Over one (1) million gallons of raw sewage was spilled northeast of Bishop Hills at the lift station at 7100 Cliffside Road.
The city says the wastewater overflow came from a manhole and was caused by a mechanical failure of a coupler.
A total of 1,026,000 gallons of untreated wastewater was released.
Crews vacuumed up most of the wastewater and added chlorine to the rest and had the cleanup done by 8 p.m. Monday
The Texas Commission on Environmental Quality (TCE) was notified and is working with the city to minimize environmental impacts.