How hard is the water in Enumclaw, WA?

Tap water hardness
62mg/L
3.6gpg
Moderately hard

Reported by Enumclaw Water Department · February 2025

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

The water in Enumclaw carries roughly 62 mg/L of dissolved calcium and magnesium, or 3.6 grains per gallon. That is moderately hard water. The number comes from Enumclaw Water Department, dated February 2025.

Enumclaw on the hardness scale, with nearby cities
060120180240300360+WA typical 36Tehaleh: 22 mg/LTehaleh 22Orting: 22 mg/LOrting 22Prairie Ridge: 30 mg/LPrairie Ridge 30Bonney Lake: 30 mg/LBonney Lake 30Black Diamond: 46 mg/LBlack Diamond 46Maple Valley: 46 mg/LMaple Valley 46Lake Morton-Berrydale: 52 mg/LLake Morton-Berrydale 52Auburn: 58 mg/LAuburn 58Covington: 59 mg/LCovington 59Lake Tapps: 95 mg/LLake Tapps 95Enumclaw 62mg/L as calcium carbonate060120180240300360+WA 36Tehaleh: 22 mg/LTehaleh 22Prairie Ridge: 30 mg/LPrairie Ri. 30Bonney Lake: 30 mg/LBonney Lake 30Black Diamond: 46 mg/LBlack Diam. 46Lake Morton-Berrydale: 52 mg/LLake Morto. 52Lake Tapps: 95 mg/LLake Tapps 9562 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 62 mg/L, Enumclaw is 26 mg/L above the typical Washington figure of 36. Of the 10 nearest cities we track, 9 have softer water and 1 has harder. The range nearby runs from 22 mg/L in Tehaleh to 95 in Lake Tapps.

What 62 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 Enumclaw

3 people × 75 gallons a day × 3.6 gpg = 810 grains a day. A 24,000-grain unit regenerates about every 29 days.

Size it for your household

EPA record for Enumclaw's water system

Enumclaw Water Department · PWSID WA5323600

No health-based violations since 2016

Serves about 23,276 people from groundwater.

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 Enumclaw water hard?

Somewhat. It measures about 62 mg/L (3.6 grains per gallon), which the USGS classes as moderately hard.

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

About 3.6 gpg. One grain per gallon equals 17.1 mg/L, so 62 mg/L divided by 17.1 gives 3.6.

What size water softener do I need in Enumclaw?

For 3 people using 75 gallons each per day, 3.6 gpg works out to about 810 grains a day. A 24,000-grain softener covers that with a regeneration about every 29 days.

Has the Enumclaw water system had EPA violations?

EPA records show no health-based violations for Enumclaw Water Department since 2016.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, February 1, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.