Hard water in Camarillo, CA
Reported by United WTR Cons Dist · October 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Camarillo carries roughly 218 mg/L of dissolved calcium and magnesium, or 12.7 grains per gallon. That is very hard water. The number comes from United WTR Cons Dist, dated October 2025. Reports for this system disagree, with values from 218 to 516 mg/L.
Camarillo sits 97 mg/L above the typical California figure of 121. Of the 10 nearest cities we track, 5 have softer water and 5 have harder. The range nearby runs from 77 mg/L in Fillmore to 400 in Ventura.
What 218 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 218 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 × 12.7 gpg = 2,862 grains a day. A 24,000-grain unit regenerates about every 8 days.
EPA record for Camarillo's water system
No health-based violations since 2016
Serves about 47,701 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 0
- Open now
- 0
EPA lists Camarillo Water Dept as the system serving Camarillo. The hardness figure above comes from a different system's report, which TapWaterData uses for Camarillo.
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 Camarillo water hard?
Yes. It measures about 218 mg/L (12.7 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Camarillo in grains per gallon?
About 12.7 gpg. One grain per gallon equals 17.1 mg/L, so 218 mg/L divided by 17.1 gives 12.7.
What size water softener do I need in Camarillo?
For 3 people using 75 gallons each per day, 12.7 gpg works out to about 2,862 grains a day. A 24,000-grain softener covers that with a regeneration about every 8 days.
Has the Camarillo water system had EPA violations?
EPA records show no health-based violations for Camarillo Water Dept since 2016.
Nearby cities
- El Rio278 mg/LVery hard
- Thousand Oaks117 mg/LModerately hard
- Santa Paula383 mg/LVery hard
- Moorpark190 mg/LVery hard
- Oxnard278 mg/LVery hard
- Port Hueneme278 mg/LVery hard
- Ventura400 mg/LVery hard
- Westlake Village88 mg/LModerately hard
- Fillmore77 mg/LModerately hard
- Oak Park138 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, October 14, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.