San Antonio Water System is wrestling with EPA over sewage spills. The current SAWS "Don't feed the grease monster" campaign is part of an effort to control sewage spills. When the fat congeals it clogs the pipes. When the pipes get clogged, they overflow. This is a problem where ever there are sewers.
In San Antonio Water Systems and the EPA are negotiating on a solution to all too frequent sewer discharges into area rivers and streams. Grease diversion is believed to play a major role in preventing sewer overflows.
If you care enough about the environment to not litter and to recycle then add diverting grease to your list.
The video below features London sewer workers on location with a message in song concerning keeping the fat out of the drain.