Public water system
Marin Municipal Water District
PWSID CA2110002 - Marin County, California
64 PPM
3.7 GPG
Slightly Hard0Soft60120180300+
Slightly Hard (64 PPM)Verified - State Lab Tested
System Details
- Water source
- surface water
- Population served
- 186,895
- Service connections
- 60,868
- Status
- Active
Hardness Evidence
- Reported hardness
- 64 PPM
- Grains per gallon
- 3.7 GPG
- Data source
- California treated-water report
- Source year
- 2024
- Raw/source estimate
- 120 PPM
Linked City Reports
San Rafael, CACivic Center, CAKentfield, CABelvedere, CABolinas, CACorte Madera, CADillon Beach, CAFairfax, CAForest Knolls, CAInverness, CALagunitas, CALarkspur, CAMarshall, CAMill Valley, CANovato, CANicasio, CAOlema, CAPoint Reyes Stat, CASan Anselmo, CASan Geronimo, CASan Quentin, CASausalito, CAStinson Beach, CATomales, CAWoodacre, CA
Served ZIP Codes
| ZIP | Location | ZIP average |
|---|---|---|
| 94901 | San Rafael, CA | Slightly Hard (82 PPM) |
| 94903 | Civic Center, CA | Slightly Hard (82 PPM) |
| 94904 | Kentfield, CA | Slightly Hard (82 PPM) |
| 94920 | Belvedere, CA | Slightly Hard (82 PPM) |
| 94924 | Bolinas, CA | Slightly Hard (83 PPM) |
| 94925 | Corte Madera, CA | Slightly Hard (82 PPM) |
| 94929 | Dillon Beach, CA | Slightly Hard (82 PPM) |
| 94930 | Fairfax, CA | Slightly Hard (82 PPM) |
| 94933 | Forest Knolls, CA | Slightly Hard (82 PPM) |
| 94937 | Inverness, CA | Slightly Hard (83 PPM) |
| 94938 | Lagunitas, CA | Slightly Hard (82 PPM) |
| 94939 | Larkspur, CA | Slightly Hard (82 PPM) |
| 94940 | Marshall, CA | Slightly Hard (82 PPM) |
| 94941 | Mill Valley, CA | Slightly Hard (82 PPM) |
| 94945 | Novato, CA | Slightly Hard (82 PPM) |
| 94946 | Nicasio, CA | Slightly Hard (82 PPM) |
| 94947 | Novato, CA | Slightly Hard (82 PPM) |
| 94949 | Novato, CA | Slightly Hard (82 PPM) |
| 94950 | Olema, CA | Slightly Hard (82 PPM) |
| 94956 | Point Reyes Stat, CA | Slightly Hard (82 PPM) |
| 94960 | San Anselmo, CA | Slightly Hard (82 PPM) |
| 94963 | San Geronimo, CA | Slightly Hard (82 PPM) |
| 94964 | San Quentin, CA | Slightly Hard (82 PPM) |
| 94965 | Sausalito, CA | Slightly Hard (82 PPM) |
| 94970 | Stinson Beach, CA | Slightly Hard (82 PPM) |
| 94971 | Tomales, CA | Slightly Hard (82 PPM) |
| 94973 | Woodacre, CA | Slightly Hard (82 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.