Ukiah, CA water hardness
Reported by Ukiah, City of · September 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Data
- Utility report
Ukiah water measures 55 mg/L (3.2 gpg) of hardness, soft by USGS standards. The number comes from Ukiah, City of, dated September 2025. Reports for this system disagree, with values from 27 to 67 mg/L.
At 55 mg/L, Ukiah is 66 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 33 mg/L in Colusa to 356 in Orland.
What 55 mg/L means at home
Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.
Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
Nothing, as far as hardness goes. At 55 mg/L a softener would have almost nothing to remove.
Carbon filter
If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.
EPA record for Ukiah's water system
No health-based violations since 2016
Serves about 16,067 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 1
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Ukiah water hard?
No. It measures about 55 mg/L (3.2 grains per gallon), which the USGS classes as soft.
What is the water hardness in Ukiah in grains per gallon?
About 3.2 gpg. One grain per gallon equals 17.1 mg/L, so 55 mg/L divided by 17.1 gives 3.2.
Has the Ukiah water system had EPA violations?
EPA records show no health-based violations for Ukiah, City of since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Clearlake96 mg/LModerately hard
- Healdsburg93 mg/LModerately hard
- Windsor120 mg/LModerately hard
- Santa Rosa121 mg/LHard
- Sebastopol142 mg/LHard
- Rohnert Park106 mg/LModerately hard
- Cotati106 mg/LModerately hard
- Colusa33 mg/LSoft
- Orland356 mg/LVery hard
- Boyes Hot Springs62 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, September 2, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.