North Creek Water Hardness & Quality Report (2026)

North Creek, Washington, in Snohomish County — a major north Seattle suburban community (North Creek is a significant Snohomish County census-designated place — a north Seattle suburban community adjacent to Bothell and Mill Creek; North Creek is part of the rapidly growing Bothell–Mill Creek–North Creek suburban corridor in south Snohomish County; the North Creek corridor along SR-522 and I-405 is one of the most important biotechnology and technology employment corridors in the Seattle metropolitan area (the Canyon Park Business Center and the North Creek business corridor contain major employers including biotech companies and technology firms; the region is part of the broader SR-522 technology corridor connecting Bothell to Seattle)); North Creek and the adjacent Mill Creek area represent some of the fastest-growing suburban communities in the Seattle metropolitan area, driven by Amazon and Microsoft employment and the general expansion of the Seattle tech economy northward into Snohomish County, a diverse Snohomish County community with a primarily professional, technology industry, and suburban family population — draws its municipal water supply via the Alderwood Water and Wastewater District. Water hardness in North Creek measures 79 mg/L — classified as moderately soft.

North Creek's moderate softness reflects the north Seattle Snohomish County Cascades watershed's calcareous-poor character. The Spada Lake watershed drains the Quaternary calcareous-poor Cascades volcanic geology with effective treatment, producing the moderately soft 79 mg/L.

With hardness at 79 mg/L, North Creek residents enjoy moderately soft water. Alderwood Water and Wastewater District consistently delivers water meeting all Washington Ecology and EPA Safe Drinking Water Act requirements.