Suffolk, NY
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.
Environmental data for Suffolk in New York · Population: 1,525,680
TRI sites such as National Grid Northport Power Station; Magellan Aerospace Processing Long Island Inc.; U.S. Doe Brookhaven National Laboratory; SDWIS systems such as SUFFOLK COUNTY WATER AUTHORITY; SOUTH HUNTINGTON WATER DISTRICT; SOUTH FARMINGDALE WD; NPL sites such as Action Anodizing, Plating, & Polishing Corp.; BioClinical Laboratories, Inc.; Brookhaven National Laboratory (USDOE) anchor Suffolk, NY's EPA extract. Derived burden score 91/100 (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 Suffolk include SUFFOLK COUNTY WATER AUTHORITY; RIVERHEAD WATER DISTRICT; ROBERT MOSES STATE PARK, while National Grid Northport Power Station leads reported TRI pounds among local Form R filers. AQS median AQI 38 / peak 133 in 2024.
Burden score 91/100 (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 Suffolk -- 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 Suffolk, NY: EPA TRI 2023 reporting year
Same facilities, both years
-27.0%
32 facilities that filed in 2022 and 2023
Whole inventory
-29.7%
361.5 thousand lb → 254.0 thousand lb, every facility that filed
Between the two reporting years, 3 facilities filed for the first time and 5 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Suffolk, NY's total reported releases fell from 341.2 thousand lb in 2022 to 249.2 thousand lb in 2023, based on EPA TRI filings.
- Suffolk, NY's land releases fell from 123 lb in 2022 to 54 lb in 2023, based on EPA TRI filings.
- Suffolk, NY's air releases fell from 268.3 thousand lb in 2022 to 186.1 thousand lb in 2023, based on EPA TRI filings.
- Suffolk, NY's off-site transfers fell from 72.8 thousand lb in 2022 to 63.1 thousand 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 | 291 (80%) | 69 | 6 | 133 |
| 2023 | 278 (76%) | 74 | 11 | 195 |
| 2022 | 272 (75%) | 85 | 8 | 133 |
| 2021 | 281 (77%) | 73 | 10 | 154 |
| 2020 | 282 (77%) | 78 | 6 | 133 |
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 York, see the EPA's AirNow.gov.
Water Systems (30)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SUFFOLK COUNTY WATER AUTHORITY | 1,100,000 | 3 |
| SOUTH HUNTINGTON WATER DISTRICT | 81,760 | 0 |
| SOUTH FARMINGDALE WD | 44,700 | 0 |
| GREENLAWN WATER DISTRICT | 42,000 | 0 |
| RIVERHEAD WATER DISTRICT | 35,000 | 3 |
| DIX HILLS WATER DISTRICT | 34,522 | 0 |
| SMITHTOWN WATER DISTRICT | 19,635 | 0 |
| HAMPTON BAYS WATER DISTRICT | 12,500 | 0 |
| ROBERT MOSES STATE PARK | 11,600 | 2 |
| ST JAMES WATER DISTRICT | 10,587 | 0 |
| FARMINGDALE (V) | 8,744 | 0 |
| OCEAN BEACH WATER DISTRICT | 4,500 | 3 |
| BROOKHAVEN NATIONAL LABORATORY | 3,500 | 0 |
| NORTHPORT VA HOSPITAL | 3,088 | 0 |
| GREENPORT WATER DISTRICT | 2,050 | 0 |
| RIVERSIDE WATER DISTRICT | 2,050 | 0 |
| SALTAIRE WATER DISTRICT | 2,000 | 1 |
| SEAVIEW WATER COMPANY | 1,400 | 0 |
| CALVERTON HILLS OWNERS ASSOCIATION | 897 | 2 |
| SHELTER ISLAND HEIGHTS ASSOCIATION | 500 | 1 |
| FISHERS ISLAND WATER WORKS | 380 | 12 |
| WEST GILGO BEACH ASSOCIATION | 300 | 0 |
| DIAMOND WOODS ESTATES MHP | 150 | 1 |
| SIDNEY-UNADILLA TRAILER PARK | 122 | 0 |
| WEST NECK WATER DISTRICT | 100 | 2 |
| OAK BEACH PUBLIC WATER SUPPLY | 66 | 0 |
| NEWTOWN HILL TRAILER PARK | 50 | 0 |
| PECONIC VIEW MOBILE HOME PARK | 40 | 1 |
| MAIDSTONE PARK COTTAGES | 34 | 1 |
| DERING HARBOR WATER DISTRICT | 14 | 4 |
TRI Facilities (43)
Superfund Sites (16)
| Site Name | Status | HRS Score |
|---|---|---|
| Action Anodizing, Plating, & Polishing Corp. | Deleted NPL Site | 34.72 |
| BioClinical Laboratories, Inc. | Deleted NPL Site | 32.91 |
| Brookhaven National Laboratory (USDOE) | NPL Site | 39.92 |
| Circuitron Corp. | NPL Site | 54.27 |
| Computer Circuits | NPL Site | 50.00 |
| Goldisc Recordings, Inc. | NPL Site | 33.39 |
| Islip Municipal Sanitary Landfill | NPL Site | 33.39 |
| Kenmark Textile Corp. | Deleted NPL Site | 31.72 |
| Lawrence Aviation Industries, Inc. | NPL Site | 50.00 |
| MacKenzie Chemical Works, Inc. | NPL Site | 50.00 |
| North Sea Municipal Landfill | Deleted NPL Site | 33.74 |
| Preferred Plating Corp. | NPL Site | 35.06 |
| Rowe Industries Ground Water Contamination | NPL Site | 31.94 |
| Smithtown Ground Water Contamination | Deleted NPL Site | 50.00 |
| SMS Instruments, Inc. | Deleted NPL Site | 37.32 |
| Tronic Plating Co., Inc. | Deleted NPL Site | 45.14 |
Cities in Suffolk (51)
Frequently Asked Questions
What is the environmental risk level in Suffolk, New York? ▼
Are there Superfund sites in Suffolk? ▼
How many toxic release facilities are in Suffolk? ▼
What is the air quality in Suffolk? ▼
Is the drinking water safe in Suffolk? ▼
What environmental agencies cover Suffolk? ▼
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.