How hard is the water in West Carson, CA?
Reported by Los Angeles-City, Dept. of Water & Power · October 2025
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 2
- Softener for 3 people
- 24k grain
- Data
- Utility report
West Carson water measures 119 mg/L (6.9 gpg) of hardness, moderately hard by USGS standards. The number comes from Los Angeles-City, Dept. of Water & Power, dated October 2025. Reports for this system disagree, with values from 94 to 119 mg/L.
At 119 mg/L, West Carson is close to the typical California figure of 121 mg/L. None of the 10 nearest cities we track has softer water. The range nearby runs from 121 mg/L in Lomita to 198 in Redondo Beach.
What 119 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.
3 people × 75 gallons a day × 6.9 gpg = 1,562 grains a day. A 24,000-grain unit regenerates about every 15 days.
EPA record for West Carson's water system
2 health-based violations since 2016
Serves about 3,875,566 people from surface water.
- Health-based
- 2
- Monitoring or reporting
- 2
- Open now
- 0
TapWaterData ties West Carson to this system. EPA's service-area records do not name West Carson, so check the utility printed on your water bill.
| Contaminant or rule | Violations | Period | Status |
|---|---|---|---|
| Surface Water Treatment Rule (LT2)filtration and disinfection | 1 | 2018 | Resolved |
| Groundwater Ruletreatment of well water | 1 | 2016 | Resolved |
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 West Carson water hard?
Somewhat. It measures about 119 mg/L (6.9 grains per gallon), which the USGS classes as moderately hard.
What is the water hardness in West Carson in grains per gallon?
About 6.9 gpg. One grain per gallon equals 17.1 mg/L, so 119 mg/L divided by 17.1 gives 6.9.
What size water softener do I need in West Carson?
For 3 people using 75 gallons each per day, 6.9 gpg works out to about 1,562 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.
Has the West Carson water system had EPA violations?
EPA records show 2 health-based violations for Los Angeles-City, Dept. of Water & Power since 2016, involving Surface Water Treatment Rule (LT2), Groundwater Rule. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.
Nearby cities
- Lomita121 mg/LHard
- Gardena185 mg/LVery hard
- Alondra Park185 mg/LVery hard
- Lawndale188 mg/LVery hard
- West Rancho Dominguez185 mg/LVery hard
- Redondo Beach198 mg/LVery hard
- West Athens185 mg/LVery hard
- Hawthorne189 mg/LVery hard
- Hermosa Beach198 mg/LVery hard
- Rancho Palos Verdes171 mg/LHard
Hardness data: TapWaterData US Water Hardness (utility report, October 6, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.