How hard is the water in Mentone, CA?

Tap water hardness
111mg/L
6.5gpg
Moderately hardReports range 78–111

Reported by San Bernardino Valley WD · August 2025

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

Mentone water measures 111 mg/L (6.5 gpg) of hardness, moderately hard by USGS standards. The number comes from San Bernardino Valley WD, dated August 2025. Reports for this system disagree, with values from 78 to 111 mg/L.

Mentone on the hardness scale, with nearby cities
060120180240300360+CA typical 121Running Springs: 36 mg/LRunning Springs 36San Bernardino: 79 mg/LSan Bernardino 79Loma Linda: 99 mg/LLoma Linda 99Highgrove: 99 mg/LHighgrove 99Yucaipa: 108 mg/LYucaipa 108Redlands: 111 mg/LRedlands 111Moreno Valley: 122 mg/LMoreno Valley 122Highland: 123 mg/LHighland 123Grand Terrace: 137 mg/LGrand Terrace 137Colton: 139 mg/LColton 139Mentone 111mg/L as calcium carbonate060120180240300360+CA 121Running Springs: 36 mg/LRunning Sp. 36Loma Linda: 99 mg/LLoma Linda 99Yucaipa: 108 mg/LYucaipa 108Redlands: 111 mg/LRedlands 111Moreno Valley: 122 mg/LMoreno Val. 122Highland: 123 mg/LHighland 123111 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 111 mg/L, Mentone is close to the typical California figure of 121 mg/L. Of the 10 nearest cities we track, 5 have softer water and 4 have harder. The range nearby runs from 36 mg/L in Running Springs to 139 in Colton.

What 111 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 Mentone

3 people × 75 gallons a day × 6.5 gpg = 1,460 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Mentone's water system

San Bernardino Valley WD · PWSID CA3610019

No health-based violations since 2016

Serves about 109,608 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Mentone to this system. EPA's service-area records do not name Mentone, so check the utility printed on your water bill.

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 Mentone water hard?

Somewhat. It measures about 111 mg/L (6.5 grains per gallon), which the USGS classes as moderately hard.

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

About 6.5 gpg. One grain per gallon equals 17.1 mg/L, so 111 mg/L divided by 17.1 gives 6.5.

What size water softener do I need in Mentone?

For 3 people using 75 gallons each per day, 6.5 gpg works out to about 1,460 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Mentone water system had EPA violations?

EPA records show no health-based violations for San Bernardino Valley WD since 2016.

Nearby cities

All 515 cities in California

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