Summit, WA water hardness

Tap water hardness
22mg/L
1.3gpg
Soft

Reported by Tacoma Water Division City of · September 2025

WA typical
36 mg/L
EPA health violations since 2016
0
Data
Utility report

Tap water in Summit has about 22 mg/L of hardness, which is 1.3 grains per gallon. On the USGS scale that counts as soft. The number comes from Tacoma Water Division City of, dated September 2025.

Summit on the hardness scale, with nearby cities
060120180240300360+WA typical 36Clover Creek: 22 mg/LClover Creek 22Midland: 22 mg/LMidland 22Summit View: 22 mg/LSummit View 22Waller: 22 mg/LWaller 22Parkland: 22 mg/LParkland 22South Hill: 22 mg/LSouth Hill 22Frederickson: 22 mg/LFrederickson 22Puyallup: 29 mg/LPuyallup 29Milton: 38 mg/LMilton 38Spanaway: 39 mg/LSpanaway 39Summit 22mg/L as calcium carbonate060120180240300360+WA 36Clover Creek: 22 mg/LClover Cre. 22Midland: 22 mg/LMidland 22Summit View: 22 mg/LSummit View 22Waller: 22 mg/LWaller 22Parkland: 22 mg/LParkland 22Puyallup: 29 mg/LPuyallup 2922 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 22 mg/L, Summit is 14 mg/L below the typical Washington figure of 36. None of the 10 nearest cities we track has softer water. The range nearby runs from 22 mg/L in Clover Creek to 39 in Spanaway.

What 22 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 22 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 Summit's water system

Summit Water & Supply CO · PWSID WA5385050

No health-based violations since 2016

Serves about 19,125 people from groundwater.

Health-based
0
Monitoring or reporting
1
Open now
0

EPA lists Summit Water & Supply CO as the system serving Summit. The hardness figure above comes from a different system's report, which TapWaterData uses for Summit.

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 Summit water hard?

No. It measures about 22 mg/L (1.3 grains per gallon), which the USGS classes as soft.

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

About 1.3 gpg. One grain per gallon equals 17.1 mg/L, so 22 mg/L divided by 17.1 gives 1.3.

Has the Summit water system had EPA violations?

EPA records show no health-based violations for Summit Water & Supply CO since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 145 cities in Washington

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