North Dakota's Health Department has fined two septic tank pumping companies for improper wastewater disposal in the state's western oil patch in 2011 and 2012.
Stanley-based MonDak Water and Septic Service was fined 200-thousand dollars and Fairview, Montana based Hurley Enterprises was fined 500-thousand.
Hurley also is responsible for developing a compliance training program, and MonDak has developed wastewater treatment lagoons.
State Water Quality Director Dennis Fewless says drivers for the companies improperly disposed of septic tank wastewater on farm fields more than 150 times.
He says a handful of drivers also were fined 15-hundred dollars each.