Residents downstream from Peterborough may want to boil their water, after heavy rainfall has led to a discharge of partially-treated sewage into the Otonabee River. On Thursday, Sept. 23, around 1 p.m., the city’s Twitter account posted a notice saying that due to current water conditions, the city water treatment plant had to “start a temporary, partial bypass.” "This means that some partially treated sewage is being discharged to the Otonabee River," reads the Tweet.