Community Water System · PWS NJ1225001
Middlesex Water Company
Operator location Iselin, New Jersey - larger served population (> 3,309) at 233,376 people served; 87 SDWIS violations on record from surface water sources.
- 233,376
- People served (this PWS)
- 87
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- 4 PFAS
- UCMR5 (this PWS)
Middlesex Water Company standing, high SDWIS violation third
233,376 people served (SDWIS) - larger served population (> 3,309). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). UCMR5: middle-third PFAS panel (≤ 4 compounds). Population rank #166 of 29,740 among systems serving 500+.
The verdict
Middlesex Water Company sits in the upper third of the sitemap cohort by violation count (87), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (233,376; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 5% (middle-third health share (≤ 23%)). UCMR5 detected 4 PFAS compounds (middle-third PFAS panel (≤ 4 compounds)).
- #166 of 29,740
- Population · /systems
- #8 of 689
- Population · NJ
- 87
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 58,344
- County
- Middlesex
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 75
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 14 | 2023 |
| TTHM | MR | 5 | 2014 |
| Nitrate | MR | 4 | 2014 |
| Consumer Confidence Rule | Other | 4 | 2020 |
| Lead and Copper Rule | TT | 4 | 2019 |
| Chromium | MR | 3 | 2005 |
| CYANIDE | MR | 3 | 2005 |
| cis-1,2-Dichloroethylene | MR | 2 | 1998 |
| DICHLOROMETHANE | MR | 2 | 1998 |
| o-Dichlorobenzene | MR | 2 | 1998 |
| 1,1-Dichloroethylene | MR | 2 | 1998 |
| trans-1,2-Dichloroethylene | MR | 2 | 1998 |
| 1,2-Dichloroethane | MR | 2 | 1998 |
| Carbon tetrachloride | MR | 2 | 1998 |
| CHLOROBENZENE | MR | 2 | 1998 |
| 1,2,4-Trichlorobenzene | MR | 2 | 1998 |
| p-Dichlorobenzene | MR | 2 | 1998 |
| Vinyl chloride | MR | 2 | 1998 |
| 1,1,1-Trichloroethane | MR | 2 | 1998 |
| Trichloroethylene | MR | 2 | 1998 |
| Tetrachloroethylene | MR | 2 | 1998 |
| Benzene | MR | 2 | 1998 |
| Toluene | MR | 2 | 1998 |
| Ethylbenzene | MR | 2 | 1998 |
| Chlorine | MR | 2 | 2015 |
| Xylenes, Total | MR | 2 | 1998 |
| Coliform (TCR) | MR | 2 | 2013 |
| Styrene | MR | 2 | 1998 |
| 1,1,2-Trichloroethane | MR | 2 | 1998 |
| 1,2-Dichloropropane | MR | 2 | 1998 |
Violation Count vs. the National Corpus
Middlesex Water Company has 87 recorded EPA violations, 70% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 30% carry more. 5% of this system's own violations are health-based (4 of 87), and it ranks #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)
87 Around the middle fewer violations than 30% 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. 11 of 290 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| ADONA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDoA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 8/13/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 8/13/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 8/13/2024 | 3.50 ppt | 3.00 ppt | Detected |
| PFDA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/13/2024 | 4.50 ppt | 4.00 ppt | Detected |
| PFOS | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| NMeFOSAA | 8/13/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFHxS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 8/13/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| NEtFOSAA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 8/13/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFBS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 8/13/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFPeS | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 6:2 FTS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/13/2024 | 3.30 ppt | 3.00 ppt | Detected |
| PFMPA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTA | 8/13/2024 | <8.00 ppt | 8.00 ppt | Not Detected |
| NMeFOSAA | 8/13/2024 | <6.00 ppt | 6.00 ppt | Not Detected |
| 8:2 FTS | 8/13/2024 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 8/13/2024 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 8/13/2024 | 4.90 ppt | 3.00 ppt | Detected |
| PFMPA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTrDA | 8/13/2024 | <7.00 ppt | 7.00 ppt | Not Detected |
| 4:2 FTS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 8/13/2024 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 8/13/2024 | 6.50 ppt | 4.00 ppt | Detected |
| PFDA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 8/13/2024 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 8/13/2024 | <2.00 ppt | 2.00 ppt | Not Detected |
Population served record for Middlesex Water Company
EPA SDWIS lists 233,376 people served and 58,344 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · NJ DEP, Bureau of Safe Drinking Water
Nationwide peers
87 violations · 233,376 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 Middlesex Water Company
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New Jersey compares on the same EPA violation measures. New Jersey 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.