King, WA
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 King in Washington · Population: 2,262,713
TRI sites such as Nucor Steel Seattle Inc; Emerald Services Inc.; Rexam Beverage Can Co Re: Kent Wa Facility; SDWIS systems such as SEATTLE PUBLIC UTILITIES; KENT WATER DEPARTMENT; RENTON CITY OF; NPL sites such as Harbor Island (Lead); Lockheed West Seattle; Lower Duwamish Waterway anchor King, WA'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 King include SEATTLE PUBLIC UTILITIES; KING COUNTY WATER DISTRICT #54; WATER DISTRICT 19, while Nucor Steel Seattle Inc leads reported TRI pounds among local Form R filers. AQS median AQI 41 / peak 119 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 King -- 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 King, WA: EPA TRI 2023 reporting year
Same facilities, both years
+4.2%
60 facilities that filed in 2022 and 2023
Whole inventory
+4.4%
1.1 million lb → 1.2 million lb, every facility that filed
Between the two reporting years, 2 facilities filed for the first time and 3 stopped filing. Facilities entering or leaving the inventory are excluded from the same-facility comparison above.
- King, WA's total reported releases rose from 1.1 million lb in 2022 to 1.2 million lb in 2023, based on EPA TRI filings.
- King, WA's land releases rose from 7 lb in 2022 to 24 lb in 2023, based on EPA TRI filings.
- King, WA's chemicals reported fell from 58 in 2022 to 52 in 2023, based on EPA TRI filings.
- King, WA's air releases rose from 442.8 thousand lb in 2022 to 477.0 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 | 255 (70%) | 108 | 3 | 119 |
| 2023 | 214 (59%) | 145 | 5 | 165 |
| 2022 | 216 (59%) | 130 | 14 | 237 |
| 2021 | 248 (68%) | 112 | 3 | 177 |
| 2020 | 248 (68%) | 106 | 3 | 299 |
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 Washington, see the EPA's AirNow.gov.
Water Systems (133)
| System | System pop (SDWIS) | Violations |
|---|---|---|
| SEATTLE PUBLIC UTILITIES | 1,161,961 | 4 |
| KENT WATER DEPARTMENT | 166,421 | 0 |
| RENTON CITY OF | 108,091 | 0 |
| Auburn City of | 107,655 | 0 |
| HIGHLINE WATER DISTRICT | 100,170 | 0 |
| NORTHSHORE UTILITY DISTRICT | 99,789 | 0 |
| SAMMAMISH PLATEAU WATER & SEWER | 79,362 | 0 |
| SOOS CREEK WATER & SEWER DISTRICT | 74,172 | 0 |
| KIRKLAND CITY OF | 69,243 | 0 |
| WOODINVILLE WATER DISTRICT | 66,699 | 0 |
| COVINGTON WATER DISTRICT | 56,172 | 0 |
| KING COUNTY WATER DISTRICT #20 | 48,469 | 0 |
| ISSAQUAH WATER SYSTEM | 43,584 | 0 |
| TUKWILA WATER DEPARTMENT | 36,298 | 0 |
| BOTHELL WATER CITY OF | 33,643 | 0 |
| North City Water District | 32,847 | 0 |
| MERCER ISLAND CITY OF | 31,057 | 0 |
| CEDAR RIVER WATER & SEWER DISTRICT | 28,671 | 0 |
| Lake Meridian Water District | 24,231 | 0 |
| KING COUNTY WATER DISTRICT #49 | 23,492 | 0 |
| ENUMCLAW WATER DEPARTMENT | 23,276 | 0 |
| KING COUNTY WATER DISTRICT #125 | 21,904 | 0 |
| SNOQUALMIE WATER | 20,222 | 0 |
| KING COUNTY WATER DISTRICT NO 90 | 20,100 | 0 |
| COAL CREEK UTILITY DISTRICT | 15,989 | 0 |
| SKYWAY WATER & SEWER | 12,036 | 0 |
| DUVALL CITY OF | 11,050 | 0 |
| NE SAMMAMISH SEWER & WATER DISTRICT | 9,702 | 0 |
| UNION HILL WATER ASSOCIATION INC | 8,720 | 0 |
| NORTH BEND CITY OF | 8,710 | 0 |
| SALLAL WATER ASSOCIATION INC | 6,600 | 0 |
| BLACK DIAMOND WATER DEPT | 6,407 | 0 |
| KING COUNTY WATER DISTRICT #54 | 5,373 | 4 |
| WATER DISTRICT 19 | 5,335 | 3 |
| KING COUNTY WATER DISTRICT 119 | 3,800 | 0 |
| ALGONA WATER DEPT | 3,300 | 0 |
| MUCKLESHOOT | 3,250 | 0 |
| AMES LAKE WATER ASSOC INC | 3,224 | 0 |
| LAKE FOREST PARK WATER DISTRICT | 3,171 | 0 |
| FALL CITY WATER DIST. #127 | 2,987 | 0 |
| HEIGHTS WATER | 2,051 | 0 |
| WILDERNESS RIM ASSOCIATION | 1,867 | 0 |
| RIVER BEND HOA | 1,603 | 0 |
| DOCKTON WATER ASSOCIATION | 992 | 0 |
| BURTON WATER COOPERATIVE | 964 | 0 |
| WESTSIDE WATER ASSN | 562 | 0 |
| SUGARLOAF WATER SYSTEM | 468 | 0 |
| MAPLEWOOD ADDITION WATER COOP | 435 | 0 |
| ECHO GLEN CHILDRENS CENTER | 430 | 0 |
| LAKE MARGARET WATER SYSTEM | 406 | 0 |
| LAKE RETREAT CAMP & CONF CENTER | 404 | 0 |
| Gold Beach Water Company | 390 | 0 |
| RAVENSDALE WATER SUPPLY | 389 | 0 |
| BEAUX ARTS WATER DEPARTMENT | 345 | 0 |
| SULTAN ESTATES WATER SYSTEM | 340 | 0 |
| SKYKOMISH WATER DEPT | 324 | 0 |
| CRYSTAL RIVER RANCH ASSOC | 302 | 0 |
| LIBERTY ESTATES | 300 | 0 |
| Highlands Utility District | 275 | 0 |
| WESTERN RANCHETTES INC. | 250 | 0 |
| Ravenwing Ranch | 250 | 0 |
| SPRING GLEN ASSOCIATION | 245 | 0 |
| MAURY MUTUAL WATER CO | 233 | 0 |
| PCM ARIA MARION LLC | 230 | 0 |
| FOUR LAKES | 212 | 0 |
| SOUTH AUBURN WATER ASSOCIATION | 212 | 0 |
| MOUNT SI MOBILE HOME ESTATES | 200 | 0 |
| LOCLOMAN SUBDIVISION | 174 | 0 |
| CRYSTAL LAKE INC | 170 | 0 |
| MAYFIELD RV PARK | 165 | 0 |
| LAKE MERIDIAN ESTATES (MHP) | 154 | 0 |
| UPPER PRESTON WATER ASSN | 150 | 0 |
| CRYSTAL VILLAGE I-II-III | 146 | 0 |
| MARIANI WATER SYSTEM INC | 138 | 0 |
| VALLEY MOBILE HOME PARK | 120 | 0 |
| CHERRYWOOD MOBILE HOME MANOR | 120 | 0 |
| EDGEHILL WATER ASSN | 109 | 0 |
| RUMBOLZ SUNSET WATER SYSTEM | 106 | 0 |
| Creekside Apartments | 100 | 0 |
| SUN AIRE ESTATES | 98 | 0 |
| SPRING GLEN MOBILE HOME PARK | 96 | 0 |
| MOUNTAIN VIEW WATER DISTRICT INC | 91 | 0 |
| COUNTRY HOMES MOBILE PARK | 90 | 0 |
| I 94 MOBILE HOME PARK | 90 | 2 |
| RAKWANNA PARK WATER SYS INC | 90 | 0 |
| Lake Alice Water Association | 90 | 0 |
| SUNNYSLOPE MUTUAL WATER SYSTEM | 85 | 0 |
| NEW HORIZONS MOBILE/RV PARK | 82 | 0 |
| ISSAQUAH VALLEY WATER ASSN #1 | 80 | 1 |
| GREEN MOUNTAIN MOBILE RANCH | 80 | 0 |
| CRESTVIEW TRACTS #3 | 77 | 0 |
| RAINBOW ROCK MHP | 75 | 0 |
| LAKE WILDERNESS SHORE ACRES ESTATE | 75 | 0 |
| QUARTERMASTER HEIGHTS WATER ASSN | 70 | 0 |
| HIDDEN VILLAGE MHP, LLC | 66 | 2 |
| VALLEYBROOK VILLAGE | 65 | 0 |
| STONE CREEK ESTATES WATER ASSN. | 62 | 1 |
| MONTIPARK LLC | 60 | 6 |
| GOLF MHP | 60 | 41 |
| FALL CITY WATER DIST. (PLUM CREEK) | 59 | 2 |
| ALPINE WATER ASSOCIATION | 58 | 0 |
| MAPLE VISTA | 57 | 0 |
| FALL CITY WATER DIST.(SPRING HILL) | 57 | 18 |
| HOT SPRINGS COURT | 55 | 40 |
| CHAMONIX VILLAGE | 53 | 0 |
| TIMBERLANE VILLAGE WATER | 51 | 0 |
| BRUNSWICK HILLS MHP | 50 | 1 |
| LAKE SERENE WATER SYSTEM | 50 | 0 |
| NEEDLE CREEK WATER SYSTEM | 50 | 1 |
| FALL CITY WATER DIST. (RUTH) | 49 | 0 |
| NORWEST MOBILE HOME PARK | 49 | 0 |
| TERRACE SQUARE APTS | 45 | 0 |
| ALPINE MOBILE MANOR | 45 | 0 |
| SHAWNEE HILL CONDOMINIUM WS | 44 | 0 |
| EVERGREEN SKY RANCH COMMUNITY WTR | 43 | 0 |
| BRIDLE TRAILS SOUTH WATER SYSTEM | 42 | 0 |
| RIVER VILLAGE MHP | 40 | 25 |
| AGATE BAY MHP | 40 | 0 |
| NEW ARCADIA WATER SYSTEM | 40 | 0 |
| WELLS WATER ASSOCIATION | 39 | 0 |
| LAKE RETREAT FIRS #2 WATER ASSOC. | 38 | 0 |
| MARINE ESTATES MUTUAL WATER ASSN | 38 | 0 |
| NOBLE WOODS WATER SYSTEM | 37 | 0 |
| REED RANCH ROAD WATER | 36 | 0 |
| GROTTO WATER ASSOCIATION | 36 | 0 |
| BRAUNWOOD ESTATES | 35 | 0 |
| RAVENSDALE MOBILE HOME PARK | 34 | 0 |
| BILLINGTON | 34 | 0 |
| TOKUL CREEK COMMUNITY | 34 | 0 |
| SAWYERWOOD WATER SYSTEM | 32 | 0 |
| CHICO HEIGHTS COMMUNITY | 30 | 0 |
| TIGER MTN TRACTS | 30 | 0 |
| 165th Ave Water System | 24 | 0 |
TRI Facilities (50)
Superfund Sites (10)
| Site Name | Status | HRS Score |
|---|---|---|
| Harbor Island (Lead) | NPL Site | 34.60 |
| Lockheed West Seattle | NPL Site | 50.00 |
| Lower Duwamish Waterway | NPL Site | 50.00 |
| Midway Landfill | NPL Site | 54.27 |
| Pacific Car & Foundry Co. | NPL Site | 42.33 |
| Pacific Sound Resources | NPL Site | 70.71 |
| Queen City Farms | NPL Site | 34.38 |
| Quendall Terminals | NPL Site | 50.00 |
| Seattle Municipal Landfill (Kent Highlands) | NPL Site | 52.19 |
| Western Processing Co., Inc. | NPL Site | 58.63 |
Cities in King (36)
Frequently Asked Questions
What is the environmental risk level in King, Washington? ▼
Are there Superfund sites in King? ▼
How many toxic release facilities are in King? ▼
What is the air quality in King? ▼
Is the drinking water safe in King? ▼
What environmental agencies cover King? ▼
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.