Okanogan, WA
A PlainEnviro-computed score from reported facility/violation counts, not an official EPA rating, health forecast, or population-adjusted rate. See methodology.
Environmental data for Okanogan in Washington · Population: 42,811
Okanogan, WA is tracked across three EPA datasets covering 1 Toxics Release Inventory (TRI) facility, 62 Safe Drinking Water Act systems, and 0 Superfund National Priorities List sites. Together these generate an environmental burden score of 22/100 (Low Risk), calibrated against national distributions for facility density, chemical release volume, Superfund concentration, and water-system health violations.
Industrial disclosures inside the county total 123 lbs of reported toxic releases under EPCRA Section 313, while 15 water systems carry an active health-based violation in the SDWIS record. EPA Air Quality System monitors logged a median AQI of 38 and a peak AQI of 102 in 2024, with 61% 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 | 225 (61%) | 140 | 1 | 102 |
| 2023 | 185 (51%) | 171 | 2 | 299 |
| 2022 | 175 (48%) | 185 | 4 | 248 |
| 2021 | 146 (40%) | 193 | 5 | 354 |
| 2020 | 196 (54%) | 157 | 1 | 618 |
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 (62)
| System | Population | Violations |
|---|---|---|
| OMAK CITY OF | 4,940 | 0 |
| OROVILLE CITY OF | 3,256 | 0 |
| BREWSTER CITY OF | 3,235 | 0 |
| OKANOGAN WATER DEPARTMENT CITY OF | 2,921 | 0 |
| TONASKET WATER SYSTEM | 2,392 | 0 |
| COULEE DAM WATER DEPT | 1,359 | 0 |
| WINTHROP TOWN OF | 1,350 | 0 |
| Monse-Riggan Camp | 1,165 | 3 |
| PATEROS WATER DEPARTMENT | 1,149 | 0 |
| TWISP TOWN OF | 1,044 | 0 |
| JAW FARMS INC | 636 | 0 |
| DUCK LAKE WATER ASSOCIATION | 635 | 0 |
| BREWSTER FLAT DOMESTIC WATER ASSN | 542 | 0 |
| INCHELIUM WATER DISTRICT | 540 | 3 |
| NESPELEM WATER DEPT | 510 | 0 |
| P AND G ORCHARDS CAMP 2 | 489 | 0 |
| NESPELEM AGENCY | 445 | 2 |
| RIVERSIDE TOWN OF | 429 | 0 |
| OMAK HUD | 380 | 8 |
| ELMER CITY WATER SYSTEM | 368 | 0 |
| KELLER | 340 | 6 |
| CORRAL SPRINGS WATER SYSTEM | 336 | 0 |
| PROGRESSIVE FLAT WATER ASSN | 335 | 1 |
| Crane Ranch | 329 | 0 |
| ROCKY RIVER ROAD COMMUNITY SITE | 260 | 8 |
| SANDFLAT WATER ASSOCIATION | 260 | 0 |
| SUNCREST PLAT WATER SYSTEM | 260 | 0 |
| COLEMAN BUTTE WATER ASSN | 250 | 0 |
| LOOMIS WATER USERS ASSN INC | 225 | 0 |
| HANSON HARBOR HOMEOWNERS ASSN | 220 | 0 |
| AFC RANCH 1 | 217 | 0 |
| RIVER ROAD MOBILE HOME PARK | 150 | 1 |
| ASTON ESTATES | 141 | 0 |
| AFC RANCH 2 | 125 | 0 |
| SEATONS GROVE | 115 | 4 |
| CRUMBACHER ESTATES WATER SYSTEM | 111 | 0 |
| MARTIN CREEK COMMUNITY ASSN | 108 | 14 |
| HOMESTEAD MOBILE HOME PARK | 105 | 0 |
| M J TRAILER RANCH | 100 | 0 |
| MALOTT | 95 | 8 |
| EDELWEISS MAINTENANCE COMMISSION | 95 | 0 |
| PINE FOREST WATER SYSTEM | 90 | 0 |
| OLD ORCHARD ESTATES WATER SYSTEM | 86 | 0 |
| LOST RIVER AIRPORT ASSOCIATION | 72 | 0 |
| WOLF CREEK PROPERTY OWNERS ASSN | 71 | 0 |
| PINECREST SUBDIVISON OWNERS | 63 | 0 |
| CASCADE FOOTHILLS | 61 | 0 |
| VISTA VUE WATER USERS ASSN | 60 | 0 |
| EMANUEL HEIGHTS WATER SYSTEM | 60 | 0 |
| WITHROW WATER WORKS | 60 | 2 |
| APPLEWAY TRAILER COURT | 54 | 0 |
| COLUMBIA SPRINGS ESTATES | 54 | 0 |
| JOHNSON CREEK WATER USERS ASSN | 48 | 2 |
| Robison Tract / Teeny | 46 | 0 |
| METHOW WATER SYSTEM INC | 45 | 0 |
| RIVERWOOD WATER SYSTEM | 43 | 0 |
| TWIN LAKES HUD | 42 | 9 |
| ELM TREE WATER & SEWER ASSN | 38 | 0 |
| MANY LAKES MOBILE HOME PARK | 37 | 0 |
| Valley View Estates Water System | 28 | 0 |
| TWIN PINES MOBILE HOME PARK | 25 | 0 |
| AZWELL ORCHARDS | 7 | 3 |
TRI Facilities (1)
| # | Facility | Total Releases |
|---|---|---|
| 1 | US Cbp Oroville Port of Entry WA0021 | 123 lbs |
Cities in Okanogan (2)
Frequently Asked Questions
What is the environmental risk level in Okanogan, Washington? ▼
Are there Superfund sites in Okanogan? ▼
How many toxic release facilities are in Okanogan? ▼
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Is the drinking water safe in Okanogan? ▼
What environmental agencies cover Okanogan? ▼
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.