Public water system
U.S. Coast Guard Training Center
PWSID CA4910701 - Sonoma County, California
110 PPM
6.4 GPG
Slightly Hard0Soft60120180300+
Slightly Hard (110 PPM)Verified - State Lab Tested
System Details
- Water source
- groundwater
- Population served
- 469
- Service connections
- 217
- Status
- Active
Hardness Evidence
- Reported hardness
- 110 PPM
- Grains per gallon
- 6.4 GPG
- Data source
- California treated-water report
- Source year
- 2023
- Raw/source estimate
- 158 PPM
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 94952 | Petaluma, CA | Moderately Hard (126 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.