Community Water System · PWS NH1031010
Hampstead Area Water
Operator location Atkinson, New Hampshire - 24% of 174 violations are health-based (upper-third health share (> 23%)); surface water source; 6,953 served per SDWIS.
- 6,953
- People served (this PWS)
- 174
- EPA violations (this PWS)
- 42
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Hampstead Area Water standing, high SDWIS violation third
24% of 174 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 24% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #6,171 of 29,740 among systems serving 500+.
The verdict
Hampstead Area Water sits in the upper third of the sitemap cohort by violation count (174), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (6,953; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 24% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #6,171 of 29,740
- Population · /systems
- #26 of 284
- Population · NH
- 174
- Total EPA violations on record
- 24%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
5 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 2,824
- County
- Rockingham
- School/Daycare
- No
- MCL Violations
- 36
- Monitoring Violations
- 128
- Treatment Tech Violations
- 6
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 20 | 1998 |
| Combined Radium (-226 and -228) | MCL | 12 | 2020 |
| TTHM | MR | 12 | 2020 |
| Total Haloacetic Acids (HAA5) | MR | 12 | 2020 |
| Arsenic | MR | 8 | 2023 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2002 |
| cis-1,2-Dichloroethylene | MR | 4 | 2002 |
| Vinyl chloride | MR | 4 | 2002 |
| 1,1,1-Trichloroethane | MR | 4 | 2002 |
| 1,2-Dichloropropane | MR | 4 | 2002 |
| Trichloroethylene | MR | 4 | 2002 |
| 1,1,2-Trichloroethane | MR | 4 | 2002 |
| Tetrachloroethylene | MR | 4 | 2002 |
| CHLOROBENZENE | MR | 4 | 2002 |
| Benzene | MR | 4 | 2002 |
| Ethylbenzene | MR | 4 | 2002 |
| Styrene | MR | 4 | 2002 |
| Nitrate | MR | 4 | 2006 |
| Arsenic | MCL | 4 | 2018 |
| Revised Total Coliform Rule | TT | 4 | 2020 |
| Revised Total Coliform Rule | RPT | 4 | 2020 |
| 1,2-Dichloroethane | MR | 4 | 2002 |
| p-Dichlorobenzene | MR | 4 | 2002 |
| Carbon tetrachloride | MR | 4 | 2002 |
| 1,2,4-Trichlorobenzene | MR | 4 | 2002 |
| trans-1,2-Dichloroethylene | MR | 4 | 2002 |
| Xylenes, Total | MR | 4 | 2002 |
| Toluene | MR | 4 | 2002 |
| Combined Radium (-226 and -228) | MR | 4 | 2002 |
| o-Dichlorobenzene | MR | 4 | 2002 |
Violation Count vs. the National Corpus
Hampstead Area Water has 174 recorded EPA violations, 83% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 17% carry more. 24% of this system's own violations are health-based (42 of 174), and it ranks #6,171 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)
174 Higher than most more violations than 83% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 33 of 696 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFMPA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/14/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFHpS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/14/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/14/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFUnA | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| NMeFOSAA | 8/14/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/14/2024 | 5.90 ppt | 4.00 ppt | Detected |
| PFDA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/14/2024 | 3.20 ppt | 3.00 ppt | Detected |
| NEtFOSAA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/14/2024 | 7.20 ppt | 3.00 ppt | Detected |
| PFHpA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/14/2024 | 7.50 ppt | 4.00 ppt | Detected |
| PFPeS | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/14/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/14/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/14/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/14/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Hampstead Area Water
42 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NH1031010.
Sources: EPA SDWIS
Nationwide peers
174 violations · 6,953 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Hampstead Area Water
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.