With the Davenport Wastewater Treatment Plant unable to handle the inflows, the city of Bettendorf has been forced to pump more than 200 million gallons of diluted untreated sewage into the Mississippi River so far this year.
Five times this spring and summer the wastewater treatment plant has been unable to handle the sewer flows and crews have partially closed the riverfront interceptor lines between Bettendorf and Davenport. Then, to prevent sewage from backing up into homes and businesses along the riverfront, Bettendorf runs six to nine large pumps to flush the wastewater into stormwater pipes, which discharge into the Mississippi River.
A total of 201 million gallons of "sanitary sewer overflows" has been dumped into the river so far this year, according to reports filed with the Iowa Department of Natural Resources (IDNR). Between April 17 and April 27, 98 million gallons of sewage was pumped into the river, and another 68 million gallons of sewage was dumped between May 26 and June 3. Between May 3 and May 5, 16 million gallons of sewage was pumped into the river, 9.4 million gallons was flushed into the river from April 10 through April 12, and 8.8 million gallons went into the river on March 10.
All the pumping – "sewage overflow events" as they are termed by the IDNR – must be reported by the city to the state.