Mill Creek, WA water hardness

Tap water hardness
13mg/L
0.7gpg
Soft

Reported by Alderwood Water District · September 2025

WA typical
36 mg/L
EPA health violations since 2016
0
Data
Utility report

Mill Creek water measures 13 mg/L (0.7 gpg) of hardness, soft by USGS standards. The number comes from Alderwood Water District, dated September 2025.

Mill Creek on the hardness scale, with nearby cities
060120180240300360+WA typical 36Martha Lake: 13 mg/LMartha Lake 13Lake Stickney: 13 mg/LLake Stickney 13Mill Creek East: 13 mg/LMill Creek East 13North Lynnwood: 13 mg/LNorth Lynnwood 13Bothell East: 13 mg/LBothell East 13Bothell West: 13 mg/LBothell West 13Alderwood Manor: 13 mg/LAlderwood Manor 13Picnic Point: 13 mg/LPicnic Point 13Eastmont: 22 mg/LEastmont 22Silver Firs: 43 mg/LSilver Firs 43Mill Creek 13mg/L as calcium carbonate060120180240300360+WA 36Martha Lake: 13 mg/LMartha Lake 13Lake Stickney: 13 mg/LLake Stick. 13Mill Creek East: 13 mg/LMill Creek. 13North Lynnwood: 13 mg/LNorth Lynn. 13Eastmont: 22 mg/LEastmont 22Silver Firs: 43 mg/LSilver Firs 4313 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 13 mg/L, Mill Creek is 23 mg/L below the typical Washington figure of 36. None of the 10 nearest cities we track has softer water. The range nearby runs from 13 mg/L in Martha Lake to 43 in Silver Firs.

What 13 mg/L means at home

Soap and shampoo lather with very little product. Kettles and showerheads stay mostly free of white crust.

Some people notice that soap feels slow to rinse off in soft water. That slippery feel is normal and harmless.

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

Nothing, as far as hardness goes. At 13 mg/L a softener would have almost nothing to remove.

Carbon filter

If the water tastes of chlorine, a pitcher or faucet carbon filter takes care of that. It does not change hardness.

EPA record for Mill Creek's water system

Alderwood Water District · PWSID WA5301300

No health-based violations since 2016

Serves about 245,715 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

TapWaterData ties Mill Creek to this system. EPA's service-area records do not name Mill Creek, 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 Mill Creek water hard?

No. It measures about 13 mg/L (0.7 grains per gallon), which the USGS classes as soft.

What is the water hardness in Mill Creek in grains per gallon?

About 0.7 gpg. One grain per gallon equals 17.1 mg/L, so 13 mg/L divided by 17.1 gives 0.7.

Has the Mill Creek water system had EPA violations?

EPA records show no health-based violations for Alderwood Water District since 2016.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, September 3, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.