Sources and risk factors for nitrate and microbial contamination of private household wells in the fractured dolomite aquifer of northeastern Wisconsin - Borchardt, Mark; Stokdyk, Joel; Kieke, Burney; Muldoon, Maureen; Spencer, Susan; Firnstahl, Aaron; Bonness, Davina; Hunt, Randall J.; Burch, Tucker R. (Environmental Health Perspectives, 2021)