Public water system
City Of Fairfield
PWSID CA4810003 - Solano County, California
185 PPM
10.8 GPG
Hard0Soft60120180300+
Hard (185 PPM)Verified - State Lab Tested
System Details
- Water source
- surface water
- Population served
- 120,377
- Service connections
- 32,910
- Status
- Active
Hardness Evidence
- Reported hardness
- 185 PPM
- Grains per gallon
- 10.8 GPG
- Data source
- California treated-water report
- Source year
- 2024
- Raw/source estimate
- 244 PPM
Linked City Reports
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 94510 | Benicia, CA | Moderately Hard (169 PPM) |
| 94512 | Birds Landing, CA | Moderately Hard (169 PPM) |
| 94533 | Fairfield, CA | Moderately Hard (169 PPM) |
| 94535 | Travis Afb, CA | Moderately Hard (169 PPM) |
| 94571 | Rio Vista, CA | Moderately Hard (169 PPM) |
| 94585 | Suisun City, CA | Moderately Hard (169 PPM) |
| 94589 | American Canyon, CA | Moderately Hard (165 PPM) |
| 94590 | Vallejo, CA | Moderately Hard (169 PPM) |
| 94591 | Vallejo, CA | Moderately Hard (169 PPM) |
| 94592 | Mare Island, CA | Moderately Hard (169 PPM) |
| 95620 | Liberty Farms, CA | Moderately Hard (169 PPM) |
| 95625 | Elmira, CA | Moderately Hard (169 PPM) |
| 95687 | Vacaville, CA | Moderately Hard (169 PPM) |
| 95688 | Vacaville, CA | Moderately Hard (169 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.