There does not appear to be a nitrate problem in the ground water in Door County. Deep wells in the southwestern part of the county are most likely to produce water contaminated with naturally occurring radium or sulfates. In that area, it may be prudent to obtain water from above the shale before drilling deeper. However, constructing a well with less casing to obtain water above the shale may increase the potential for bacterial contamination. The DNR should continue to grant casing variances and special approvals unless future studies indicate otherwise.
Quarterly sampling for at least one year is needed.
Sample wells in the vicinity of any well with a confirmed bacteriologically unsafe test result. Determine construction of wells prior to sampling. Concentrate more on wells with less than 100 feet of casing. Sample deep wells outside of southwest Door County for radium. Resample the wells shown to have a contamination problem in this study.