King, WA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology. This is a different measure than the EJ Screening score for this county, which ranks it by percentile against every other tracked county rather than against fixed national thresholds.
Environmental data for King in Washington · Population: 2,262,713
King, WA is tracked across three EPA datasets covering 50 Toxics Release Inventory (TRI) facilities, 129 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 72/100 (High Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 8.2M lbs of reported toxic releases under EPCRA Section 313, while 14 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 41 and a peak AQI of 119 in 2024, with 70% of observed days rated "Good" (0–50).
All figures below draw directly from federal EPA records, TRI self-reported emissions, SDWIS compliance history, NPL Hazard Ranking System scores, and AQS daily AQI summaries, and are not adjusted, weighted, or forecast. A past violation or elevated score does not itself indicate current unsafe conditions; it documents the regulatory and disclosure history publicly filed with the U.S. Environmental Protection Agency through the most recent reporting cycle.
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 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 (129)
| System | Population | Violations |
|---|---|---|
| SEATTLE PUBLIC UTILITIES | 1,091,904 | 3 |
| KENT WATER DEPARTMENT | 166,421 | 0 |
| HIGHLINE WATER DISTRICT | 115,950 | 0 |
| Auburn City of | 113,095 | 0 |
| RENTON CITY OF | 107,119 | 0 |
| NORTHSHORE UTILITY DISTRICT | 105,105 | 0 |
| SAMMAMISH PLATEAU WATER & SEWER | 79,362 | 0 |
| KIRKLAND CITY OF | 67,107 | 0 |
| SOOS CREEK WATER & SEWER DISTRICT | 64,534 | 0 |
| WOODINVILLE WATER DISTRICT | 59,873 | 0 |
| COVINGTON WATER DISTRICT | 52,276 | 0 |
| TUKWILA WATER DEPARTMENT | 45,374 | 0 |
| ISSAQUAH WATER SYSTEM | 43,584 | 0 |
| KING COUNTY WATER DISTRICT #20 | 38,974 | 0 |
| North City Water District | 31,744 | 0 |
| MERCER ISLAND CITY OF | 30,689 | 0 |
| CEDAR RIVER WATER & SEWER DISTRICT | 28,671 | 0 |
| Lake Meridian Water District | 24,231 | 0 |
| ENUMCLAW WATER DEPARTMENT | 23,276 | 0 |
| KING COUNTY WATER DISTRICT NO 90 | 20,100 | 0 |
| KING COUNTY WATER DISTRICT #125 | 17,546 | 0 |
| KING COUNTY WATER DISTRICT #49 | 16,065 | 0 |
| COAL CREEK UTILITY DISTRICT | 15,989 | 0 |
| SNOQUALMIE WATER | 15,848 | 0 |
| SKYWAY WATER & SEWER | 12,036 | 0 |
| DUVALL CITY OF | 10,267 | 0 |
| UNION HILL WATER ASSOCIATION INC | 8,720 | 0 |
| NE SAMMAMISH SEWER & WATER DISTRICT | 8,516 | 0 |
| NORTH BEND CITY OF | 7,228 | 0 |
| SALLAL WATER ASSOCIATION INC | 6,600 | 0 |
| KING COUNTY WATER DISTRICT 119 | 3,796 | 0 |
| WATER DISTRICT 19 | 3,723 | 3 |
| MUCKLESHOOT | 3,250 | 0 |
| AMES LAKE WATER ASSOC INC | 3,224 | 0 |
| ALGONA WATER DEPT | 3,180 | 0 |
| LAKE FOREST PARK WATER DISTRICT | 3,171 | 0 |
| FALL CITY WATER DIST. #127 | 2,987 | 0 |
| BLACK DIAMOND WATER DEPT | 2,420 | 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 |
| 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 |
| INDIAN RIDGE WATER ASSOCIATION | 216 | 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 |
| 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 | 32 |
| 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 | 30 |
| 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 | 24 |
| AGATE BAY MHP | 40 | 0 |
| NEW ARCADIA WATER SYSTEM | 39 | 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 |
| RAVENSDALE MOBILE HOME PARK | 34 | 0 |
| BILLINGTON | 34 | 0 |
| TOKUL CREEK COMMUNITY | 34 | 0 |
| SAWYERWOOD WATER SYSTEM | 32 | 0 |
| BRAUNWOOD ESTATES | 30 | 0 |
| CHICO HEIGHTS COMMUNITY | 30 | 0 |
| TIGER MTN TRACTS | 30 | 0 |
| 165th Ave Water System | 24 | 0 |
TRI Facilities (50)
Cities in King (15)
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.