Hard water in Tehachapi, CA

Tap water hardness
363mg/L
21.2gpg
Very hard

Reported by A.f.p. Mutual Water Company · March 2023

CA typical
121 mg/L
EPA health violations since 2016
0
Softener for 3 people
48k grain
Data
Utility report

Tap water in Tehachapi has about 363 mg/L of hardness, which is 21.2 grains per gallon. On the USGS scale that counts as very hard. The number comes from A.f.p. Mutual Water Company, dated March 2023.

Tehachapi on the hardness scale, with nearby cities
060120180240300360+CA typical 121Potomac Park: 37 mg/LPotomac Park 37Hillcrest: 37 mg/LHillcrest 37East Bakersfield: 37 mg/LEast Bakersfield 37La Cresta: 37 mg/LLa Cresta 37Benton Park: 37 mg/LBenton Park 37California City: 73 mg/LCalifornia City 73Lancaster: 80 mg/LLancaster 80Rosamond: 103 mg/LRosamond 103Bear Valley Springs: 158 mg/LBear Valley Springs 158Quartz Hill: 226 mg/LQuartz Hill 226Tehachapi 363off the scalemg/L as calcium carbonate060120180240300360+CA 121Potomac Park: 37 mg/LPotomac Pa. 37Hillcrest: 37 mg/LHillcrest 37East Bakersfield: 37 mg/LEast Baker. 37California City: 73 mg/LCalifornia. 73Rosamond: 103 mg/LRosamond 103Bear Valley Springs: 158 mg/LBear Valle. 158363 mg/Loff the scalemg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Tehachapi sits 242 mg/L above the typical California figure of 121. None of the 10 nearest cities we track has harder water. The range nearby runs from 37 mg/L in Potomac Park to 226 in Quartz Hill.

What 363 mg/L means at home

Scale forms fast here. Kettles and coffee makers need regular descaling, and showerheads clog unless you clean them.

Tank water heaters collect mineral sediment that insulates the water from the burner, so flushing the tank matters more than usual.

Dishes and glass shower doors spot easily. Soap scum and a dull film on hair or laundry are common complaints.

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 363 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.

Softener size for Tehachapi

3 people × 75 gallons a day × 21.2 gpg = 4,777 grains a day. A 48,000-grain unit regenerates about every 10 days.

Size it for your household

EPA record for Tehachapi's water system

A.f.p. Mutual Water Company · PWSID CA1500466

No health-based violations since 2016

Serves about 710 people from groundwater.

Health-based
0
Monitoring or reporting
0
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 Tehachapi water hard?

Yes. It measures about 363 mg/L (21.2 grains per gallon), which the USGS classes as very hard.

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

About 21.2 gpg. One grain per gallon equals 17.1 mg/L, so 363 mg/L divided by 17.1 gives 21.2.

What size water softener do I need in Tehachapi?

For 3 people using 75 gallons each per day, 21.2 gpg works out to about 4,777 grains a day. A 48,000-grain softener covers that with a regeneration about every 10 days.

Has the Tehachapi water system had EPA violations?

EPA records show no health-based violations for A.f.p. Mutual Water Company since 2016.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (utility report, March 7, 2023), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.