Every Orange County city, with its published number
Pick your city to see the hardness its supplier reports and the softener size that implies. If your city is not listed, it only means we have not published its water data yet — the installer still covers it.
North County
City-run utilities pumping heavily from the Orange County Groundwater Basin. Consistently the hardest water in the county.
- AnaheimAnaheim Public Utilities19 gpg · Extremely hard
- BreaCity of Brea Water Division13.2 gpg · Very hard
- Buena ParkCity of Buena Park Water Department12 gpg · Very hard
- FullertonCity of Fullerton Water Division14 gpg · Very hard
- La HabraCity of La Habra Water Division16 gpg · Extremely hard
- OrangeCity of Orange Water Division17 gpg · Extremely hard
- PlacentiaGolden State Water Company11 gpg · Very hard
- Villa ParkSerrano Water District20.1 gpg · Extremely hard
- Yorba LindaYorba Linda Water District20 gpg · Extremely hard
West County
Coastal plain cities on their own water departments or on Golden State Water, with one genuine soft-water outlier.
- CypressGolden State Water Company13.8 gpg · Very hard
- Fountain ValleyCity of Fountain Valley Water Department13 gpg · Very hard
- Garden GroveCity of Garden Grove Water Services18 gpg · Extremely hard
- Huntington BeachCity of Huntington Beach Public Works10 gpg · Hard
- Los AlamitosGolden State Water Company13.8 gpg · Very hard
- Santa AnaCity of Santa Ana Public Works14.2 gpg · Very hard
- Seal BeachCity of Seal Beach Utilities Division3.9 gpg · Moderately hard
- StantonGolden State Water Company13.8 gpg · Very hard
- WestminsterCity of Westminster Water Division14.7 gpg · Very hard
Central & coastal
Independent districts and city utilities. The widest spread in the county sits here, from 7 grains to 22.
- Costa MesaMesa Water District6.6 gpg · Moderately hard
- IrvineIrvine Ranch Water District13.8 gpg · Very hard
- Laguna BeachLaguna Beach County Water District14 gpg · Very hard
- Lake ForestIrvine Ranch Water District / El Toro Water District13.8 gpg · Very hard
- Newport BeachCity of Newport Beach Utilities14 gpg · Very hard
- TustinCity of Tustin Water Services22 gpg · Extremely hard
South County
Regional districts running almost entirely on imported Metropolitan supply, which makes the water harder but far more consistent through the year.
- Aliso ViejoMoulton Niguel Water District16.5 gpg · Extremely hard
- Dana PointSouth Coast Water DistrictN/A
- Ladera RanchSanta Margarita Water District15 gpg · Extremely hard
- Laguna HillsMoulton Niguel Water District / El Toro Water District16.5 gpg · Extremely hard
- Laguna NiguelMoulton Niguel Water District16.5 gpg · Extremely hard
- Mission ViejoSanta Margarita Water District15 gpg · Extremely hard
- Rancho Santa MargaritaSanta Margarita Water District15 gpg · Extremely hard
- San ClementeCity of San ClementeN/A
- San Juan CapistranoSanta Margarita Water District (Improvement District 9)12.3 gpg · Very hard
Most of Orange County runs 11–20 grains per gallon, against a flow-weighted countywide average of 13.9. Orange County Water District, 2025 (opens in a new tab) Every city figure above is taken from that supplier’s own annual water quality report and cited on the city page.Crystal Clear Water LLC also covers Los Angeles County and Riverside County.
Book the free water test
A licensed installer tests your tap, checks the plumbing loop, sizes the system and quotes it. No charge, and no obligation at the end of it.
- We send your details to the installerCrystal Clear Water LLC, CSLB #872771.
- They call to arrange a timeUsually the same day, and they work around your schedule.
- They test, size, and quote on siteYou get the number for your tap, not your district’s average.