Atascadero, CA water hardness

Tap water hardness
39mg/L
2.3gpg
Soft

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

CA typical
121 mg/L
Data
Calculated from utility data

Tap water in Atascadero has about 39 mg/L of hardness, which is 2.3 grains per gallon. On the USGS scale that counts as soft. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (July 2025).

Atascadero on the hardness scale, with nearby cities
060120180240300360+CA typical 121Lemoore Station: 100 mg/LLemoore Station 100Coalinga: 118 mg/LCoalinga 118Morro Bay: 149 mg/LMorro Bay 149Pismo Beach: 149 mg/LPismo Beach 149San Luis Obispo: 216 mg/LSan Luis Obispo 216Santa Maria: 217 mg/LSanta Maria 217Greenfield: 227 mg/LGreenfield 227Soledad: 227 mg/LSoledad 227Orcutt: 233 mg/LOrcutt 233Nipomo: 604 mg/LNipomo 604Atascadero 39mg/L as calcium carbonate060120180240300360+CA 121Morro Bay: 149 mg/LMorro Bay 149Pismo Beach: 149 mg/LPismo Beach 149San Luis Obispo: 216 mg/LSan Luis O. 216Santa Maria: 217 mg/LSanta Maria 217Orcutt: 233 mg/LOrcutt 233Nipomo: 604 mg/LNipomo 60439 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

At 39 mg/L, Atascadero is 82 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 100 mg/L in Lemoore Station to 604 in Nipomo.

What 39 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 39 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 Atascadero's water system

We could not match Atascadero 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 Atascadero water hard?

No. It measures about 39 mg/L (2.3 grains per gallon), which the USGS classes as soft.

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

About 2.3 gpg. One grain per gallon equals 17.1 mg/L, so 39 mg/L divided by 17.1 gives 2.3.

Nearby cities

All 515 cities in California

Hardness data: TapWaterData US Water Hardness (calculated from utility data, July 22, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.