Rocklin, CA water hardness

Tap water hardness
11mg/L
0.7gpg
Soft

Reported by Placer Cwa - Foothill · June 2025

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

Rocklin water measures 11 mg/L (0.7 gpg) of hardness, soft by USGS standards. The number comes from Placer Cwa - Foothill, dated June 2025.

Rocklin on the hardness scale, with nearby cities
060120180240300360+CA typical 121Loomis: 11 mg/LLoomis 11Auburn: 11 mg/LAuburn 11Granite Bay: 13 mg/LGranite Bay 13Lincoln: 15 mg/LLincoln 15Roseville: 19 mg/LRoseville 19Orangevale: 45 mg/LOrangevale 45Fair Oaks: 53 mg/LFair Oaks 53Citrus Heights: 82 mg/LCitrus Heights 82Antelope: 90 mg/LAntelope 90Foothill Farms: 92 mg/LFoothill Farms 92Rocklin 11mg/L as calcium carbonate060120180240300360+CA 121Loomis: 11 mg/LLoomis 11Granite Bay: 13 mg/LGranite Bay 13Lincoln: 15 mg/LLincoln 15Roseville: 19 mg/LRoseville 19Orangevale: 45 mg/LOrangevale 45Citrus Heights: 82 mg/LCitrus Hei. 8211 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 11 mg/L, Rocklin is 110 mg/L below the typical California figure of 121. None of the 10 nearest cities we track has softer water. The range nearby runs from 11 mg/L in Loomis to 92 in Foothill Farms.

What 11 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 11 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 Rocklin's water system

Placer Cwa - Foothill · PWSID CA3110025

No health-based violations since 2016

Serves about 93,417 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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

No. It measures about 11 mg/L (0.7 grains per gallon), which the USGS classes as soft.

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

About 0.7 gpg. One grain per gallon equals 17.1 mg/L, so 11 mg/L divided by 17.1 gives 0.7.

Has the Rocklin water system had EPA violations?

EPA records show no health-based violations for Placer Cwa - Foothill since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, June 29, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.