Mayfair, CA water hardness

Tap water hardness
10mg/L
0.6gpg
Soft

Calculated from the utility's calcium and magnesium results · September 2025

CA typical
121 mg/L
Data
Calculated from utility data

The water in Mayfair carries roughly 10 mg/L of dissolved calcium and magnesium, or 0.6 grains per gallon. That is soft water. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (September 2025).

Mayfair on the hardness scale, with nearby cities
060120180240300360+CA typical 121Clovis: 59 mg/LClovis 59Madera Acres: 62 mg/LMadera Acres 62Kingsburg: 91 mg/LKingsburg 91Dinuba: 92 mg/LDinuba 92Madera: 94 mg/LMadera 94Sunnyside: 167 mg/LSunnyside 167Orosi: 170 mg/LOrosi 170Sanger: 202 mg/LSanger 202Selma: 202 mg/LSelma 202Reedley: 202 mg/LReedley 202Mayfair 10mg/L as calcium carbonate060120180240300360+CA 121Clovis: 59 mg/LClovis 59Kingsburg: 91 mg/LKingsburg 91Sunnyside: 167 mg/LSunnyside 167Sanger: 202 mg/LSanger 202Selma: 202 mg/LSelma 202Reedley: 202 mg/LReedley 20210 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Mayfair sits 111 mg/L below the typical California figure of 121. None of the 10 nearest cities we track has softer water. The range nearby runs from 59 mg/L in Clovis to 202 in Sanger.

What 10 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 10 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Mayfair's water system

We could not match Mayfair to a community water system in EPA's records. Your water bill or the yearly Consumer Confidence Report names the system and its ID.

Questions

Is Mayfair water hard?

No. It measures about 10 mg/L (0.6 grains per gallon), which the USGS classes as soft.

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

About 0.6 gpg. One grain per gallon equals 17.1 mg/L, so 10 mg/L divided by 17.1 gives 0.6.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (calculated from utility data, September 21, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.