The HHPLS identified the infiltration potential of the upland areas within the subwatershed as low to medium. Because of the organic nature of the soils in the central wetland area, infiltration potential there is variable (see Figure 16). The Hennepin County Geologic Atlas classifies most of the upland areas as being of low sensitivity to pollution, and the central wetland area as highly sensitive (see Figure 17).
Part of the Dutch Lake subwatershed has been designated by the Minnesota Department of Health as a Drinking Water Sensitivity Management Area (DWSMA) for a city of Minnetrista public well. While the aquifer sensitivity is high, the MDH has designated this area to be of a low risk and low vulnerability to contamination of the drinking water supply. The City of Minnetrista has completed its wellhead protection plan, and Figure 18 shows the DWSMA and associated Wellhead Protection Area for that well.