Community Water System · PWS MA3342000
Wilmington Water Dept
Operator location Wilmington, Massachusetts - UCMR5 detected 2 PFAS compounds (lower-third PFAS panel (≤ 2 compounds)) on this PWS; SDWIS lists 65 violations and 22,481 people served.
- 22,481
- People served (this PWS)
- 65
- EPA violations (this PWS)
- 7
- Health-based (this PWS)
- 2 PFAS
- UCMR5 (this PWS)
Wilmington Water Dept standing, mid SDWIS violation third
UCMR5 detected 2 PFAS compounds - lower-third PFAS panel (≤ 2 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 11% is middle-third health share (≤ 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #2,464 of 29,740 among systems serving 500+.
The verdict
Wilmington Water Dept lands in the middle third by violation volume (65), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is large (22,481; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 11% (middle-third health share (≤ 23%)). UCMR5 detected 2 PFAS compounds (lower-third PFAS panel (≤ 2 compounds)).
- #2,464 of 29,740
- Population · /systems
- #105 of 418
- Population · MA
- 65
- Total EPA violations on record
- 11%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
2 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 7,751
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 5
- Monitoring Violations
- 46
- Treatment Tech Violations
- 2
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Vinyl chloride | MR | 2 | 2010 |
| CHLOROBENZENE | MR | 2 | 2010 |
| o-Dichlorobenzene | MR | 2 | 2010 |
| trans-1,2-Dichloroethylene | MR | 2 | 2010 |
| cis-1,2-Dichloroethylene | MR | 2 | 2010 |
| Ethylbenzene | MR | 2 | 2010 |
| Tetrachloroethylene | MR | 2 | 2010 |
| DICHLOROMETHANE | MR | 2 | 2010 |
| 1,1,2-Trichloroethane | MR | 2 | 2010 |
| Revised Total Coliform Rule | MCL | 2 | 2022 |
| Benzene | MR | 2 | 2010 |
| 1,1-Dichloroethylene | MR | 2 | 2010 |
| 1,2-Dichloroethane | MR | 2 | 2010 |
| Trichloroethylene | MR | 2 | 2010 |
| 1,1,1-Trichloroethane | MR | 2 | 2010 |
| Lead and Copper Rule | TT | 2 | 1993 |
| Coliform (TCR) | MCL | 2 | 1998 |
| 1,2,4-Trichlorobenzene | MR | 2 | 2010 |
| Carbon tetrachloride | MR | 2 | 2010 |
| Toluene | MR | 2 | 2010 |
| 1,2-Dichloropropane | MR | 2 | 2010 |
| Xylenes, Total | MR | 2 | 2010 |
| Styrene | MR | 2 | 2010 |
| p-Dichlorobenzene | MR | 2 | 2010 |
| Arsenic | MR | 1 | 2014 |
| Lead and Copper Rule | MR | 1 | 2013 |
| Nitrite | MR | 1 | 2007 |
| Nitrite | MCL | 1 | 2002 |
| Coliform (TCR) | MR | 1 | 2008 |
Violation Count vs. the National Corpus
Wilmington Water Dept has 65 recorded EPA violations, 63% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 36% carry more. 11% of this system's own violations are health-based (7 of 65), and it ranks #2,464 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)
65 Around the middle fewer violations than 36% 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. 3 of 290 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFMPA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 4:2 FTS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| HFPO-DA | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/4/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFUnA | 8/4/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFEESA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/4/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/4/2025 | 7.90 ppt | 5.00 ppt | Detected |
| NFDHA | 8/4/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMPA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 8/4/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFTrDA | 8/4/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| NEtFOSAA | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/4/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFEESA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/4/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 8/4/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFDA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 8/4/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
UCMR5 PFAS record for Wilmington Water Dept
Open EPA SDWIS federal reports for PWS MA3342000 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
65 violations · 22,481 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 Wilmington 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.