El Sobrante, CA water hardness

Tap water hardness
48mg/L
2.8gpg
SoftReports range 16–48

Reported by East Bay MUD · October 2025

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

El Sobrante water measures 48 mg/L (2.8 gpg) of hardness, soft by USGS standards. The number comes from East Bay MUD, dated October 2025. Reports for this system disagree, with values from 16 to 48 mg/L.

El Sobrante on the hardness scale, with nearby cities
060120180240300360+CA typical 121Pinole: 34 mg/LPinole 34San Pablo: 34 mg/LSan Pablo 34Hercules: 34 mg/LHercules 34Richmond: 34 mg/LRichmond 34Kensington: 34 mg/LKensington 34Rodeo: 34 mg/LRodeo 34Albany: 34 mg/LAlbany 34Berkeley: 34 mg/LBerkeley 34Emeryville: 34 mg/LEmeryville 34El Cerrito: 51 mg/LEl Cerrito 51El Sobrante 48mg/L as calcium carbonate060120180240300360+CA 121Pinole: 34 mg/LPinole 34San Pablo: 34 mg/LSan Pablo 34Hercules: 34 mg/LHercules 34Richmond: 34 mg/LRichmond 34Kensington: 34 mg/LKensington 34El Cerrito: 51 mg/LEl Cerrito 5148 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 48 mg/L, El Sobrante is 73 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 34 mg/L in Pinole to 51 in El Cerrito.

What 48 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 48 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 El Sobrante's water system

East Bay MUD · PWSID CA0110005

No health-based violations since 2016

Serves about 1,468,000 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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

No. It measures about 48 mg/L (2.8 grains per gallon), which the USGS classes as soft.

What is the water hardness in El Sobrante in grains per gallon?

About 2.8 gpg. One grain per gallon equals 17.1 mg/L, so 48 mg/L divided by 17.1 gives 2.8.

Has the El Sobrante water system had EPA violations?

EPA records show no health-based violations for East Bay MUD since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, October 13, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.