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Community Water System · PWS NH0603010

Contoocook River Cooperative

Operator location Deering, New Hampshire - 42% of 143 violations are health-based (upper-third health share (> 23%)); groundwater source; 245 served per SDWIS.

245
People served (this PWS)
143
EPA violations (this PWS)
60
Health-based (this PWS)
Untested
UCMR5 (this PWS)
Follow published updates (RSS)

Contoocook River Cooperative standing, high SDWIS violation third

42% of 143 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 42% is upper-third health share (> 23%).

The verdict

Contoocook River Cooperative sits in the upper third of the sitemap cohort by violation count (143), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (245; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 42% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.

143
Total EPA violations on record
42%
Health-based (MCL / treatment failure)
245
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.

System Details

System Type
Community
Owner Type
Private
Connections
89
County
Hillsborough
School/Daycare
No
MCL Violations
60
Monitoring Violations
74
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Coliform (TCR) MCL 60 2013
E. COLI MR 16 2013
Public Notice Other 8 2013
Coliform (TCR) MR 4 2009
Nitrate MR 4 1995
Methoxychlor MR 2 2006
Toxaphene MR 2 2006
Glyphosate MR 2 2006
OXAMYL MR 2 2006
Simazine MR 2 2006
Carbofuran MR 2 2006
Atrazine MR 2 2006
LASSO MR 2 2006
Heptachlor MR 2 2006
2,4-D MR 2 2006
HEXACHLOROBENZENE MR 2 2006
Di(2-ethylhexyl) phthalate MR 2 2006
Endrin MR 2 2006
BHC-GAMMA MR 2 2006
Hexachlorocyclopentadiene MR 2 2006
Pentachlorophenol MR 2 2006
2,4,5-TP MR 2 2006
Dinoseb MR 2 2006
Chlordane MR 2 2006
Heptachlor epoxide MR 2 2006
Benzo(a)pyrene MR 2 2006
Di(2-ethylhexyl) adipate MR 2 2006
1,2-DIBROMO-3-CHLOROPROPANE MR 2 2006
Picloram MR 2 2006
ETHYLENE DIBROMIDE MR 2 2006

Violation Count vs. the National Corpus

Contoocook River Cooperative has 143 recorded EPA violations, 80% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 20% carry more. 42% of this system's own violations are health-based (60 of 143), 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)

143 Higher than most more violations than 80% 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

Health-based violations on Contoocook River Cooperative

60 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH0603010.

Sources: EPA SDWIS

Nationwide peers

143 violations · 245 served: nearest cross-state SDWIS matches.

What to do with Contoocook River Cooperative

Use this system's EPA-reported record as a starting filter, not a final verdict.

EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater