Community Water System · PWS MA4350000
Wrentham Water Division
Operator location Wrentham, Massachusetts - 39% of 125 violations are health-based (upper-third health share (> 23%)); groundwater source; 11,795 served per SDWIS.
- 11,795
- People served (this PWS)
- 125
- EPA violations (this PWS)
- 49
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Wrentham Water Division standing, high SDWIS violation third
39% of 125 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 39% is upper-third health share (> 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #4,166 of 29,740 among systems serving 500+.
The verdict
Wrentham Water Division sits in the upper third of the sitemap cohort by violation count (125), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (11,795; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 39% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #4,166 of 29,740
- Population · /systems
- #161 of 418
- Population · MA
- 125
- Total EPA violations on record
- 39%
- 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
- Local
- Connections
- 4,016
- County
- Norfolk
- School/Daycare
- No
- MCL Violations
- 49
- Monitoring Violations
- 68
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 49 | 2014 |
| Lead and Copper Rule | MR | 7 | 2015 |
| Coliform (TCR) | MR | 4 | 2012 |
| Consumer Confidence Rule | Other | 2 | 2015 |
| BHC-GAMMA | MR | 1 | 2005 |
| Total Polychlorinated Biphenyls (PCB) | MR | 1 | 2005 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 1 | 2005 |
| Dalapon | MR | 1 | 2005 |
| Atrazine | MR | 1 | 2005 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 2005 |
| Diquat | MR | 1 | 2005 |
| Glyphosate | MR | 1 | 2005 |
| Hexachlorocyclopentadiene | MR | 1 | 2005 |
| Picloram | MR | 1 | 2005 |
| Simazine | MR | 1 | 2005 |
| 2,3,7,8-TCDD | MR | 1 | 2005 |
| Carbon tetrachloride | MR | 1 | 2005 |
| 1,1-Dichloroethylene | MR | 1 | 2005 |
| Trichloroethylene | MR | 1 | 2005 |
| CHLOROBENZENE | MR | 1 | 2005 |
| o-Dichlorobenzene | MR | 1 | 2005 |
| trans-1,2-Dichloroethylene | MR | 1 | 2005 |
| cis-1,2-Dichloroethylene | MR | 1 | 2005 |
| 2,4-D | MR | 1 | 2005 |
| Ethylbenzene | MR | 1 | 2005 |
| Styrene | MR | 1 | 2005 |
| Toluene | MR | 1 | 2005 |
| p-Dichlorobenzene | MR | 1 | 2005 |
| Xylenes, Total | MR | 1 | 2005 |
| DICHLOROMETHANE | MR | 1 | 2005 |
Violation Count vs. the National Corpus
Wrentham Water Division has 125 recorded EPA violations, 78% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 22% carry more. 39% of this system's own violations are health-based (49 of 125), and it ranks #4,166 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)
125 Higher than most more violations than 78% 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. 8 of 174 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFPeA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| HFPO-DA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/17/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/17/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/17/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| NFDHA | 8/17/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFOA | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/17/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/17/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 8/17/2023 | 3.10 ppt | 3.00 ppt | Detected |
| HFPO-DA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMBA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/17/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/17/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 8/17/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFHxA | 8/17/2023 | 3.20 ppt | 3.00 ppt | Detected |
| NEtFOSAA | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/17/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTA | 8/17/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpA | 8/17/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/17/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/17/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
Health-based violations on Wrentham Water Division
49 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for MA4350000.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
125 violations · 11,795 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 Wrentham Water Division
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.