Okanogan Water Quality Report
11 cities ranked · Average grade: B- · Washington
Avg Score
72.3
Cities Ranked
11
Health Violations
11
PFAS Detected
1
72.3
County avg score
11
Cities ranked
64%
A or B grade
36%
D or F grade
11
Health violations
1
PFAS detected
Grade Distribution
How Okanogan cities scored
A
4
36%
Excellent
B
3
27%
Good
C
0
0%
Fair
D
4
36%
Poor
F
0
0%
Failing
Comparison
County vs Washington average
▲ 2.2 pts above state average
City Map
Water quality across Okanogan
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Okanogan
Best cities
Worst cities
County context
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Okanogan
Industrial polluters nearby
Facilities reporting the most surface-water releases in Okanogan, 2023.
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
US CBP OROVILLE PORT OF ENTRY WA0021 OROVILLE, WA98844 | — | — |
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 11 cities in Okanogan
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Twisp | A | 93.5 | 1K | 42 | Health | |
| 2 | Coulee Dam | A | 90.7 | 1K | 3 | Health Unresolved | |
| 3 | Malott | A- | 87.4 | 636 | 14 | Health Unresolved | |
| 4 | Oroville | A- | 86.1 | 3K | 79 | Health Unresolved | |
| 5 | Pateros | B+ | 84.1 | 1K | 77 | Health Unresolved | |
| 6 | Okanogan | B+ | 83.5 | 4K | 183 | Health Unresolved | |
| 7 | Winthrop | B | 75.6 | 1K | 84 | Health Unresolved | |
| 8 | Nespelem | D+ | 50 | 2K | 1984 | Health Unresolved | |
| 9 | Omak | D | 48.9 | 5K | 172 | Health Unresolved | |
| 10 | Tonasket | D | 48 | 7K | 1524 | Health Unresolved | |
| 11 | Brewster | D | 48 | 5K | 408 | Health Unresolved |