Community Water System · PWS NH0583050
Rock Rimmon Cooperative
Operator location East Hampstead, New Hampshire - 52% of 178 violations are health-based (upper-third health share (> 23%)); groundwater source; 200 served per SDWIS.
- 200
- People served (this PWS) Smaller third of systems
- 178
- EPA violations (this PWS) Upper third of systems
- 92
- Health-based (this PWS) Upper third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Rock Rimmon Cooperative standing, high SDWIS violation third
52% of 178 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 52% is upper-third health share (> 23%).
The verdict
Rock Rimmon Cooperative sits in the upper third of the sitemap cohort by violation count (178), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (200; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 52% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 178
- Total EPA violations on record
- 52%
- Health-based (MCL / treatment failure)
- 200
- People served by this PWS (SDWIS)
- N/A
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
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 |
Violation Count vs. the National Corpus
Rock Rimmon Cooperative has 178 recorded EPA violations, 84% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 16% carry more. 52% of this system's own violations are health-based (92 of 178), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
178 Higher than most more violations than 84% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
How many violations vs. how serious, among peer systems
Rock Rimmon Cooperative plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
Health-based violations on Rock Rimmon Cooperative
92 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH0583050.
Sources: EPA SDWIS
Nationwide peers
178 violations · 200 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Rock Rimmon Cooperative
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New Hampshire compares on the same EPA violation measures. New Hampshire systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.