Sedro-Woolley, WA water hardness

Tap water hardness
18mg/L
1.1gpg
Soft

Reported by Skagit County PUD 1 Judy Res · December 2024

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

Sedro-Woolley water measures 18 mg/L (1.1 gpg) of hardness, soft by USGS standards. The number comes from Skagit County PUD 1 Judy Res, dated December 2024.

Sedro-Woolley on the hardness scale, with nearby cities
060120180240300360+WA typical 36Burlington: 18 mg/LBurlington 18Mount Vernon: 18 mg/LMount Vernon 18Everett: 19 mg/LEverett 19Bellingham: 29 mg/LBellingham 29Arlington: 29 mg/LArlington 29Marysville: 29 mg/LMarysville 29Lake Stevens: 36 mg/LLake Stevens 36Snohomish: 36 mg/LSnohomish 36Oak Harbor: 45 mg/LOak Harbor 45Port Townsend: 60 mg/LPort Townsend 60Sedro-Woolley 18mg/L as calcium carbonate060120180240300360+WA 36Burlington: 18 mg/LBurlington 18Mount Vernon: 18 mg/LMount Vern. 18Bellingham: 29 mg/LBellingham 29Arlington: 29 mg/LArlington 29Marysville: 29 mg/LMarysville 29Oak Harbor: 45 mg/LOak Harbor 4518 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 18 mg/L, Sedro-Woolley is 18 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 18 mg/L in Burlington to 60 in Port Townsend.

What 18 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 18 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 Sedro-Woolley's water system

Skagit County PUD 1 Judy Res · PWSID WA5379500

No health-based violations since 2016

Serves about 111,415 people from surface water.

Health-based
0
Monitoring or reporting
2
Open now
0

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

No. It measures about 18 mg/L (1.1 grains per gallon), which the USGS classes as soft.

What is the water hardness in Sedro-Woolley in grains per gallon?

About 1.1 gpg. One grain per gallon equals 17.1 mg/L, so 18 mg/L divided by 17.1 gives 1.1.

Has the Sedro-Woolley water system had EPA violations?

EPA records show no health-based violations for Skagit County PUD 1 Judy Res since 2016. There were also 2 monitoring or reporting violations, which are about late or missing tests and notices.

Nearby cities

All 145 cities in Washington

Hardness data: TapWaterData US Water Hardness (utility report, December 2, 2024), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.