Idaho Water Quality Report
4 cities ranked · Average grade: B+ · Idaho
Avg Score
84
Cities Ranked
4
Health Violations
4
PFAS Detected
2
84
County avg score
4
Cities ranked
100%
A or B grade
0%
D or F grade
4
Health violations
2
PFAS detected
Grade Distribution
How Idaho cities scored
A
2
50%
Excellent
B
2
50%
Good
C
0
0%
Fair
D
0
0%
Poor
F
0
0%
Failing
Comparison
County vs Idaho average
▲ 15.8 pts above state average
City Map
Water quality across Idaho
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Idaho
Best cities
Worst cities
County context
13.4%
of residents on fluoridated water (CDC, 2020)
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Idaho
Industrial polluters nearby
Facilities reporting the most surface-water releases in Idaho, 2023.
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
IDAHO FOREST GROUP GRANGEVILLE FACILITY GRANGEVILLE, ID83530 | — | — |
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 4 cities in Idaho
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Kooskia | A | 94.5 | 607 | 9 | Health Unresolved | |
| 2 | Riggins | A- | 88.9 | 554 | 62 | Health Unresolved | |
| 3 | Cottonwood | B+ | 82.2 | 2K | 102 | Health Unresolved | |
| 4 | Grangeville | B- | 70.5 | 3K | 100 | Health Unresolved |