Tuolumne Water Quality Report
9 cities ranked · Average grade: B- · California
Avg Score
74.3
Cities Ranked
9
Health Violations
8
PFAS Detected
2
74.3
County avg score
9
Cities ranked
67%
A or B grade
11%
D or F grade
8
Health violations
2
PFAS detected
Grade Distribution
How Tuolumne cities scored
A
2
22%
Excellent
B
4
44%
Good
C
2
22%
Fair
D
1
11%
Poor
F
0
0%
Failing
Comparison
County vs California average
▼ 2.2 pts below state average
City Map
Water quality across Tuolumne
Each dot is a city, colored by grade. Click any city to view its full report.
Highlights
Top & bottom cities in Tuolumne
County context
0
lbs/yr to surface water · top 10 TRI facilities
Industrial pollution
Top industrial polluters in Tuolumne
Industrial polluters nearby
Facilities reporting the most surface-water releases in Tuolumne, 2023.
| Facility | Top chemical | To surface water (lbs/yr) |
|---|---|---|
DV NATURAL RESOURCES--BRIGGS MINE TRONA, CA93592 | — | — |
Source: EPA Toxic Release Inventory (TRI) 2023
Full Rankings
All 9 cities in Tuolumne
| # | City | Grade | Score | Score | Population | Violations | Issues |
|---|---|---|---|---|---|---|---|
| 1 | Cold Springs | A- | 89.9 | 2K | 3 | Unresolved | |
| 2 | Claremont | A- | 89 | 2K | 73 | Health Unresolved | |
| 3 | Mi Wuk Village | B+ | 82.4 | 3K | 30 | Health Unresolved | |
| 4 | La Grange | B | 77.5 | 4K | 55 | Health Unresolved | |
| 5 | Groveland | B- | 71.5 | 3K | 14 | Health PFAS Unresolved | |
| 6 | Pinecrest | B- | 70 | 1K | 7 | Health Unresolved | |
| 7 | Jamestown | C+ | 69.3 | 4K | 54 | Health Unresolved | |
| 8 | Twain Harte | C+ | 66.2 | 4K | 55 | Health Unresolved | |
| 9 | Sonora | D+ | 53.3 | 38K | 110 | Health Unresolved |