How hard is the water in Hesperia, CA?

Tap water hardness
108mg/L
6.3gpg
Moderately hard

Reported by Hesperia WD · January 2024

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

The water in Hesperia carries roughly 108 mg/L of dissolved calcium and magnesium, or 6.3 grains per gallon. That is moderately hard water. The number comes from Hesperia WD, dated January 2024.

Hesperia on the hardness scale, with nearby cities
060120180240300360+CA typical 121Running Springs: 36 mg/LRunning Springs 36Crestline: 51 mg/LCrestline 51Lake Arrowhead: 56 mg/LLake Arrowhead 56Muscoy: 72 mg/LMuscoy 72San Bernardino: 79 mg/LSan Bernardino 79Rialto: 89 mg/LRialto 89Fontana: 92 mg/LFontana 92Adelanto: 111 mg/LAdelanto 111Highland: 123 mg/LHighland 123Apple Valley: 205 mg/LApple Valley 205Hesperia 108mg/L as calcium carbonate060120180240300360+CA 121Running Springs: 36 mg/LRunning Sp. 36Crestline: 51 mg/LCrestline 51Lake Arrowhead: 56 mg/LLake Arrow. 56Muscoy: 72 mg/LMuscoy 72Adelanto: 111 mg/LAdelanto 111Apple Valley: 205 mg/LApple Vall. 205108 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 108 mg/L, Hesperia is 13 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 36 mg/L in Running Springs to 205 in Apple Valley.

What 108 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 Hesperia

3 people × 75 gallons a day × 6.3 gpg = 1,422 grains a day. A 24,000-grain unit regenerates about every 16 days.

Size it for your household

EPA record for Hesperia's water system

Hesperia WD · PWSID CA3610024

No health-based violations since 2016

Serves about 101,836 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

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 Hesperia water hard?

Somewhat. It measures about 108 mg/L (6.3 grains per gallon), which the USGS classes as moderately hard.

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

About 6.3 gpg. One grain per gallon equals 17.1 mg/L, so 108 mg/L divided by 17.1 gives 6.3.

What size water softener do I need in Hesperia?

For 3 people using 75 gallons each per day, 6.3 gpg works out to about 1,422 grains a day. A 24,000-grain softener covers that with a regeneration about every 16 days.

Has the Hesperia water system had EPA violations?

EPA records show no health-based violations for Hesperia WD since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, January 22, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.