Hard water in Yuba City, CA
County estimate from 65 water samples in Sutter County · July 2026
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Yuba City put hardness at about 247 mg/L (14.4 gpg), which would be very hard on the USGS scale. Treat this as a rough guide: it is the median of 65 samples taken across Sutter County, mostly wells and streams, not a test of Yuba City's treated tap water. One more reason for caution: EPA lists Yuba City's water system as using surface water, which is often softer than the wells behind the county figure.
Yuba City sits 126 mg/L above the typical California figure of 121. None of the 10 nearest cities we track has harder water. The range nearby runs from 11 mg/L in Rocklin to 197 in Plumas Lake.
What 247 mg/L means at home
Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.
Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.
Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.
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
At 247 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 14.4 gpg = 3,249 grains a day. A 24,000-grain unit regenerates about every 7 days.
EPA record for Yuba City's water system
No health-based violations since 2016
Serves about 70,256 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
EPA lists this system as serving Yuba City.
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 Yuba City water hard?
Yes. It measures about 247 mg/L (14.4 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Yuba City in grains per gallon?
About 14.4 gpg. One grain per gallon equals 17.1 mg/L, so 247 mg/L divided by 17.1 gives 14.4.
What size water softener do I need in Yuba City?
For 3 people using 75 gallons each per day, 14.4 gpg works out to about 3,249 grains a day. A 24,000-grain softener covers that with a regeneration about every 7 days.
Has the Yuba City water system had EPA violations?
EPA records show no health-based violations for City of Yuba City since 2016.
Nearby cities
- Marysville98 mg/LModerately hard
- Plumas Lake197 mg/LVery hard
- Colusa33 mg/LSoft
- Oroville24 mg/LSoft
- Lincoln15 mg/LSoft
- Roseville19 mg/LSoft
- Rocklin11 mg/LSoft
- Alta Sierra16 mg/LSoft
- Grass Valley13 mg/LSoft
- Woodland44 mg/LSoft
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.