Lakewood Water Hardness & Quality Report (2026)

Lakewood, Washington, in Pierce County in the south Puget Sound area southwest of Tacoma — a major south Puget Sound suburban city, home of Joint Base Lewis-McChord (JBLM) — draws its municipal water supply from the Nisqually River watershed and City of Tacoma (Tacoma Water) Green River system via the Lakewood Water District, sourcing Cascade Range glacier-fed river water for the south Pierce County area. Water hardness in Lakewood measures 26.5 mg/L — classified as extremely soft.

Lakewood's extraordinary softness reflects the Cascade Range volcanic watershed sourcing. The Green River (Tacoma Water source, originating near Green River Falls in King County) and Nisqually River (from Nisqually Glacier on the south slopes of Mount Rainier) both drain the Cascade Range — dominated by Quaternary Mount Rainier andesitic and basaltic volcanic rocks (very calcium-poor high-alumina andesite of Cascade arc volcanism), Pliocene High Cascade lava flows (basalt), and Eocene crystalline Cascades (granodiorite and schist — calcium-poor). Mount Rainier's glacial meltwater is among the purest and softest water available anywhere in the United States. The dominant Cascade volcanic and crystalline terrain produces the extraordinary 26.5 mg/L softness.

With hardness at 26.5 mg/L, Lakewood residents experience essentially no scale challenges. Lakewood Water District consistently delivers water meeting all Washington DOE and EPA Safe Drinking Water Act requirements.