There are plenty of undesirable things in San Francisco’s sewers. But one, in particular, has grabbed the attention of city officials: FOG.

Not to be confused with the city’s weather element, this FOG is a sewer-industry acronym for fats, oils and grease.

The stuff clogs sewer pipes, produces a nose-holding stench and attracts rats and roaches.

Every year, about 4 million gallons of FOG is discharged into the city’s wastewater system, costing the San Francisco Public Utilities Commission roughly $3.5 million. Of the 6,000 sewer blockages the agency responds to annually, almost half are related to grease. In a city with more than 2,500 eateries packed into 47 square miles, the restaurant industry is a major contributor to the problem.

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