Community Water System · PWS NH1661010
New Castle Water Works
Operator location Portsmouth, New Hampshire - 72% of 115 violations are health-based (upper-third health share (> 23%)); surface water source; 910 served per SDWIS.
- 910
- People served (this PWS)
- 115
- EPA violations (this PWS)
- 83
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
New Castle Water Works standing, high SDWIS violation third
72% of 115 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 72% is upper-third health share (> 23%). Population rank #20,843 of 29,740 among systems serving 500+.
The verdict
New Castle Water Works sits in the upper third of the sitemap cohort by violation count (115), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (910; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 72% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #20,843 of 29,740
- Population · /systems
- #139 of 284
- Population · NH
- 115
- Total EPA violations on record
- 72%
- 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
- 365
- County
- Rockingham
- School/Daycare
- No
- MCL Violations
- 81
- Monitoring Violations
- 30
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 66 | 2018 |
| Coliform (TCR) | MCL | 15 | 1995 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2010 |
| TTHM | MR | 8 | 2010 |
| Chlorine | MR | 8 | 2016 |
| Lead and Copper Rule | MR | 6 | 2023 |
| Consumer Confidence Rule | Other | 2 | 2008 |
| Lead and Copper Rule | TT | 2 | 1994 |
Violation Count vs. the National Corpus
New Castle Water Works has 115 recorded EPA violations, 76% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 24% carry more. 72% of this system's own violations are health-based (83 of 115), and it ranks #20,843 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)
115 Higher than most more 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 New Castle Water Works
83 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH1661010.
Sources: EPA SDWIS
Nationwide peers
115 violations · 910 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with New Castle Water Works
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.