Lake Forest Park, WA water hardness

Tap water hardness
30mg/L
1.8gpg
SoftReports range 30–53

Reported by Seattle Public Utilities · October 2025

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

Tap water in Lake Forest Park has about 30 mg/L of hardness, which is 1.8 grains per gallon. On the USGS scale that counts as soft. The number comes from Seattle Public Utilities, dated October 2025. Reports for this system disagree, with values from 30 to 53 mg/L.

Lake Forest Park on the hardness scale, with nearby cities
060120180240300360+WA typical 36Brier: 13 mg/LBrier 13Alderwood Manor: 13 mg/LAlderwood Manor 13Bothell West: 13 mg/LBothell West 13Mountlake Terrace: 14 mg/LMountlake Terrace 14Lynnwood: 15 mg/LLynnwood 15Bothell: 19 mg/LBothell 19Kenmore: 25 mg/LKenmore 25Shoreline: 31 mg/LShoreline 31Kirkland: 34 mg/LKirkland 34Edmonds: 35 mg/LEdmonds 35Lake Forest Park 30mg/L as calcium carbonate060120180240300360+WA 36Brier: 13 mg/LBrier 13Alderwood Manor: 13 mg/LAlderwood. 13Bothell West: 13 mg/LBothell We. 13Mountlake Terrace: 14 mg/LMountlake. 14Kenmore: 25 mg/LKenmore 25Shoreline: 31 mg/LShoreline 3130 mg/Lmg/L as calcium carbonate
Soft 0–60 mg/LModerately hard 61–120 mg/LHard 121–180 mg/LVery hard 181+ mg/L

Lake Forest Park sits close to the typical Washington figure of 36 mg/L. Of the 10 nearest cities we track, 7 have softer water and 3 have harder. The range nearby runs from 13 mg/L in Brier to 35 in Edmonds.

What 30 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 30 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 Lake Forest Park's water system

Seattle Public Utilities · PWSID WA5377050

No health-based violations since 2016

Serves about 1,161,961 people from surface water.

Health-based
0
Monitoring or reporting
0
Open now
0

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

No. It measures about 30 mg/L (1.8 grains per gallon), which the USGS classes as soft.

What is the water hardness in Lake Forest Park in grains per gallon?

About 1.8 gpg. One grain per gallon equals 17.1 mg/L, so 30 mg/L divided by 17.1 gives 1.8.

Has the Lake Forest Park water system had EPA violations?

EPA records show no health-based violations for Seattle Public Utilities since 2016.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, October 12, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.