Community Water System · PWS NH0354010
Cardigan Mountain Sch
Operator location Canaan, New Hampshire - 27% of 41 violations are health-based (upper-third health share (> 23%)); groundwater source; 300 served per SDWIS.
- 300
- People served (this PWS)
- 41
- EPA violations (this PWS)
- 11
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Cardigan Mountain Sch standing, mid SDWIS violation third
27% of 41 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 27% is upper-third health share (> 23%).
The verdict
Cardigan Mountain Sch lands in the middle third by violation volume (41), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (300; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 27% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 41
- Total EPA violations on record
- 27%
- Health-based (MCL / treatment failure)
- 300
- 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
- 23
- County
- Grafton
- School/Daycare
- No
- MCL Violations
- 11
- Monitoring Violations
- 24
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 14 | 2019 |
| Coliform (TCR) | MCL | 11 | 1991 |
| Consumer Confidence Rule | Other | 6 | 2017 |
| Nitrate | MR | 4 | 1995 |
| Lead and Copper Rule | MR | 2 | 2024 |
| TTHM | MR | 2 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 2 | 2025 |
Violation Count vs. the National Corpus
Cardigan Mountain Sch has 41 recorded EPA violations, 51% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 48% carry more. 27% of this system's own violations are health-based (11 of 41), 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)
41 Around the middle fewer violations than 48% 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 Cardigan Mountain Sch
11 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH0354010.
Sources: EPA SDWIS
Nationwide peers
41 violations · 300 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Cardigan Mountain Sch
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.