Community Water System · PWS MA4182000
Middleborough Water Supply
Operator location Middleborough, Massachusetts - UCMR5 detected 8 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 32 violations and 15,350 people served.
- 15,350
- People served (this PWS)
- 32
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- 8 PFAS
- UCMR5 (this PWS)
Middleborough Water Supply standing, mid SDWIS violation third
UCMR5 detected 8 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 22% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #3,388 of 29,740 among systems serving 500+.
The verdict
Middleborough Water Supply lands in the middle third by violation volume (32), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (15,350; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 22% (middle-third health share (≤ 23%)). UCMR5 detected 8 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #3,388 of 29,740
- Population · /systems
- #142 of 418
- Population · MA
- 32
- Total EPA violations on record
- 22%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
8 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 6,281
- County
- Plymouth
- School/Daycare
- No
- MCL Violations
- 7
- Monitoring Violations
- 12
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 7 | 2005 |
| Consumer Confidence Rule | Other | 2 | 2012 |
| Lead and Copper Rule | MR | 2 | 2006 |
| Trichloroethylene | MR | 1 | 1993 |
| 1,1,1-Trichloroethane | MR | 1 | 1993 |
| 1,1-Dichloroethylene | MR | 1 | 1993 |
| Nitrite | MR | 1 | 1993 |
| Coliform (TCR) | MR | 1 | 1996 |
| 1,2-Dichloroethane | MR | 1 | 1993 |
| Benzene | MR | 1 | 1993 |
| Carbon tetrachloride | MR | 1 | 1993 |
| p-Dichlorobenzene | MR | 1 | 1993 |
| Vinyl chloride | MR | 1 | 1993 |
Violation Count vs. the National Corpus
Middleborough Water Supply has 32 recorded EPA violations, 44% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 55% carry more. 22% of this system's own violations are health-based (7 of 32), and it ranks #3,388 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)
32 Lower than most fewer violations than 55% 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. 36 of 580 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| NFDHA | 6/2/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFBS | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 6/2/2025 | 4.00 ppt | 3.00 ppt | Detected |
| PFHxS | 6/2/2025 | 3.00 ppt | 3.00 ppt | Detected |
| PFOS | 6/2/2025 | 4.00 ppt | 4.00 ppt | Detected |
| PFDoA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/2/2025 | 10.00 ppt | 3.00 ppt | Detected |
| PFUnA | 6/2/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/2/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 6/2/2025 | 13.00 ppt | 3.00 ppt | Detected |
| PFMPA | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeS | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 6/2/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| 8:2 FTS | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 6/2/2025 | 5.00 ppt | 5.00 ppt | Detected |
| PFDA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 6/2/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/2/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFMBA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 6/2/2025 | 11.00 ppt | 4.00 ppt | Detected |
| NEtFOSAA | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/2/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 6/2/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFBS | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NMeFOSAA | 6/2/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHpA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/2/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFTrDA | 6/2/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 6/2/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHxA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| ADONA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 6/2/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/2/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 6/2/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
UCMR5 PFAS record for Middleborough Water Supply
Open EPA SDWIS federal reports for PWS MA4182000 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
32 violations · 15,350 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 Middleborough Water Supply
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.