Des Moines Register: The company whose pipeline dumped more than 46,000 gallons of diesel on northern Iowa farmland in January has had more spills than any other pipeline operator in the state over the past 16 years, according to a Des Moines Register analysis. Magellan Midstream Partners pipelines leaked 27 times in Iowa between 2000 and 2016, spewing tens of thousands of gallons of hazardous products, according to Iowa Department of Natural Resources data.