Grass Valley, CA water hardness

Tap water hardness
13mg/L
0.7gpg
Soft

Reported by Nevada ID - E. George, Banner Mountain · June 2025

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

Grass Valley water measures 13 mg/L (0.7 gpg) of hardness, soft by USGS standards. The number comes from Nevada ID - E. George, Banner Mountain, dated June 2025.

Grass Valley on the hardness scale, with nearby cities
060120180240300360+CA typical 121Auburn: 11 mg/LAuburn 11Loomis: 11 mg/LLoomis 11Rocklin: 11 mg/LRocklin 11North Auburn: 12 mg/LNorth Auburn 12Granite Bay: 13 mg/LGranite Bay 13Lincoln: 15 mg/LLincoln 15Alta Sierra: 16 mg/LAlta Sierra 16Marysville: 98 mg/LMarysville 98Plumas Lake: 197 mg/LPlumas Lake 197Yuba City: 247 mg/LYuba City 247Grass Valley 13mg/L as calcium carbonate060120180240300360+CA 121Auburn: 11 mg/LAuburn 11Loomis: 11 mg/LLoomis 11North Auburn: 12 mg/LNorth Aubu. 12Lincoln: 15 mg/LLincoln 15Alta Sierra: 16 mg/LAlta Sierra 16Marysville: 98 mg/LMarysville 9813 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Grass Valley sits 108 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 4 have softer water and 5 have harder. The range nearby runs from 11 mg/L in Auburn to 247 in Yuba City.

What 13 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 13 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 Grass Valley's water system

Nevada ID - E. George, Banner Mountain · PWSID CA2910004

No health-based violations since 2016

Serves about 17,154 people from surface water.

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 Grass Valley water hard?

No. It measures about 13 mg/L (0.7 grains per gallon), which the USGS classes as soft.

What is the water hardness in Grass Valley in grains per gallon?

About 0.7 gpg. One grain per gallon equals 17.1 mg/L, so 13 mg/L divided by 17.1 gives 0.7.

Has the Grass Valley water system had EPA violations?

EPA records show no health-based violations for Nevada ID - E. George, Banner Mountain since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, June 4, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.