Hard water in Anaheim, CA
Reported by City of Anaheim · October 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 32k grain
- Data
- Utility report
The water in Anaheim carries roughly 274 mg/L of dissolved calcium and magnesium, or 16.0 grains per gallon. That is very hard water. The number comes from City of Anaheim, dated October 2025. Reports for this system disagree, with values from 274 to 329 mg/L.
Anaheim sits 153 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 48 mg/L in Yorba Linda to 252 in Villa Park.
What 274 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 274 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 × 16.0 gpg = 3,600 grains a day. A 32,000-grain unit regenerates about every 8 days.
EPA record for Anaheim's water system
No health-based violations since 2016
Serves about 350,254 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 3
- Open now
- 0
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 Anaheim water hard?
Yes. It measures about 274 mg/L (16.0 grains per gallon), which the USGS classes as very hard.
What is the water hardness in Anaheim in grains per gallon?
About 16.0 gpg. One grain per gallon equals 17.1 mg/L, so 274 mg/L divided by 17.1 gives 16.0.
What size water softener do I need in Anaheim?
For 3 people using 75 gallons each per day, 16.0 gpg works out to about 3,600 grains a day. A 32,000-grain softener covers that with a regeneration about every 8 days.
Has the Anaheim water system had EPA violations?
EPA records show no health-based violations for City of Anaheim since 2016. There were also 3 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Yorba Linda48 mg/LSoft
- Villa Park252 mg/LVery hard
- Chino Hills81 mg/LModerately hard
- North Tustin243 mg/LVery hard
- Orange117 mg/LModerately hard
- Brea191 mg/LVery hard
- Fullerton175 mg/LHard
- Diamond Bar153 mg/LHard
- Santa Ana150 mg/LHard
- Rowland Heights160 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.