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Clarithromycin has been found in [[sewage sludge]]. In the [[Targeted National Sewage Sludge Survey]], a 2009 test of 84 samples of sewage sludge from around the U.S., the [[EPA]] found clarithromycin in 45 samples (54%) in concentrations ranging from 8.68 to 617 parts per billion.<ref>[http://nsdi.epa.gov/waterscience/biosolids/tnsss-overview.html Targeted National Sewage Sludge Survey Report], US EPA website, Accessed August 28, 2010.</ref>There are no federal regulations governing how much of this drug may be present in sewage sludge applied to land as fertilizer.