Duvall, WA water hardness

Tap water hardness
21mg/L
1.2gpg
Soft

Reported by Duvall City of · December 2024

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

Duvall water measures 21 mg/L (1.2 gpg) of hardness, soft by USGS standards. The number comes from Duvall City of, dated December 2024.

Duvall on the hardness scale, with nearby cities
060120180240300360+WA typical 36Bothell East: 13 mg/LBothell East 13Maltby: 16 mg/LMaltby 16Bothell: 19 mg/LBothell 19Cottage Lake: 25 mg/LCottage Lake 25Woodinville: 25 mg/LWoodinville 25Monroe: 29 mg/LMonroe 29Kirkland: 34 mg/LKirkland 34Redmond: 39 mg/LRedmond 39Union Hill-Novelty Hill: 50 mg/LUnion Hill-Novelty Hill 50Sammamish: 62 mg/LSammamish 62Duvall 21mg/L as calcium carbonate060120180240300360+WA 36Maltby: 16 mg/LMaltby 16Cottage Lake: 25 mg/LCottage La. 25Woodinville: 25 mg/LWoodinville 25Monroe: 29 mg/LMonroe 29Redmond: 39 mg/LRedmond 39Union Hill-Novelty Hill: 50 mg/LUnion Hill. 5021 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Duvall sits 15 mg/L below the typical Washington figure of 36. Of the 10 nearest cities we track, 3 have softer water and 7 have harder. The range nearby runs from 13 mg/L in Bothell East to 62 in Sammamish.

What 21 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 21 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 Duvall's water system

Duvall City of · PWSID WA5320750

No health-based violations since 2016

Serves about 11,050 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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 Duvall water hard?

No. It measures about 21 mg/L (1.2 grains per gallon), which the USGS classes as soft.

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

About 1.2 gpg. One grain per gallon equals 17.1 mg/L, so 21 mg/L divided by 17.1 gives 1.2.

Has the Duvall water system had EPA violations?

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

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, December 16, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.