"Emergency room visits related to gastrointestinal illness went up 13 percent in the eight days following extreme precipitation events in areas with combined sewer systems that discharged untreated sewage and storm water into drinking water sources, while no significant increase in such visits was seen at hospitals in areas where combined discharge overflowed into recreational waters or in areas without combined sewer overflows."
Combined sewer systems lead to risks of illness after heavy rains. EurekAlert. Sharon Parmet. April 9, 2015. http://www.eurekalert.org/pub_releases/2015-04/uoia-css040915.php
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