TY - RPRT TI - Sources and risk factors for nitrate and microbial contamination of private household wells in the fractured dolomite aquifer of northeastern Wisconsin AU - Mark A. Borchardt AU - Joel P. Stokdyk AU - Burney A Kieke AU - Maureen A. Muldoon AU - Susan K. Spencer AU - Aaron D. Firnstahl AU - Davina Bonness AU - Randall J. Hunt AU - Tucker R. Burch PY - 2021 DO - 10.1289/ehp7813 UR - https://pubs.usgs.gov/publication/70221581 ID - 70221581 ER -