Nassau, 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 Nassau in New York · Population: 1,388,138
TRI sites such as National Grid E.f. Barrett Power Station; Oerlikon Metco (us) Inc; Lnd Inc; SDWIS systems such as LIBERTY UTILITIES NEW YORK - LYNBROOK; LIBERTY UTILITIES NEW YORK - MERRICK; WA OF WESTERN NASSAU; NPL sites such as Anchor Chemicals; Applied Environmental Services; Claremont Polychemical anchor Nassau, NY's EPA extract. Derived burden score 76/100 (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 Nassau include LIBERTY UTILITIES NEW YORK - LYNBROOK; LIBERTY UTILITIES NEW YORK - MERRICK; LONG BEACH CITY, while National Grid E.f. Barrett Power Station leads reported TRI pounds among local Form R filers. AQS median AQI 31 / peak 71 in 2024.
Burden score 76/100 (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 Nassau -- 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 Nassau, NY: EPA TRI 2023 reporting year
Same facilities, both years
+5.1%
10 facilities that filed in 2022 and 2023
Whole inventory
+5.1%
74.8 thousand lb → 78.6 thousand lb, every facility that filed
Between the two reporting years, 1 facility filed for the first time and 1 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- Nassau, NY's total reported releases rose from 74.8 thousand lb in 2022 to 78.6 thousand lb in 2023, based on EPA TRI filings.
- Nassau, NY's water releases rose from 31 lb in 2022 to 42 lb in 2023, based on EPA TRI filings.
- Nassau, NY's off-site transfers rose from 15.7 thousand lb in 2022 to 19.0 thousand lb in 2023, based on EPA TRI filings.
- Nassau, NY's air releases rose from 59.0 thousand lb in 2022 to 59.6 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 | 308 (84%) | 58 | 0 | 71 |
| 2023 | 275 (75%) | 86 | 1 | 197 |
| 2022 | 303 (84%) | 58 | 0 | 68 |
| 2021 | 291 (81%) | 68 | 1 | 118 |
| 2020 | 317 (88%) | 44 | 0 | 75 |
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 (65)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| LIBERTY UTILITIES NEW YORK - LYNBROOK | 220,000 | 7 |
| LIBERTY UTILITIES NEW YORK - MERRICK | 135,000 | 7 |
| WA OF WESTERN NASSAU | 120,000 | 0 |
| TOWN OF HEMPSTEAD WATER DEPARTMENT | 110,000 | 0 |
| JERICHO WD | 58,000 | 0 |
| HEMPSTEAD (V) | 56,000 | 0 |
| HICKSVILLE WD | 48,000 | 0 |
| FREEPORT (V) | 45,000 | 0 |
| MANHASSET LAKEVILLE WD | 43,000 | 0 |
| MASSAPEQUA WD | 43,000 | 0 |
| LONG BEACH CITY | 35,000 | 1 |
| PORT WASHINGTON WD | 34,000 | 2 |
| WEST HEMPSTEAD WD | 32,031 | 0 |
| WA OF GREAT NECK NORTH | 31,400 | 0 |
| GLEN COVE CITY | 28,000 | 0 |
| ROCKVILLE CENTRE (V) | 24,700 | 0 |
| GARDEN CITY (V) | 23,272 | 0 |
| MINEOLA (V) | 20,600 | 0 |
| WESTBURY WD | 20,500 | 0 |
| FRANKLIN SQUARE WD | 20,000 | 0 |
| GARDEN CITY PARK WD | 18,000 | 0 |
| ROSLYN WD | 17,000 | 0 |
| ALBERTSON WD | 13,500 | 0 |
| LIBERTY UTILITIES NEW YORK - SEA CLIFF | 13,400 | 0 |
| CARLE PLACE WD | 9,005 | 0 |
| OYSTER BAY WD | 8,700 | 0 |
| LOCUST VALLEY WD | 7,500 | 0 |
| WILLISTON PARK (V) | 7,287 | 1 |
| BAYVILLE (V) | 6,700 | 0 |
| OLD WESTBURY (V) | 4,700 | 0 |
| SANDS POINT (V) | 2,900 | 6 |
| EAST WILLISTON (V) | 2,556 | 0 |
| LIDO-POINT LOOKOUT WD | 2,000 | 1 |
| PLANDOME (V) | 1,600 | 0 |
| CATHEDRAL GARDENS WD | 1,500 | 0 |
| MOUNT EBO WS | 1,500 | 0 |
| LAKE LENAPE WATER CO | 1,250 | 6 |
| GLENWOOD WD | 1,000 | 0 |
| WILD OAKS WATER COMPANY | 805 | 1 |
| KINGSVALE WATER CO | 600 | 0 |
| HUDSON VALLEY WATER CO #1 | 525 | 0 |
| DYKEER WATER CO. | 480 | 2 |
| WEST BRANCH ACRES | 292 | 0 |
| LIBERTY UTILITIES NEW YORK - MILL NECK | 280 | 0 |
| HUDSON VALLEY WATER CO #2 | 225 | 0 |
| HUDSON VALLEY WATER CO #4 | 221 | 0 |
| ARBOR HILLS WATER WORKS | 180 | 0 |
| SHEPHERDS RUN | 150 | 2 |
| BLUEBERRY RIDGE MOBILE VILLAGE | 138 | 0 |
| PINEWOOD PARK | 108 | 0 |
| ROLLING ACRES MHP | 100 | 28 |
| CASTAGNA WELLNESS WATER COMPANY | 100 | 0 |
| FRESH MEADOWS PWS | 100 | 2 |
| GRISWOLD MHP LLC | 99 | 3 |
| NORMANDY RYZE LLC | 75 | 0 |
| HUDSON VALLEY WATER CO #5 | 75 | 0 |
| GEORGETOWN BLUFFS | 75 | 0 |
| MARSH BROOK ESTATES | 70 | 0 |
| SPRING GLEN LAKE | 68 | 1 |
| HUDSON VALLEY WATER CO #3 | 56 | 0 |
| STONEY RIDGE VILLAGE | 54 | 2 |
| HOEY-DE GRAW WATERWORKS | 50 | 0 |
| COUNTRY POINTE APARTMENTS | 35 | 0 |
| LAKE LODGES APARTMENTS | 30 | 0 |
| PLEASANT VALLEY GARDEN APARTMENTS | 30 | 0 |
TRI Facilities (17)
| # | Facility | Total Releases |
|---|---|---|
| 1 | National Grid E.f. Barrett Power Station | 265.9K lbs |
| 2 | Oerlikon Metco (us) Inc | 44.5K lbs |
| 3 | Lnd Inc | 20.2K lbs |
| 4 | Global Cos LLC Inwood Terminal | 16.3K lbs |
| 5 | Sprague Lawrence Terminal | 9.4K lbs |
| 6 | Shell Long Island Terminal | 9.2K lbs |
| 7 | Global Cos LLC Glenwood Landing Terminal | 7.4K lbs |
| 8 | Commander Terminals LLC | 607 lbs |
| 9 | John Hassall LLC | 20 lbs |
| 10 | Aero Structures Long Island Inc. | 15 lbs |
| 11 | Mill-Max Manufacturing Corp | 3 lbs |
| 12 | American Casting & Manufacturing Corp | 1 lbs |
| 13 | Wego Chemical Group | 0 lbs |
| 14 | Greenfield Industries Inc | 0 lbs |
| 15 | Arrow Chemical Corp. | 0 lbs |
| 16 | Kozy Shack LLC | 0 lbs |
| 17 | Northrop Grumman Systems Corp | 0 lbs |
Superfund Sites (18)
| Site Name | Status | HRS Score |
|---|---|---|
| Anchor Chemicals | Deleted NPL Site | 37.20 |
| Applied Environmental Services | NPL Site | 41.15 |
| Claremont Polychemical | NPL Site | 31.62 |
| Fulton Avenue | NPL Site | 33.08 |
| Genzale Plating Co. | NPL Site | 33.79 |
| Hooker Chemical & Plastics Corp./Ruco Polymer Corp. | NPL Site | 41.60 |
| Jackson Steel | Deleted NPL Site | 50.00 |
| Li Tungsten Corp. | NPL Site | 50.00 |
| Liberty Industrial Finishing | NPL Site | 50.65 |
| Mattiace Petrochemical Co., Inc. | NPL Site | 31.90 |
| New Cassel/Hicksville Ground Water Contamination | NPL Site | 50.00 |
| Old Bethpage Landfill | NPL Site | 58.83 |
| Old Roosevelt Field Contaminated Ground Water Area | NPL Site | 50.00 |
| Pasley Solvents & Chemicals, Inc. | Deleted NPL Site | 39.65 |
| Peninsula Boulevard Ground Water Plume | NPL Site | 50.00 |
| Port Washington Landfill | NPL Site | 45.46 |
| Stanton Cleaners Area Ground Water Contamination | NPL Site | 35.76 |
| Syosset Landfill | Deleted NPL Site | 54.27 |
Cities in Nassau (46)
Frequently Asked Questions
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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.