How hard is the water in Corcoran, CA?

Tap water hardness
64mg/L
3.8gpg
Moderately hardCounty estimate

County estimate from 55 water samples in Kings 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 Corcoran put hardness at about 64 mg/L (3.8 gpg), which would be moderately hard on the USGS scale. Treat this as a rough guide: it is the median of 55 samples taken across Kings County, mostly wells and streams, not a test of Corcoran's treated tap water.

Corcoran on the hardness scale, with nearby cities
060120180240300360+CA typical 121Hanford: 11 mg/LHanford 11Lemoore: 26 mg/LLemoore 26Tulare: 37 mg/LTulare 37Visalia: 74 mg/LVisalia 74Kingsburg: 91 mg/LKingsburg 91Dinuba: 92 mg/LDinuba 92Lemoore Station: 100 mg/LLemoore Station 100Delano: 181 mg/LDelano 181Porterville: 233 mg/LPorterville 233Lindsay: 303 mg/LLindsay 303Corcoran 64mg/L as calcium carbonate060120180240300360+CA 121Hanford: 11 mg/LHanford 11Lemoore: 26 mg/LLemoore 26Tulare: 37 mg/LTulare 37Visalia: 74 mg/LVisalia 74Lemoore Station: 100 mg/LLemoore St. 100Lindsay: 303 mg/LLindsay 30364 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 64 mg/L, Corcoran is 57 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 11 mg/L in Hanford to 303 in Lindsay.

What 64 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 Corcoran

3 people × 75 gallons a day × 3.8 gpg = 846 grains a day. A 24,000-grain unit regenerates about every 28 days.

Size it for your household

EPA record for Corcoran's water system

Corcoran, City of · PWSID CA1610004

No health-based violations since 2016

Serves about 22,808 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists this system as serving Corcoran.

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 Corcoran water hard?

Somewhat. It measures about 64 mg/L (3.8 grains per gallon), which the USGS classes as moderately hard.

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

About 3.8 gpg. One grain per gallon equals 17.1 mg/L, so 64 mg/L divided by 17.1 gives 3.8.

What size water softener do I need in Corcoran?

For 3 people using 75 gallons each per day, 3.8 gpg works out to about 846 grains a day. A 24,000-grain softener covers that with a regeneration about every 28 days.

Has the Corcoran water system had EPA violations?

EPA records show no health-based violations for Corcoran, City of since 2016.

Nearby cities

All 515 cities in California

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.