Spanaway, WA water hardness

Tap water hardness
39mg/L
2.3gpg
SoftCounty estimate

County estimate from 237 water samples in Pierce County · July 2026

WA typical
36 mg/L
EPA health violations since 2016
0
Data
County estimate

Water samples from around Spanaway put hardness at about 39 mg/L (2.3 gpg), which would be soft on the USGS scale. Treat this as a rough guide: it is the median of 237 samples taken across Pierce County, mostly wells and streams, not a test of Spanaway's treated tap water.

Spanaway on the hardness scale, with nearby cities
060120180240300360+WA typical 36Frederickson: 22 mg/LFrederickson 22Parkland: 22 mg/LParkland 22Clover Creek: 22 mg/LClover Creek 22Summit View: 22 mg/LSummit View 22Midland: 22 mg/LMidland 22Summit: 22 mg/LSummit 22South Hill: 22 mg/LSouth Hill 22Waller: 22 mg/LWaller 22Graham: 22 mg/LGraham 22Lakewood: 72 mg/LLakewood 72Spanaway 39mg/L as calcium carbonate060120180240300360+WA 36Frederickson: 22 mg/LFredericks. 22Parkland: 22 mg/LParkland 22Clover Creek: 22 mg/LClover Cre. 22Summit View: 22 mg/LSummit View 22Midland: 22 mg/LMidland 22Summit: 22 mg/LSummit 2239 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, Spanaway is close to the typical Washington figure of 36 mg/L. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 22 mg/L in Frederickson to 72 in Lakewood.

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 Spanaway's water system

Spanaway Water Company · PWSID WA5382850

No health-based violations since 2016

Serves about 34,506 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists this system as serving Spanaway.

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 Spanaway 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 Spanaway 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.

Has the Spanaway water system had EPA violations?

EPA records show no health-based violations for Spanaway Water Company since 2016.

Nearby cities

All 145 cities in Washington

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.