Lynden Water Hardness & Quality Report (2026)

Lynden, Washington, in Whatcom County — a Whatcom County city adjacent to Bellingham and Ferndale near the Canadian border in northwest Washington — receives its water from the City of Lynden Water, drawing from Fishtrap Creek or the Nooksack River watershed (Whatcom County) through the northwest Washington distribution.

The moderately soft 69.5 mg/L hardness and TDS of 173.5 mg/L reflect the northwest Washington Whatcom County supply's soft character — driven by the North Cascades insoluble bedrock watershed and the Fraser Valley glacial drift aquifer with limited calcareous dissolution, typical of the northwest Washington border communities on the Nooksack-Fraser River system. The Nooksack-Fraser watershed at Whatcom County — Cretaceous Twin Sisters Dunite (insoluble — primary dilutant), Pleistocene Fraser Valley glacial drift (slightly calcareous — primary hardness contributor), and Eocene Chuckanut Formation (insoluble — dilutant).

At 69.5 mg/L, Lynden's water is moderately soft — light scale forms slowly in appliances, dishwashers remain efficient, and bathroom fixtures need occasional cleaning. Semi-annual descaling is appropriate. The PFAS level of 3.1 ppt warrants a certified drinking water filter — the Whatcom County northwest Washington industrial-agricultural corridor contribute to Lynden's readings.