How hard is the water in San Jacinto, CA?

Tap water hardness
120mg/L
7.0gpg
Moderately hard

Reported by Eastern Municipal WD · September 2025

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

The water in San Jacinto carries roughly 120 mg/L of dissolved calcium and magnesium, or 7.0 grains per gallon. That is moderately hard water. The number comes from Eastern Municipal WD, dated September 2025.

San Jacinto on the hardness scale, with nearby cities
060120180240300360+CA typical 121Hemet: 120 mg/LHemet 120East Hemet: 120 mg/LEast Hemet 120Valle Vista: 120 mg/LValle Vista 120Homeland: 120 mg/LHomeland 120Nuevo: 120 mg/LNuevo 120Perris: 120 mg/LPerris 120Menifee: 120 mg/LMenifee 120Moreno Valley: 122 mg/LMoreno Valley 122Beaumont: 123 mg/LBeaumont 123Banning: 186 mg/LBanning 186San Jacinto 120mg/L as calcium carbonate060120180240300360+CA 121Hemet: 120 mg/LHemet 120East Hemet: 120 mg/LEast Hemet 120Valle Vista: 120 mg/LValle Vista 120Homeland: 120 mg/LHomeland 120Nuevo: 120 mg/LNuevo 120Beaumont: 123 mg/LBeaumont 123120 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

San Jacinto sits close to the typical California figure of 121 mg/L. None of the 10 nearest cities we track has softer water. The range nearby runs from 120 mg/L in Hemet to 186 in Banning.

What 120 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 San Jacinto

3 people × 75 gallons a day × 7.0 gpg = 1,580 grains a day. A 24,000-grain unit regenerates about every 15 days.

Size it for your household

EPA record for San Jacinto's water system

San Jacinto, City of · PWSID CA3310032

No health-based violations since 2016

Serves about 20,938 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

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

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 San Jacinto water hard?

Somewhat. It measures about 120 mg/L (7.0 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in San Jacinto in grains per gallon?

About 7.0 gpg. One grain per gallon equals 17.1 mg/L, so 120 mg/L divided by 17.1 gives 7.0.

What size water softener do I need in San Jacinto?

For 3 people using 75 gallons each per day, 7.0 gpg works out to about 1,580 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.

Has the San Jacinto water system had EPA violations?

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

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, September 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.