Middlesex, NJ
Transparent derived index from EPA TRI / SDWIS / Superfund extracts: not an official EPA rating. Fixed caps: facilities ≤25 pts (50+ = max), log10 releases ≤25 pts, Superfund ≤25 pts (5/site), health-violation systems ≤15 pts (3/system), high-chemical facilities ≤10 pts. Bands: High ≥60, Moderate ≥30. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against other tracked counties rather than against these fixed caps.
Environmental data for Middlesex in New Jersey · Population: 861,535
TRI sites such as Madison Industries; Ashland Specialty Ingredients (parlin Plant); Ames Advanced Materials Corp; SDWIS systems such as MIDDLESEX WATER COMPANY; OLD BRIDGE MUA; NEW BRUNSWICK W DEPT; NPL sites such as Atlantic Resources Corporation; Chemical Insecticide Corp.; Chemsol, Inc. anchor Middlesex, NJ's EPA extract. Derived burden score 97/100 (High Risk) uses fixed national caps on density, log release volume, Superfund count, and health-flagged systems - not an official EPA rating.
Health-flagged SDWIS rows in Middlesex include MIDDLESEX WATER COMPANY; NEW BRUNSWICK W DEPT; PERTH AMBOY WATER DEPARTMENT, while Madison Industries leads reported TRI pounds among local Form R filers. AQS median AQI 36 / peak 136 in 2024.
Burden score 97/100 (High Risk) is the only weighted composite on this page. The tables below list every TRI facility, SDWIS system, and Superfund site EPA has on record for Middlesex -- not just the names called out above -- reproducing the disclosure history as filed, not a current-safety verdict. Extract current as of 2026-08-25.
Release-over-release change
What changed for Middlesex, NJ: EPA TRI 2023 reporting year
Same facilities, both years
+11.3%
57 facilities that filed in 2022 and 2023
Whole inventory
+11.3%
2.7 million lb → 3.0 million lb, every facility that filed
Between the two reporting years, 4 facilities filed for the first time and 0 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Middlesex, NJ's total reported releases rose from 2.7 million lb in 2022 to 3.0 million lb in 2023, based on EPA TRI filings.
- Middlesex, NJ's air releases fell from 213.3 thousand lb in 2022 to 150.0 thousand lb in 2023, based on EPA TRI filings.
- Middlesex, NJ's water releases rose from 88 lb in 2022 to 111 lb in 2023, based on EPA TRI filings.
- Middlesex, NJ's off-site transfers rose from 2.5 million lb in 2022 to 2.9 million lb in 2023, based on EPA TRI filings.
Air Quality History (2020–2024)
EPA Air Quality Index (AQI) data showing how many days per year fall into each air quality category.
| Year | Good | Moderate | Unhealthy (SG) | Max AQI |
|---|---|---|---|---|
| 2024 | 286 (78%) | 74 | 5 | 136 |
| 2023 | 229 (63%) | 124 | 7 | 247 |
| 2022 | 261 (72%) | 103 | 1 | 101 |
| 2021 | 233 (64%) | 126 | 5 | 129 |
| 2020 | 257 (70%) | 108 | 1 | 112 |
Source: EPA Air Quality System (AQS) Annual AQI by County AQI categories: Good (0-50), Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), Hazardous (301+)
For real-time air quality readings and pollutant breakdowns in New Jersey, see the EPA's AirNow.gov.
Water Systems (20)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| MIDDLESEX WATER COMPANY | 233,376 | 1 |
| OLD BRIDGE MUA | 68,000 | 0 |
| NEW BRUNSWICK W DEPT | 55,000 | 3 |
| PERTH AMBOY WATER DEPARTMENT | 52,328 | 8 |
| SAYREVILLE W DEPT | 45,345 | 0 |
| MONROE TWP UTILITY DEPARTMENT | 36,000 | 0 |
| EDISON WATER CO | 35,000 | 3 |
| SOUTH RIVER W DEPT | 16,000 | 14 |
| HIGHLAND PARK W DEPT | 14,000 | 1 |
| MATAWAN BOROUGH WATER DE | 9,084 | 5 |
| SPOTSWOOD W DEPT | 8,300 | 0 |
| MILLTOWN W DEPT | 7,000 | 25 |
| ABERDEEN - CLIFFWOOD/CLIFFWOOD BEACH | 6,775 | 5 |
| ABERDEEN- HIGH SCHOOL/OAKSHADE AREA | 2,123 | 0 |
| HELMETTA WATER DEPT | 2,000 | 0 |
| ITHACA ESTATES | 342 | 0 |
| ABERDEEN - FRENEAU | 286 | 0 |
| LITTLE CREEK ESTATES M H P | 60 | 0 |
| PORTVILLE ESTATES MHC II | 50 | 0 |
| PORTVILLE ESTATES MHC I | 28 | 0 |
TRI Facilities (50)
Superfund Sites (18)
| Site Name | Status | HRS Score |
|---|---|---|
| Atlantic Resources Corporation | NPL Site | 50.00 |
| Chemical Insecticide Corp. | NPL Site | 37.93 |
| Chemsol, Inc. | NPL Site | 42.69 |
| Cornell Dubilier Electronics, Inc. | NPL Site | 50.27 |
| CPS/Madison Industries | NPL Site | 69.73 |
| Evor Phillips Leasing | NPL Site | 36.64 |
| Fried Industries | NPL Site | 33.61 |
| Global Sanitary Landfill | NPL Site | 45.92 |
| Horseshoe Road | NPL Site | 51.37 |
| JIS Landfill | NPL Site | 45.14 |
| Kin-Buc Landfill | NPL Site | 50.64 |
| Middlesex Sampling Plant (USDOE) | NPL Site | 50.00 |
| Monroe Township Landfill | Deleted NPL Site | 42.37 |
| Raritan Bay Slag | NPL Site | 50.00 |
| Renora, Inc. | Deleted NPL Site | 40.44 |
| Sayreville Landfill | Deleted NPL Site | 37.05 |
| South Brunswick Landfill | Deleted NPL Site | 53.42 |
| Woodbrook Road Dump | NPL Site | 50.00 |
Cities in Middlesex (37)
Frequently Asked Questions
What is the environmental risk level in Middlesex, New Jersey? ▼
Are there Superfund sites in Middlesex? ▼
How many toxic release facilities are in Middlesex? ▼
What is the air quality in Middlesex? ▼
Is the drinking water safe in Middlesex? ▼
What environmental agencies cover Middlesex? ▼
What does this county environmental profile show?
This county environmental profile rolls up EPA Toxics Release Inventory facility reports, Safe Drinking Water Information System public-water-system filings, and Superfund National Priorities List sites for the county boundary defined by the U.S. Census Bureau. Facility counts reflect facilities with a reporting address inside the county, not where downstream environmental effects may be observed. Population figures are from the most recent Census ACS 5-year estimate. The county detail page is updated whenever the upstream EPA programs publish revised data; see the methodology page for the documented ingest cadence and the editorial choices governing how aggregations are computed.
Read our methodology - how this data is sourced, computed, and verified.