How hard is the water in Lancaster, CA?

Tap water hardness
80mg/L
4.7gpg
Moderately hardReports range 57–119

Reported by Sundale Mutual Water Company A, B · September 2025

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

Tap water in Lancaster has about 80 mg/L of hardness, which is 4.7 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Sundale Mutual Water Company A, B, dated September 2025. Reports for this system disagree, with values from 57 to 119 mg/L.

Lancaster on the hardness scale, with nearby cities
060120180240300360+CA typical 121La Crescenta-Montrose: 3 mg/LLa Crescenta-Montrose 3Palmdale: 62 mg/LPalmdale 62Rosamond: 103 mg/LRosamond 103San Fernando: 121 mg/LSan Fernando 121La Cañada Flintridge: 218 mg/LLa Cañada Flintridge 218Quartz Hill: 226 mg/LQuartz Hill 226Altadena: 234 mg/LAltadena 234Castaic: 236 mg/LCastaic 236Stevenson Ranch: 236 mg/LStevenson Ranch 236Tehachapi: 363 mg/LTehachapi 363Lancaster 80mg/L as calcium carbonate060120180240300360+CA 121Palmdale: 62 mg/LPalmdale 62Rosamond: 103 mg/LRosamond 103San Fernando: 121 mg/LSan Fernan. 121Quartz Hill: 226 mg/LQuartz Hill 226Castaic: 236 mg/LCastaic 236Stevenson Ranch: 236 mg/LStevenson. 23680 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Lancaster sits 41 mg/L below the typical California figure of 121. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 3 mg/L in La Crescenta-Montrose to 363 in Tehachapi.

What 80 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 Lancaster

3 people × 75 gallons a day × 4.7 gpg = 1,055 grains a day. A 24,000-grain unit regenerates about every 22 days.

Size it for your household

EPA record for Lancaster's water system

Sundale Mutual Water Company A, B · PWSID CA1900563

No health-based violations since 2016

Serves about 1,155 people from groundwater.

Health-based
0
Monitoring or reporting
2
Open now
0

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 Lancaster water hard?

Somewhat. It measures about 80 mg/L (4.7 grains per gallon), which the USGS classes as moderately hard.

What is the water hardness in Lancaster in grains per gallon?

About 4.7 gpg. One grain per gallon equals 17.1 mg/L, so 80 mg/L divided by 17.1 gives 4.7.

What size water softener do I need in Lancaster?

For 3 people using 75 gallons each per day, 4.7 gpg works out to about 1,055 grains a day. A 24,000-grain softener covers that with a regeneration about every 22 days.

Has the Lancaster water system had EPA violations?

EPA records show no health-based violations for Sundale Mutual Water Company A, B since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, September 30, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.