Kirkland, WA water hardness

Tap water hardness
34mg/L
2.0gpg
Soft

Reported by Redmond Water System City of · September 2025

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

Kirkland water measures 34 mg/L (2.0 gpg) of hardness, soft by USGS standards. The number comes from Redmond Water System City of, dated September 2025.

Kirkland on the hardness scale, with nearby cities
060120180240300360+WA typical 36Brier: 13 mg/LBrier 13Bothell East: 13 mg/LBothell East 13Bothell West: 13 mg/LBothell West 13Bothell: 19 mg/LBothell 19Kenmore: 25 mg/LKenmore 25Woodinville: 25 mg/LWoodinville 25Cottage Lake: 25 mg/LCottage Lake 25Lake Forest Park: 30 mg/LLake Forest Park 30Bellevue: 34 mg/LBellevue 34Redmond: 39 mg/LRedmond 39Kirkland 34mg/L as calcium carbonate060120180240300360+WA 36Bothell: 19 mg/LBothell 19Kenmore: 25 mg/LKenmore 25Woodinville: 25 mg/LWoodinville 25Cottage Lake: 25 mg/LCottage La. 25Lake Forest Park: 30 mg/LLake Fores. 30Redmond: 39 mg/LRedmond 3934 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 34 mg/L, Kirkland is close to the typical Washington figure of 36 mg/L. Of the 10 nearest cities we track, 8 have softer water and 1 has harder. The range nearby runs from 13 mg/L in Brier to 39 in Redmond.

What 34 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 34 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 Kirkland's water system

Kirkland City of · PWSID WA5342250

No health-based violations since 2016

Serves about 69,243 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

EPA lists Kirkland City of as the system serving Kirkland. The hardness figure above comes from a different system's report, which TapWaterData uses for Kirkland.

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 Kirkland water hard?

No. It measures about 34 mg/L (2.0 grains per gallon), which the USGS classes as soft.

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

About 2.0 gpg. One grain per gallon equals 17.1 mg/L, so 34 mg/L divided by 17.1 gives 2.0.

Has the Kirkland water system had EPA violations?

EPA records show no health-based violations for Kirkland City of since 2016.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, September 16, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.