How hard is the water in Bloomington, CA?

Tap water hardness
96mg/L
5.6gpg
Moderately hardReports range 61–150

Reported by San Gabriel Valley WC - Fontana · August 2025

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

Bloomington water measures 96 mg/L (5.6 gpg) of hardness, moderately hard by USGS standards. The number comes from San Gabriel Valley WC - Fontana, dated August 2025. Reports for this system disagree, with values from 61 to 150 mg/L.

Bloomington on the hardness scale, with nearby cities
060120180240300360+CA typical 121Muscoy: 72 mg/LMuscoy 72San Bernardino: 79 mg/LSan Bernardino 79Rialto: 89 mg/LRialto 89Fontana: 92 mg/LFontana 92Highgrove: 99 mg/LHighgrove 99Loma Linda: 99 mg/LLoma Linda 99Riverside: 112 mg/LRiverside 112Jurupa Valley: 122 mg/LJurupa Valley 122Grand Terrace: 137 mg/LGrand Terrace 137Colton: 139 mg/LColton 139Bloomington 96mg/L as calcium carbonate060120180240300360+CA 121Rialto: 89 mg/LRialto 89Fontana: 92 mg/LFontana 92Highgrove: 99 mg/LHighgrove 99Jurupa Valley: 122 mg/LJurupa Val. 122Grand Terrace: 137 mg/LGrand Terr. 137Colton: 139 mg/LColton 13996 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Bloomington sits 25 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 72 mg/L in Muscoy to 139 in Colton.

What 96 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 Bloomington

3 people × 75 gallons a day × 5.6 gpg = 1,262 grains a day. A 24,000-grain unit regenerates about every 19 days.

Size it for your household

EPA record for Bloomington's water system

San Gabriel Valley WC - Fontana · PWSID CA3610041

No health-based violations since 2016

Serves about 228,270 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Bloomington to this system. EPA's service-area records do not name Bloomington, 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 Bloomington water hard?

Somewhat. It measures about 96 mg/L (5.6 grains per gallon), which the USGS classes as moderately hard.

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

About 5.6 gpg. One grain per gallon equals 17.1 mg/L, so 96 mg/L divided by 17.1 gives 5.6.

What size water softener do I need in Bloomington?

For 3 people using 75 gallons each per day, 5.6 gpg works out to about 1,262 grains a day. A 24,000-grain softener covers that with a regeneration about every 19 days.

Has the Bloomington water system had EPA violations?

EPA records show no health-based violations for San Gabriel Valley WC - Fontana 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.