How hard is the water in Toppenish, WA?

Tap water hardness
63mg/L
3.7gpg
Moderately hard

Calculated from the utility's calcium and magnesium results · August 2022

WA typical
36 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Calculated from utility data

Toppenish water measures 63 mg/L (3.7 gpg) of hardness, moderately hard by USGS standards. TapWaterData worked it out from the calcium and magnesium levels the local utility reports (August 2022).

Toppenish on the hardness scale, with nearby cities
060120180240300360+WA typical 36Union Gap: 31 mg/LUnion Gap 31West Richland: 33 mg/LWest Richland 33Yakima: 39 mg/LYakima 39Ellensburg: 60 mg/LEllensburg 60Terrace Heights: 88 mg/LTerrace Heights 88Richland: 89 mg/LRichland 89Kennewick: 96 mg/LKennewick 96Selah: 147 mg/LSelah 147Grandview: 208 mg/LGrandview 208Pasco: 268 mg/LPasco 268Toppenish 63mg/L as calcium carbonate060120180240300360+WA 36Union Gap: 31 mg/LUnion Gap 31Yakima: 39 mg/LYakima 39Ellensburg: 60 mg/LEllensburg 60Terrace Heights: 88 mg/LTerrace He. 88Selah: 147 mg/LSelah 147Grandview: 208 mg/LGrandview 20863 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Toppenish sits 27 mg/L above the typical Washington figure of 36. Of the 10 nearest cities we track, 4 have softer water and 6 have harder. The range nearby runs from 31 mg/L in Union Gap to 268 in Pasco.

What 63 mg/L means at home

You may see faint white spots on glasses and shower doors after the water dries.

Scale builds up slowly. A kettle or coffee maker needs descaling now and then, maybe every few months.

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

Optional. Plenty of households at this level live with it and descale the kettle now and then.

Water softener

Worth a look if spots on glass bother you, or if your tankless water heater manual asks for softer water.

Carbon filter

Improves taste and removes chlorine. It leaves calcium and magnesium in place.

Softener size for Toppenish

3 people × 75 gallons a day × 3.7 gpg = 826 grains a day. A 24,000-grain unit regenerates about every 29 days.

Size it for your household

EPA record for Toppenish's water system

Toppenish Water Department · PWSID WA5388850

No health-based violations since 2016

Serves about 13,382 people from groundwater.

Health-based
0
Monitoring or reporting
2
Open now
0

EPA lists this system as serving Toppenish.

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 Toppenish water hard?

Somewhat. It measures about 63 mg/L (3.7 grains per gallon), which the USGS classes as moderately hard.

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

About 3.7 gpg. One grain per gallon equals 17.1 mg/L, so 63 mg/L divided by 17.1 gives 3.7.

What size water softener do I need in Toppenish?

For 3 people using 75 gallons each per day, 3.7 gpg works out to about 826 grains a day. A 24,000-grain softener covers that with a regeneration about every 29 days.

Has the Toppenish water system had EPA violations?

EPA records show no health-based violations for Toppenish Water Department since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (calculated from utility data, August 22, 2022), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.