Public water system record
Rock Rimmon Cooperative
Serves an area of Rockingham County, NH · 200 people served
Federal records show 6 health-based violations and 27 monitoring/reporting issues for Rock Rimmon Cooperative in the last ten years. The most serious issue in this window was a resolved Groundwater Rule violation.
System profile
- Health-based violations, last 10 years
- 6
- Resolved
- 6
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 27
Key facts
- Rock Rimmon Cooperative draws water from 2 wells.
- Highest measured level in the last 10 years: Combined Radium (-226 and -228), 7.5 pCi/L, federal limit 5 pCi/L (1.5 times the limit), 2017.
- Most recent formal enforcement: signed compliance agreement by New Hampshire, March 2008.
- Record on file since 1993, with 16 health-based violations before October 19, 2016.
Check whether Rock Rimmon Cooperative serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Groundwater Rule
Treatment technique failure
|
140 | Nov 1, 2021 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Oct 1, 2019 | Resolved | No |
|
Groundwater Rule
Treatment technique failure
|
140 | Sep 1, 2018 | Resolved | No |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
340 | Oct 1, 2017 | Resolved | No |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
340 | Apr 1, 2017 | Resolved | No |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 7.5 pCi/L, federal limit 5 pCi/L (1.5 times the limit)
|
340 | Jan 1, 2017 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Groundwater Rule
Monitoring and reporting
|
Nov 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Groundwater Rule
Monitoring and reporting
|
Oct 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Chlorine
Monitoring and reporting
|
Oct 1, 2017 | Resolved |
|
Public Notice
OTHER
|
May 3, 2017 | Resolved |
|
Styrene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Toluene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Benzene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Vinyl chloride
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Combined Uranium
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
|
Gross Alpha, Excl. Radon and U
Monitoring and reporting
|
Apr 1, 2017 | Resolved |
Full record since 1993
EPA's records for Rock Rimmon Cooperative go back to 1993. Before October 19, 2016 they list 16 health-based violations (16 resolved) and 9 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 2 |
| 2000s | 4 | 1 |
| 2010 to October 18, 2016 | 12 | 6 |
| October 19, 2016 to 2019 | 5 | 25 |
| 2020s | 1 | 2 |
Most recent health-based violation before October 19, 2016: Arsenic, began October 2015, Resolved.
Show all 16 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 0.022 mg/L, federal limit 0.01 mg/L (2.2 times the limit)
|
Oct 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.03 mg/L, federal limit 0.01 mg/L (3 times the limit)
|
Jul 1, 2015 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Apr 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.024 mg/L, federal limit 0.01 mg/L (2.4 times the limit)
|
Apr 1, 2015 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Jan 1, 2015 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.025 mg/L, federal limit 0.01 mg/L (2.5 times the limit)
|
Jan 1, 2015 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Oct 1, 2014 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.032 mg/L, federal limit 0.01 mg/L (3.2 times the limit)
|
Oct 1, 2014 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Jul 1, 2014 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Jan 1, 2014 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 6 pCi/L, federal limit 5 pCi/L (1.2 times the limit)
|
Oct 1, 2013 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2012 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.011 mg/L, federal limit 0.01 mg/L (1.1 times the limit)
|
Oct 1, 2007 | Resolved |
|
Arsenic
Contaminant limit exceeded
Measured 0.012 mg/L, federal limit 0.01 mg/L (1.2 times the limit)
|
Jul 1, 2007 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2003 | Resolved |
Enforcement actions
New Hampshire regulators took 1 formal enforcement action against Rock Rimmon Cooperative in 2008. The most recent was a signed compliance agreement in March 2008.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 31, 2008 | New Hampshire | Signed compliance agreement | 2 violations (2 health-based): Arsenic |
What the violations mean
Groundwater Rule
3 incidentsThe system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).
The utility had to notify customers about each of these violations.
Combined Radium (-226 and -228)
3 incidentsTest results for Combined Radium (-226 and -228) were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Rock Rimmon Cooperative draws water from 2 wells.
Annual water quality report
Rock Rimmon Cooperative must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Rock Rimmon Cooperative for a copy.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by New Hampshire.
Certified drinking water labs by state EPA guidance for private wells