Another 3.5 million gallons of untreated wastewater discharged into the Mississippi River on Wednesday.
The Metropolitan St. Louis Sewer District says that a power outage at the Bissell Point Wastewater Treatment Plant caused the discharge. Bissell Point was also the location of another sewage discharge situation in April.
In that two-day event, sewage was flowing into the river at a rate of 105 million gallons per day at its onset.
Even at that rate, MSD spokesperson Lance LaComb said the risk to public health was low.
In a statement, MSD calls the incident Wednesday "unacceptable" and says they have reported it to the Missouri Department of Natural Resources as is required.