Hard water in Lynwood, CA
County estimate from 979 water samples in Los Angeles County · July 2026
- CA typical
- 121 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- County estimate
Water samples from around Lynwood put hardness at about 171 mg/L (10.0 gpg), which would be hard on the USGS scale. Treat this as a rough guide: it is the median of 979 samples taken across Los Angeles County, mostly wells and streams, not a test of Lynwood's treated tap water. One more reason for caution: EPA lists Lynwood's water system as using surface water, which is often softer than the wells behind the county figure.
Lynwood sits 50 mg/L above 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 108 mg/L in Paramount to 247 in Downey.
What 171 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
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
At 171 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 10.0 gpg = 2,250 grains a day. A 24,000-grain unit regenerates about every 10 days.
EPA record for Lynwood's water system
No health-based violations since 2016
Serves about 66,967 people from surface water.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 0
EPA lists this system as serving Lynwood.
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 Lynwood water hard?
Yes. It measures about 171 mg/L (10.0 grains per gallon), which the USGS classes as hard.
What is the water hardness in Lynwood in grains per gallon?
About 10.0 gpg. One grain per gallon equals 17.1 mg/L, so 171 mg/L divided by 17.1 gives 10.0.
What size water softener do I need in Lynwood?
For 3 people using 75 gallons each per day, 10.0 gpg works out to about 2,250 grains a day. A 24,000-grain softener covers that with a regeneration about every 10 days.
Has the Lynwood water system had EPA violations?
EPA records show no health-based violations for Lynwood-City, Water Dept. since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- South Gate217 mg/LVery hard
- Willowbrook121 mg/LHard
- Paramount108 mg/LModerately hard
- Bell Gardens171 mg/LHard
- Florence-Graham121 mg/LHard
- Huntington Park171 mg/LHard
- West Rancho Dominguez185 mg/LVery hard
- Downey247 mg/LVery hard
- Maywood171 mg/LHard
- Bellflower119 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (county estimate, July 4, 2026), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.