Flooding in Iowa has washed hog and cattle manure from more than 20 farms each with thousands of animals.
Iowa Citizens for Community Improvement, an environmental advocacy group says the problem highlights the need for stricter water protection regulations. The group says farms should be required by clean water permits to increase manure storage capacity or reduce herd size so they are handling less manure.
Iowa Department of Natural Resources records show at least 20 incidents in the last half of June of overflowing manure storage basins or feedlots washed out causing manure to flow into fields, ditches and in a few cases streams.
Manure flowing into streams makes it difficult for drinking water providers like Des Moines Waterworks to remove high levels of nitrate.