Aquifer Definition
An aquifer is a permeable subsurface soil or rock layer that is capable of storing, transmitting, and supplying a significant amount of ground water to wells or springs.

Purpose
Critical aquifer recharge areas (PDF) are areas that have been identified as having a critical effect on aquifers used for potable water and as being highly susceptible to groundwater contamination. A goal of the Critical Areas Ordinance (CAO) is to preserve, protect, and conserve Whatcom County’s groundwater resources for current and future generations by protecting these areas from contamination.