Transient Non-Community Water System · PWS NH1657010
Fells Mainhouse
Operator location Newbury, New Hampshire - 41% of 86 violations are health-based (upper-third health share (> 23%)); groundwater source; 50 served per SDWIS.
- 50
- People served (this PWS)
- 86
- EPA violations (this PWS)
- 35
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Fells Mainhouse standing, high SDWIS violation third
41% of 86 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 41% is upper-third health share (> 23%).
The verdict
Fells Mainhouse sits in the upper third of the sitemap cohort by violation count (86), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (50; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 41% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- 86
- Total EPA violations on record
- 41%
- Health-based (MCL / treatment failure)
- 50
- 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
- Transient Non-Community
- Owner Type
- State
- Connections
- 3
- County
- Merrimack
- School/Daycare
- No
- MCL Violations
- 31
- Monitoring Violations
- 33
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 27 | 2011 |
| Revised Total Coliform Rule | RPT | 12 | 2020 |
| Coliform (TCR) | MR | 9 | 2013 |
| Nitrate | MR | 8 | 2001 |
| E. COLI | MR | 8 | 2019 |
| Revised Total Coliform Rule | MON | 8 | 2020 |
| Public Notice | Other | 6 | 2012 |
| Revised Total Coliform Rule | TT | 4 | 2019 |
| Revised Total Coliform Rule | MCL | 4 | 2023 |
Violation Count vs. the National Corpus
Fells Mainhouse has 86 recorded EPA violations, 70% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 30% carry more. 41% of this system's own violations are health-based (35 of 86), 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)
86 Around the middle fewer violations than 30% 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 Fells Mainhouse
35 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH1657010.
Sources: EPA SDWIS
Nationwide peers
86 violations · 50 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.
What to do with Fells Mainhouse
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.