Rosemont, CA water hardness

Tap water hardness
38mg/L
2.2gpg
Soft

Reported by Cal Am - Suburban Rosemont · November 2023

CA typical
121 mg/L
EPA health violations since 2016
0
Data
Utility report

Tap water in Rosemont has about 38 mg/L of hardness, which is 2.2 grains per gallon. On the USGS scale that counts as soft. The number comes from Cal Am - Suburban Rosemont, dated November 2023.

Rosemont on the hardness scale, with nearby cities
060120180240300360+CA typical 121Fruitridge Pocket: 25 mg/LFruitridge Pocket 25Lemon Hill: 25 mg/LLemon Hill 25Rancho Cordova: 28 mg/LRancho Cordova 28Sacramento: 45 mg/LSacramento 45Vineyard: 53 mg/LVineyard 53Florin: 66 mg/LFlorin 66Parkway: 66 mg/LParkway 66Carmichael: 74 mg/LCarmichael 74La Riviera: 85 mg/LLa Riviera 85Arden-Arcade: 98 mg/LArden-Arcade 98Rosemont 38mg/L as calcium carbonate060120180240300360+CA 121Fruitridge Pocket: 25 mg/LFruitridge. 25Lemon Hill: 25 mg/LLemon Hill 25Vineyard: 53 mg/LVineyard 53Florin: 66 mg/LFlorin 66La Riviera: 85 mg/LLa Riviera 85Arden-Arcade: 98 mg/LArden-Arca. 9838 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 38 mg/L, Rosemont is 83 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 25 mg/L in Fruitridge Pocket to 98 in Arden-Arcade.

What 38 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 38 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Rosemont's water system

Cal Am - Suburban Rosemont · PWSID CA3410010

No health-based violations since 2016

Serves about 54,893 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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

No. It measures about 38 mg/L (2.2 grains per gallon), which the USGS classes as soft.

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

About 2.2 gpg. One grain per gallon equals 17.1 mg/L, so 38 mg/L divided by 17.1 gives 2.2.

Has the Rosemont water system had EPA violations?

EPA records show no health-based violations for Cal Am - Suburban Rosemont since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, November 17, 2023), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.