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A high density of human population is generally correlated with higher <\/SPAN><\/SPAN>E. coli<\/SPAN><\/SPAN>in surface water, for reasons which may include; pet waste, illicit connections, failing septic systems, and attracting nuisance wildlife such as raccoons. This layer shows areas with more than 912 housing units per square mile (or, above the average housing unit density for the census blocks in the state). This layer will be replaced in full after each decennial Census. <\/SPAN><\/P><\/DIV><\/DIV><\/DIV>", "copyrightText": "Molly Rippke, Water Resources Division, Michigan Department of Environment, Great Lakes, and Energy (EGLE).\nData Sources: \nU.S. Census Bureau (2012). Census of Population and Housing, 2010 [United States]: Redistricting Data (Public Law 94-171) Summary File. C. B. 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