Ferndale Water Hardness & Quality Report (2026)

Ferndale, Washington, in Whatcom County — a Whatcom County city adjacent to Bellingham and Blaine on the Nooksack River in northwest Washington — receives its water from the City of Ferndale Water, drawing from the Nooksack River watershed (Whatcom County) through the northwest Washington distribution.

The soft 69 mg/L hardness and TDS of 171.7 mg/L reflect the northwest Washington Whatcom County Nooksack River supply's soft character — the North Cascades' Jurassic insoluble volcanic and metamorphic formations contribute minimal calcareous dissolution, typical of the northwest Washington Cascades watershed communities (compare Snoqualmie WA: 30 mg/L softer; Ferndale somewhat harder from the Pleistocene glacial outwash contribution in the Nooksack delta). The Nooksack watershed at Whatcom County — Jurassic Chilliwack Group (insoluble — primary dilutant from North Cascades), Pleistocene Fraser Glaciation outwash (slightly calcareous — hardness contributor), and Quaternary Nooksack delta alluvium (slightly calcareous — TDS contributor).

At 69 mg/L, Ferndale's water is soft — scale forms very slowly in appliances, dishwashers remain efficient, and no softening is needed. Annual descaling is appropriate. The PFAS level of 3.0 ppt warrants a certified drinking water filter — the Whatcom County northwest Washington refinery corridor contribute to Ferndale's readings.