
2017 Trichloroethylene MR 2 SDWIS / NH0583050 / 2984
2017 CHLOROBENZENE MR 2 SDWIS / NH0583050 / 2989

How Rock Rimmon Cooperative Compares

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

Metric Rock Rimmon Cooperative New Hampshire avg Federal benchmark
Total violations 178 63.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 92 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 200 506 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 Rock Rimmon Cooperative water safe to drink? ▼
Rock Rimmon Cooperative (PWS ID: NH0583050) has 178 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 200 people using Groundwater sources.
How many people does Rock Rimmon Cooperative serve? ▼
Rock Rimmon Cooperative serves 200 people in East Hampstead, New Hampshire. It is a Private-owned system using Groundwater water sources with 121 service connections.
What type of violations does Rock Rimmon Cooperative have? ▼
Rock Rimmon Cooperative has 178 total violations: 92 health-based violations (MCL exceedances or treatment failures), 73 monitoring/reporting violations, and 10 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Rock Rimmon Cooperative water? ▼
No PFAS testing data is available for Rock Rimmon Cooperative under the EPA's UCMR5 monitoring program.
What water source does Rock Rimmon Cooperative use? ▼
Rock Rimmon Cooperative 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.