FOG can be a big problem in San Francisco — not the misty kind that famously blankets the City by the Bay, but sewer-clogging fats, oils, and grease. FOG is a sticky problem for the San Francisco Public Utilities Commission (SFPUC), largely because of the many restaurants for which the city is known.The men and women of SFPUC fight to keep FOG out of the city’s 1,000 miles of combined sewers, which carry 80 mgd of wastewater. They clean out gooey plaque that causes blockages. They clean up FOG-caused sewage backups and overflows. They fix sections of sewer broken as
