How hard is the water in Santa Fe Springs, CA?

Tap water hardness
61mg/L
3.6gpg
Moderately hard

Reported by San Gabriel Valley Water CO.-El Monte · July 2025

CA typical
121 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Santa Fe Springs carries roughly 61 mg/L of dissolved calcium and magnesium, or 3.6 grains per gallon. That is moderately hard water. The number comes from San Gabriel Valley Water CO.-El Monte, dated July 2025.

Santa Fe Springs on the hardness scale, with nearby cities
060120180240300360+CA typical 121Pico Rivera: 45 mg/LPico Rivera 45West Whittier-Los Nietos: 75 mg/LWest Whittier-Los Nietos 75Bellflower: 119 mg/LBellflower 119Artesia: 126 mg/LArtesia 126Cerritos: 135 mg/LCerritos 135Norwalk: 136 mg/LNorwalk 136South Whittier: 174 mg/LSouth Whittier 174La Mirada: 174 mg/LLa Mirada 174East Whittier: 174 mg/LEast Whittier 174Downey: 247 mg/LDowney 247Santa Fe Springs 61mg/L as calcium carbonate060120180240300360+CA 121Pico Rivera: 45 mg/LPico Rivera 45West Whittier-Los Nietos: 75 mg/LWest Whitt. 75Norwalk: 136 mg/LNorwalk 136South Whittier: 174 mg/LSouth Whit. 174La Mirada: 174 mg/LLa Mirada 174Downey: 247 mg/LDowney 24761 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Santa Fe Springs sits 60 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 1 has softer water and 9 have harder. The range nearby runs from 45 mg/L in Pico Rivera to 247 in Downey.

What 61 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Santa Fe Springs

3 people × 75 gallons a day × 3.6 gpg = 801 grains a day. A 24,000-grain unit regenerates about every 29 days.

Size it for your household

EPA record for Santa Fe Springs's water system

GSWC - Culver City · PWSID CA1910030

No health-based violations since 2016

Serves about 38,233 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists GSWC - Culver City as the system serving Santa Fe Springs. The hardness figure above comes from a different system's report, which TapWaterData uses for Santa Fe Springs.

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 Santa Fe Springs water hard?

Somewhat. It measures about 61 mg/L (3.6 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Santa Fe Springs in grains per gallon?

About 3.6 gpg. One grain per gallon equals 17.1 mg/L, so 61 mg/L divided by 17.1 gives 3.6.

What size water softener do I need in Santa Fe Springs?

For 3 people using 75 gallons each per day, 3.6 gpg works out to about 801 grains a day. A 24,000-grain softener covers that with a regeneration about every 29 days.

Has the Santa Fe Springs water system had EPA violations?

EPA records show no health-based violations for GSWC - Culver City since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, July 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.