Community Water System · PWS MA4122000
Hanover Water Dept
Operator location Hanover, Massachusetts - 29% of 51 violations are health-based (upper-third health share (> 23%)); surface water source; 14,984 served per SDWIS.
- 14,984
- People served (this PWS)
- 51
- EPA violations (this PWS)
- 15
- Health-based (this PWS)
- 7 PFAS
- UCMR5 (this PWS)
Hanover Water Dept standing, mid SDWIS violation third
29% of 51 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 29% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #3,474 of 29,740 among systems serving 500+.
The verdict
Hanover Water Dept lands in the middle third by violation volume (51), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (14,984; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 29% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 7 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #3,474 of 29,740
- Population · /systems
- #144 of 418
- Population · MA
- 51
- Total EPA violations on record
- 29%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 5,165
- County
- Plymouth
- School/Daycare
- No
- MCL Violations
- 15
- Monitoring Violations
- 30
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| TTHM | MCL | 9 | 2020 |
| Coliform (TCR) | MCL | 6 | 2011 |
| Fluoride | MR | 2 | 2025 |
| Mercury | MR | 2 | 2025 |
| Selenium | MR | 2 | 2025 |
| Barium | MR | 2 | 2025 |
| Chromium | MR | 2 | 2025 |
| Beryllium, Total | MR | 2 | 2025 |
| Nickel | MR | 2 | 2025 |
| Thallium, Total | MR | 2 | 2025 |
| CYANIDE | MR | 2 | 2025 |
| Tetrachloroethylene | MR | 2 | 2024 |
| Arsenic | MR | 2 | 2025 |
| Cadmium | MR | 2 | 2025 |
| Consumer Confidence Rule | Other | 2 | 2010 |
| Antimony, Total | MR | 2 | 2025 |
| Coliform (TCR) | MR | 2 | 2015 |
| Lead and Copper Rule | MR | 2 | 2000 |
Violation Count vs. the National Corpus
Hanover Water Dept has 51 recorded EPA violations, 57% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 43% carry more. 29% of this system's own violations are health-based (15 of 51), and it ranks #3,474 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)
51 Around the middle fewer violations than 43% 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. 19 of 174 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFPeS | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/22/2023 | 6.60 ppt | 3.00 ppt | Detected |
| PFHpA | 8/22/2023 | 3.50 ppt | 3.00 ppt | Detected |
| PFHxS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/22/2023 | 11.40 ppt | 4.00 ppt | Detected |
| PFOA | 8/22/2023 | 8.90 ppt | 4.00 ppt | Detected |
| PFDoA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/22/2023 | 8.60 ppt | 3.00 ppt | Detected |
| PFUnA | 8/22/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/22/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| ADONA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/22/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/22/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 8/22/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/22/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHpS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/22/2023 | 8.00 ppt | 5.00 ppt | Detected |
| PFEESA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/22/2023 | 11.60 ppt | 3.00 ppt | Detected |
| 4:2 FTS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/22/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| HFPO-DA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/22/2023 | 4.30 ppt | 3.00 ppt | Detected |
| PFUnA | 8/22/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHpS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 8/22/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBA | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/22/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/22/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/22/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
Health-based violations on Hanover Water Dept
15 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MA4122000.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
51 violations · 14,984 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
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 Hanover Water Dept
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Massachusetts compares on the same EPA violation measures. Massachusetts 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.