How hard is the water in Loma Linda, CA?

Tap water hardness
99mg/L
5.8gpg
Moderately hardReports range 60–99

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

Loma Linda water measures 99 mg/L (5.8 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 60 to 99 mg/L.

Loma Linda on the hardness scale, with nearby cities
060120180240300360+CA typical 121San Bernardino: 79 mg/LSan Bernardino 79Rialto: 89 mg/LRialto 89Bloomington: 96 mg/LBloomington 96Highgrove: 99 mg/LHighgrove 99Redlands: 111 mg/LRedlands 111Mentone: 111 mg/LMentone 111Moreno Valley: 122 mg/LMoreno Valley 122Highland: 123 mg/LHighland 123Grand Terrace: 137 mg/LGrand Terrace 137Colton: 139 mg/LColton 139Loma Linda 99mg/L as calcium carbonate060120180240300360+CA 121San Bernardino: 79 mg/LSan Bernar. 79Highgrove: 99 mg/LHighgrove 99Redlands: 111 mg/LRedlands 111Highland: 123 mg/LHighland 123Grand Terrace: 137 mg/LGrand Terr. 137Colton: 139 mg/LColton 13999 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Loma Linda sits 22 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 6 have harder. The range nearby runs from 79 mg/L in San Bernardino to 139 in Colton.

What 99 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 Loma Linda

3 people × 75 gallons a day × 5.8 gpg = 1,298 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for Loma Linda's water system

Loma Linda, City of · PWSID CA3610013

No health-based violations since 2016

Serves about 25,208 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

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

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 Loma Linda water hard?

Somewhat. It measures about 99 mg/L (5.8 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Loma Linda in grains per gallon?

About 5.8 gpg. One grain per gallon equals 17.1 mg/L, so 99 mg/L divided by 17.1 gives 5.8.

What size water softener do I need in Loma Linda?

For 3 people using 75 gallons each per day, 5.8 gpg works out to about 1,298 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the Loma Linda water system had EPA violations?

EPA records show no health-based violations for Loma Linda, City of 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, August 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.