Public water system
California Water Service - Stockton
PWSID CA3910001 - San Joaquin County, California
67 PPM
3.9 GPG
Slightly Hard0Soft60120180300+
Slightly Hard (67 PPM)Verified - State Lab Tested
System Details
- Water source
- surface water
- Population served
- 176,266
- Service connections
- 44,359
- Status
- Active
Hardness Evidence
- Reported hardness
- 67 PPM
- Grains per gallon
- 3.9 GPG
- Data source
- California treated-water report
- Source year
- 2024
- Raw/source estimate
- 192 PPM
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 95112 | San Jose, CA | Hard (188 PPM) |
| 95202 | Stockton, CA | Slightly Hard (111 PPM) |
| 95203 | Stockton, CA | Slightly Hard (111 PPM) |
| 95204 | Stockton, CA | Slightly Hard (111 PPM) |
| 95205 | Stockton, CA | Slightly Hard (112 PPM) |
| 95206 | Stockton, CA | Slightly Hard (111 PPM) |
| 95207 | Stockton, CA | Slightly Hard (111 PPM) |
| 95209 | Stockton, CA | Slightly Hard (111 PPM) |
| 95210 | Stockton, CA | Slightly Hard (111 PPM) |
| 95212 | Stockton, CA | Slightly Hard (111 PPM) |
| 95215 | Stockton, CA | Slightly Hard (111 PPM) |
| 95219 | Stockton, CA | Slightly Hard (112 PPM) |
| 95220 | Acampo, CA | Slightly Hard (111 PPM) |
| 95227 | Clements, CA | Slightly Hard (111 PPM) |
| 95230 | Farmington, CA | Slightly Hard (111 PPM) |
| 95231 | French Camp, CA | Slightly Hard (111 PPM) |
| 95236 | Linden, CA | Slightly Hard (111 PPM) |
| 95237 | Lockeford, CA | Slightly Hard (111 PPM) |
| 95240 | Lodi, CA | Slightly Hard (111 PPM) |
| 95242 | Lodi, CA | Slightly Hard (111 PPM) |
| 95258 | Woodbridge, CA | Slightly Hard (111 PPM) |
| 95320 | Escalon, CA | Slightly Hard (112 PPM) |
| 95330 | Lathrop, CA | Slightly Hard (111 PPM) |
| 95336 | Manteca, CA | Slightly Hard (111 PPM) |
| 95337 | Manteca, CA | Slightly Hard (111 PPM) |
| 95366 | Ripon, CA | Slightly Hard (111 PPM) |
| 95376 | Tracy, CA | Slightly Hard (111 PPM) |
| 95686 | Thornton, CA | Slightly Hard (111 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.