How hard is the water in Minnehaha, WA?

Tap water hardness
105mg/L
6.1gpg
Moderately hard

Reported by Vancouver City of · July 2025

WA typical
36 mg/L
EPA health violations since 2016
0
Softener for 3 people
24k grain
Data
Utility report

The water in Minnehaha carries roughly 105 mg/L of dissolved calcium and magnesium, or 6.1 grains per gallon. That is moderately hard water. The number comes from Vancouver City of, dated July 2025.

Minnehaha on the hardness scale, with nearby cities
060120180240300360+WA typical 36Barberton: 86 mg/LBarberton 86Lake Shore: 86 mg/LLake Shore 86Salmon Creek: 86 mg/LSalmon Creek 86Mount Vista: 86 mg/LMount Vista 86Felida: 86 mg/LFelida 86Vancouver: 100 mg/LVancouver 100Hazel Dell: 101 mg/LHazel Dell 101Five Corners: 101 mg/LFive Corners 101Orchards: 101 mg/LOrchards 101Hockinson: 101 mg/LHockinson 101Minnehaha 105mg/L as calcium carbonate060120180240300360+WA 36Barberton: 86 mg/LBarberton 86Lake Shore: 86 mg/LLake Shore 86Salmon Creek: 86 mg/LSalmon Cre. 86Vancouver: 100 mg/LVancouver 100Hazel Dell: 101 mg/LHazel Dell 101Five Corners: 101 mg/LFive Corne. 101105 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Minnehaha sits 69 mg/L above the typical Washington figure of 36. None of the 10 nearest cities we track has harder water. The range nearby runs from 86 mg/L in Barberton to 101 in Hazel Dell.

What 105 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 Minnehaha

3 people × 75 gallons a day × 6.1 gpg = 1,381 grains a day. A 24,000-grain unit regenerates about every 17 days.

Size it for your household

EPA record for Minnehaha's water system

Vancouver City of · PWSID WA5391200

No health-based violations since 2016

Serves about 373,047 people from groundwater.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Minnehaha to this system. EPA's service-area records do not name Minnehaha, so check the utility printed on your water bill.

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 Minnehaha water hard?

Somewhat. It measures about 105 mg/L (6.1 grains per gallon), which the USGS classes as moderately hard.

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

About 6.1 gpg. One grain per gallon equals 17.1 mg/L, so 105 mg/L divided by 17.1 gives 6.1.

What size water softener do I need in Minnehaha?

For 3 people using 75 gallons each per day, 6.1 gpg works out to about 1,381 grains a day. A 24,000-grain softener covers that with a regeneration about every 17 days.

Has the Minnehaha water system had EPA violations?

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

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, July 7, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.