Community Water System · PWS NH2531010
Winchester Water Dept
Operator location Winchester, New Hampshire - 69% of 13 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,800 served per SDWIS.
- 2,800
- People served (this PWS)
- 13
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Winchester Water Dept standing, low SDWIS violation third
69% of 13 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 69% is upper-third health share (> 23%). Population rank #11,128 of 29,740 among systems serving 500+.
The verdict
Winchester Water Dept is in the lower third by violation count (13; 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 2,800 (mid served population (≤ 3,309)). Health-based share is 69% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #11,128 of 29,740
- Population · /systems
- #54 of 284
- Population · NH
- 13
- Total EPA violations on record
- 69%
- 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
- Community
- Owner Type
- Local
- Connections
- 1,128
- County
- Cheshire
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 4
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 7 | 1996 |
| Chlorine | MR | 4 | 2016 |
| Lead and Copper Rule | TT | 2 | 1994 |
Violation Count vs. the National Corpus
Winchester Water Dept has 13 recorded EPA violations, 22% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 76% carry more. 69% of this system's own violations are health-based (9 of 13), and it ranks #11,128 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)
13 Among the lowest violation counts fewer violations than 76% 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 Winchester Water Dept
9 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH2531010.
Sources: EPA SDWIS
Nationwide peers
13 violations · 2,800 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 Winchester Water Dept
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.