How hard is the water in Tumwater, WA?

Tap water hardness
60mg/L
3.5gpg
Moderately hard

Reported by Tumwater City of · March 2025

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

Tap water in Tumwater has about 60 mg/L of hardness, which is 3.5 grains per gallon. On the USGS scale that counts as moderately hard. The number comes from Tumwater City of, dated March 2025.

Tumwater on the hardness scale, with nearby cities
060120180240300360+WA typical 36University Place: 22 mg/LUniversity Place 22Parkland: 22 mg/LParkland 22Fircrest: 22 mg/LFircrest 22Spanaway: 39 mg/LSpanaway 39Wollochet: 46 mg/LWollochet 46Olympia: 52 mg/LOlympia 52Steilacoom: 72 mg/LSteilacoom 72Lakewood: 72 mg/LLakewood 72Tanglewilde: 83 mg/LTanglewilde 83Lacey: 110 mg/LLacey 110Tumwater 60mg/L as calcium carbonate060120180240300360+WA 36University Place: 22 mg/LUniversity. 22Olympia: 52 mg/LOlympia 52Steilacoom: 72 mg/LSteilacoom 72Lakewood: 72 mg/LLakewood 72Tanglewilde: 83 mg/LTanglewilde 83Lacey: 110 mg/LLacey 11060 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 60 mg/L, Tumwater is 24 mg/L above the typical Washington figure of 36. Of the 10 nearest cities we track, 6 have softer water and 4 have harder. The range nearby runs from 22 mg/L in University Place to 110 in Lacey.

What 60 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 Tumwater

3 people × 75 gallons a day × 3.5 gpg = 792 grains a day. A 24,000-grain unit regenerates about every 30 days.

Size it for your household

EPA record for Tumwater's water system

Tumwater City of · PWSID WA5389700

No health-based violations since 2016

Serves about 51,924 people from groundwater.

Health-based
0
Monitoring or reporting
1
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 Tumwater water hard?

Somewhat. It measures about 60 mg/L (3.5 grains per gallon), which the USGS classes as moderately hard.

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

About 3.5 gpg. One grain per gallon equals 17.1 mg/L, so 60 mg/L divided by 17.1 gives 3.5.

What size water softener do I need in Tumwater?

For 3 people using 75 gallons each per day, 3.5 gpg works out to about 792 grains a day. A 24,000-grain softener covers that with a regeneration about every 30 days.

Has the Tumwater water system had EPA violations?

EPA records show no health-based violations for Tumwater City of since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, March 20, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.