The spill, which occurred Tuesday, originated from the intersection of Via Las Combres and Cirrus Street near Fashion Valley, entering the San Diego River and ultimately reaching Dog Beach.
Health officials estimated that emergency crews captured roughly 1,900 gallons of sewage, leaving about 1,500 gallons destined for Dog Beach where the San Diego River empties into the ocean.
The spill is believed to have occurred as a result of roots blocking a sewer line, health officials said.
The beach will remain closed until safe water-quality levels can be confirmed.
For the current status on coastal water closures or advisories in Ocean Beach or elsewhere in San Diego County, call (619) 338-2073 or visit www.sdwatersheds.org/wiki/Beach_Monitoring. Click on “beach status” at the top left.