# California Water Systems by My Home Water System

> Published drinking water hardness for California cities, with links to each city's site. Not a water utility.

## Cities
- [Los Angeles](https://losangeleswatersystems.com/): Average 103 mg/L, range 96-117 mg/L (LADWP, Calendar year 2025)
- [Riverside](https://riversidehomewatersystems.com/): Average 197 mg/L (12 grains per gallon), range 180-210 mg/L (Riverside Public Utilities, Calendar year 2025)
- [San Diego](https://sandiegowatersystems.com/): Average 237 ppm (13.8 grains per gallon), range 203-270 ppm (City of San Diego Public Utilities, Calendar year 2025)
- [San Francisco](https://sanfranciscowatersystems.com/): Average 62 ppm, range 8.1-112 ppm (SFPUC, Calendar year 2025)

- [All cities](https://www.myhomewatersystem.com/hard-water-by-city/)