Community Water System · PWS MA4285000
Stoughton Water Department
Operator location Stoughton, Massachusetts - UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 45 violations and 29,281 people served.
- 29,281
- People served (this PWS)
- 45
- EPA violations (this PWS)
- 8
- Health-based (this PWS)
- 5 PFAS
- UCMR5 (this PWS)
Stoughton Water Department standing, mid SDWIS violation third
UCMR5 detected 5 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 18% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #1,916 of 29,740 among systems serving 500+.
The verdict
Stoughton Water Department lands in the middle third by violation volume (45), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (29,281; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 18% (middle-third health share (≤ 23%)). UCMR5 detected 5 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #1,916 of 29,740
- Population · /systems
- #80 of 418
- Population · MA
- 45
- Total EPA violations on record
- 18%
- 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
- 8,656
- County
- Norfolk
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 7
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 5 | 2015 |
| Nitrate | MR | 3 | 2025 |
| E. COLI | MR | 2 | 2015 |
| Lead and Copper Rule | TT | 2 | 1996 |
| Consumer Confidence Rule | Other | 2 | 2018 |
| Coliform (TCR) | MR | 2 | 2015 |
| Nitrate | MCL | 1 | 2005 |
Violation Count vs. the National Corpus
Stoughton Water Department has 45 recorded EPA violations, 54% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 46% carry more. 18% of this system's own violations are health-based (8 of 45), and it ranks #1,916 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)
45 Around the middle fewer violations than 46% 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. 13 of 149 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| 4:2 FTS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/4/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTA | 9/4/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/4/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/4/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NFDHA | 9/4/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFBS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/4/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 8:2 FTS | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/4/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTA | 9/4/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 9/4/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 9/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 9/4/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFBS | 9/4/2025 | 3.10 ppt | 3.00 ppt | Detected |
| PFHxS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 9/4/2025 | 4.80 ppt | 4.00 ppt | Detected |
| PFOA | 9/4/2025 | 7.30 ppt | 4.00 ppt | Detected |
| PFDA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxA | 9/4/2025 | 4.30 ppt | 3.00 ppt | Detected |
| 4:2 FTS | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 9/4/2025 | 3.40 ppt | 3.00 ppt | Detected |
| PFMPA | 9/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 9/4/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
UCMR5 PFAS record for Stoughton Water Department
Open EPA SDWIS federal reports for PWS MA4285000 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS · MassDEP, Drinking Water Program
Nationwide peers
45 violations · 29,281 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 Stoughton Water Department
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.