Transient Non-Community Water System · PWS NH0379020
Canterbury Rest Area
Operator location Concord, New Hampshire - 100% of 12 violations are health-based (upper-third health share (> 23%)); groundwater source; 1,505 served per SDWIS.
- 1,505
- People served (this PWS)
- 12
- EPA violations (this PWS)
- 12
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Canterbury Rest Area standing, low SDWIS violation third
100% of 12 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 100% is upper-third health share (> 23%). Population rank #15,832 of 29,740 among systems serving 500+.
The verdict
Canterbury Rest Area is in the lower third by violation count (12; lower-third violation load (≤ 21 violations)). A low count does not mean the system is unmonitored - monitoring and reporting violations still appear in SDWIS. Population served is mid-pack at 1,505 (mid served population (≤ 3,309)). Health-based share is 100% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #15,832 of 29,740
- Population · /systems
- #82 of 284
- Population · NH
- 12
- Total EPA violations on record
- 100%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Transient Non-Community
- Owner Type
- State
- Connections
- 1
- County
- Merrimack
- School/Daycare
- No
- MCL Violations
- 12
- Monitoring Violations
- 0
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 12 | 2012 |
Violation Count vs. the National Corpus
Canterbury Rest Area has 12 recorded EPA violations, 21% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 78% carry more. 100% of this system's own violations are health-based (12 of 12), and it ranks #15,832 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
12 Among the lowest violation counts fewer violations than 78% 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 Canterbury Rest Area
12 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH0379020.
Sources: EPA SDWIS
Nationwide peers
12 violations · 1,505 served: nearest cross-state SDWIS matches.
Cross-state systems with similarly light violation ledgers
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Canterbury Rest Area
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.