The HHPLS identified the infiltration potential of the upland areas within the subwatershed as medium to low with some areas of variability where the soils are organic in nature (see Figure 16). Areas of moderate to high or very high aquifer sensitivity roughly follow the Painter Creek corridor to Jennings Bay. Elsewhere the Hennepin County Geologic Atlas classifies most of the upland areas as being of low to moderate sensitivity to pollution (see Figure 17).
Two small corners of the Painter Creek subwatershed have been designated by the Minnesota Department of Health as Drinking Water Sensitivity Management Areas (DWSMA) for a City of Minnetrista well and a City of Long Lake well. The MDH has designated these areas to be of low risk and vulnerability to contamination of the drinking water supply. Figure 18 shows the DWSMAs and associated Wellhead Protection Areas.
The County Well Index has records of approximately 125 wells in the subwatershed, mostly shallow (less than 300 feet deep) domestic water supply wells.