About 4,800 gallons of sewage may have entered a south Forsyth creek during a spill over the weekend.

A blown-off valve at a Forsyth County pump station on Mountclaire Drive caused the leak, according to Jill Pilcher with Forsyth County’s water and sewer department.

The affected force main pipe was shut off from about 11:15 a.m. to 6:30 p.m. Saturday while a contractor handled repairs, Pilcher wrote in an e-mail.

“Signs have been posted and the area was cleaned and limed,” she wrote. “Monitoring has been set up.”

A report came in about 8:30 a.m. from a Longlake subdivision resident, who had noticed water leaking from the pump house into James Creek, Pilcher wrote.

About an hour later, a county supervisor determined it was a sewer leak.

An outside contractor was called in for the repair “due to the depth and severity of the failure,” she wrote.

The spill is classified as “minor,” or less than 10,000 gallons, by the Georgia Environmental Protection Division, which requires notification and monitoring following an incident.