The Orange Water and Sewer Authority responded to an overflow of untreated wastewater from a sewer manhole at around 9:15 a.m. Tuesday.

The overflow occurred at the Park at Chapel Hill apartments in the 1200 block of Ephesus Church Road and was stopped at about 9:35 a.m.

OWASA estimated the volume of the overflow was about 200 gallons based on the known duration, and was most likely a result of an accumulation of grease that blocked the flow of water.

The spill occurred in the Booker Creek drainage basin and OWASA crew disinfected and flushed the area with water.

OWASA reported the spill to the N.C. Division of Water Quality, which is reviewing the matter.