Lynnwood, WA water hardness

Tap water hardness
15mg/L
0.9gpg
Soft

Reported by Alderwood Water District · September 2025

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

Lynnwood water measures 15 mg/L (0.9 gpg) of hardness, soft by USGS standards. The number comes from Alderwood Water District, dated September 2025.

Lynnwood on the hardness scale, with nearby cities
060120180240300360+WA typical 36Alderwood Manor: 13 mg/LAlderwood Manor 13North Lynnwood: 13 mg/LNorth Lynnwood 13Brier: 13 mg/LBrier 13Bothell West: 13 mg/LBothell West 13Picnic Point: 13 mg/LPicnic Point 13Martha Lake: 13 mg/LMartha Lake 13Lake Stickney: 13 mg/LLake Stickney 13Mountlake Terrace: 14 mg/LMountlake Terrace 14Lake Forest Park: 30 mg/LLake Forest Park 30Edmonds: 35 mg/LEdmonds 35Lynnwood 15mg/L as calcium carbonate060120180240300360+WA 36Alderwood Manor: 13 mg/LAlderwood. 13North Lynnwood: 13 mg/LNorth Lynn. 13Brier: 13 mg/LBrier 13Bothell West: 13 mg/LBothell We. 13Mountlake Terrace: 14 mg/LMountlake. 14Edmonds: 35 mg/LEdmonds 3515 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Lynnwood sits 21 mg/L below the typical Washington figure of 36. Of the 10 nearest cities we track, 8 have softer water and 2 have harder. The range nearby runs from 13 mg/L in Alderwood Manor to 35 in Edmonds.

What 15 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 15 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 Lynnwood'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

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 Lynnwood water hard?

No. It measures about 15 mg/L (0.9 grains per gallon), which the USGS classes as soft.

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

About 0.9 gpg. One grain per gallon equals 17.1 mg/L, so 15 mg/L divided by 17.1 gives 0.9.

Has the Lynnwood 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.