How hard is the water in Hockinson, WA?

Tap water hardness
101mg/L
5.9gpg
Moderately hard

Reported by Vancouver City of · September 2025

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

Hockinson water measures 101 mg/L (5.9 gpg) of hardness, moderately hard by USGS standards. The number comes from Vancouver City of, dated September 2025.

Hockinson on the hardness scale, with nearby cities
060120180240300360+WA typical 36Battle Ground: 85 mg/LBattle Ground 85Barberton: 86 mg/LBarberton 86Mount Vista: 86 mg/LMount Vista 86Salmon Creek: 86 mg/LSalmon Creek 86Lake Shore: 86 mg/LLake Shore 86Vancouver: 100 mg/LVancouver 100Orchards: 101 mg/LOrchards 101Five Corners: 101 mg/LFive Corners 101Hazel Dell: 101 mg/LHazel Dell 101Minnehaha: 105 mg/LMinnehaha 105Hockinson 101mg/L as calcium carbonate060120180240300360+WA 36Battle Ground: 85 mg/LBattle Gro. 85Barberton: 86 mg/LBarberton 86Mount Vista: 86 mg/LMount Vista 86Orchards: 101 mg/LOrchards 101Five Corners: 101 mg/LFive Corne. 101Minnehaha: 105 mg/LMinnehaha 105101 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 101 mg/L, Hockinson is 65 mg/L above the typical Washington figure of 36. Of the 10 nearest cities we track, 6 have softer water and 1 has harder. The range nearby runs from 85 mg/L in Battle Ground to 105 in Minnehaha.

What 101 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 Hockinson

3 people × 75 gallons a day × 5.9 gpg = 1,323 grains a day. A 24,000-grain unit regenerates about every 18 days.

Size it for your household

EPA record for Hockinson'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 Hockinson to this system. EPA's service-area records do not name Hockinson, 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 Hockinson water hard?

Somewhat. It measures about 101 mg/L (5.9 grains per gallon), which the USGS classes as moderately hard.

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

About 5.9 gpg. One grain per gallon equals 17.1 mg/L, so 101 mg/L divided by 17.1 gives 5.9.

What size water softener do I need in Hockinson?

For 3 people using 75 gallons each per day, 5.9 gpg works out to about 1,323 grains a day. A 24,000-grain softener covers that with a regeneration about every 18 days.

Has the Hockinson 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, September 8, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.