Diamond Springs, CA water hardness

Tap water hardness
14mg/L
0.8gpg
Soft

Reported by El Dorado ID - Main · September 2025

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

Tap water in Diamond Springs has about 14 mg/L of hardness, which is 0.8 grains per gallon. On the USGS scale that counts as soft. The number comes from El Dorado ID - Main, dated September 2025.

Diamond Springs on the hardness scale, with nearby cities
060120180240300360+CA typical 121Auburn: 11 mg/LAuburn 11Loomis: 11 mg/LLoomis 11North Auburn: 12 mg/LNorth Auburn 12Granite Bay: 13 mg/LGranite Bay 13Placerville: 14 mg/LPlacerville 14Cameron Park: 14 mg/LCameron Park 14El Dorado Hills: 14 mg/LEl Dorado Hills 14Folsom: 18 mg/LFolsom 18Orangevale: 45 mg/LOrangevale 45Fair Oaks: 53 mg/LFair Oaks 53Diamond Springs 14mg/L as calcium carbonate060120180240300360+CA 121Auburn: 11 mg/LAuburn 11Granite Bay: 13 mg/LGranite Bay 13Placerville: 14 mg/LPlacerville 14Cameron Park: 14 mg/LCameron Pa. 14El Dorado Hills: 14 mg/LEl Dorado. 14Folsom: 18 mg/LFolsom 1814 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 14 mg/L, Diamond Springs is 107 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 4 have softer water and 3 have harder. The range nearby runs from 11 mg/L in Auburn to 53 in Fair Oaks.

What 14 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 14 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 Diamond Springs's water system

El Dorado ID - Main · PWSID CA0910001

No health-based violations since 2016

Serves about 128,408 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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

No. It measures about 14 mg/L (0.8 grains per gallon), which the USGS classes as soft.

What is the water hardness in Diamond Springs in grains per gallon?

About 0.8 gpg. One grain per gallon equals 17.1 mg/L, so 14 mg/L divided by 17.1 gives 0.8.

Has the Diamond Springs water system had EPA violations?

EPA records show no health-based violations for El Dorado ID - Main since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, September 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.