Public water system
Tud - Upper Basin Water System
PWSID CA5510012 - Tuolumne County, California
9 PPM
0.5 GPG
Soft0Soft60120180300+
Soft (9 PPM)Verified - State Lab Tested
System Details
- Water source
- surface water
- Population served
- 13,280
- Service connections
- 4,991
- Status
- Active
Hardness Evidence
- Reported hardness
- 9 PPM
- Grains per gallon
- 0.5 GPG
- Data source
- California treated-water report
- Source year
- 2025
- Raw/source estimate
- 81 PPM
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 95305 | Big Oak Flat, CA | Soft (12 PPM) |
| 95310 | Columbia, CA | Soft (13 PPM) |
| 95321 | Groveland, CA | Soft (11 PPM) |
| 95327 | Jamestown, CA | Soft (23 PPM) |
| 95329 | La Grange, CA | Soft (20 PPM) |
| 95335 | Cold Springs, CA | Soft (12 PPM) |
| 95346 | Mi Wuk Village, CA | Soft (20 PPM) |
| 95364 | Pinecrest, CA | Soft (14 PPM) |
| 95370 | Sonora, CA | Soft (19 PPM) |
| 95372 | Soulsbyville, CA | Soft (13 PPM) |
| 95379 | Tuolumne, CA | Soft (13 PPM) |
| 95383 | Twain Harte, CA | Soft (21 PPM) |
How to Use This System Page
A public water system can serve multiple ZIP codes and cities. Use this page to inspect the source behind the hardness reading, then open the linked ZIP or city page for the local rollup.
If you are sizing treatment equipment, confirm your actual tap hardness with a home test or lab test before buying.