How hard is the water in Orange, CA?

Tap water hardness

117mg/L

6.9gpg

Moderately hard

Reported by Irvine Ranch Water District · October 2025

CA typical: 121 mg/L
EPA health violations since 2016: 0
Softener for 3 people: 24k grain
Data: Utility report

Orange water measures 117 mg/L (6.9 gpg) of hardness, moderately hard by USGS standards. The number comes from Irvine Ranch Water District, dated October 2025.

Orange on the hardness scale, with nearby cities

Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Orange sits close to the typical California figure of 121 mg/L. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 48 mg/L in Yorba Linda to 283 in Garden Grove.

What 117 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Orange

3 people × 75 gallons a day × 6.9 gpg = 1,544 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for Orange's water system

City of Orange · PWSID CA3010027

No health-based violations since 2016

Serves about 120,770 people from surface water.

Health-based: 0
Monitoring or reporting: 1
Open now: 0

EPA lists City of Orange as the system serving Orange. The hardness figure above comes from a different system's report, which TapWaterData uses for Orange.

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 Orange water hard?

Somewhat. It measures about 117 mg/L (6.9 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Orange in grains per gallon?

About 6.9 gpg. One grain per gallon equals 17.1 mg/L, so 117 mg/L divided by 17.1 gives 6.9.

What size water softener do I need in Orange?

For 3 people using 75 gallons each per day, 6.9 gpg works out to about 1,544 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the Orange water system had EPA violations?

EPA records show no health-based violations for City of Orange since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, October 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.