20220110 13561100 1.0 TRUE MDH Wellhead Protection Areas Wellhead Protection Area (WHPA) is the Minnesota Department of Health (MDH) approved surface and subsurface area surrounding a well or well field that supplies a public water system, through which contaminants are likely to move toward and reach the well or well field (Minnesota Statutes, section 1031.005, subdivision 24). Minnesota Department of Health, Environmental Health Division, Drinking Water Protection Section, Source Water Protection Unit