In the early 2000s, the City of San Diego had a major increase in sewage spills. This was due in large part because the City's aging sewer infrastructure was in need of replacement, repair and upgrades. Some pipelines had been in operation for a hundred years.
Beginning in 2007, the City sewer rates were increased by 8.75% in 2007 and 2008, and 7% in 2009 and 2010 to operate, maintain, repair and upgrade the City's wastewater system. These rate increases are paying for more than $585,385,000 of necessary sewer system upgrades. These projects include replacement of sewer mains, sewer pipeline rehabilitation, and sewer pump station improvements.
Sewer System Improvement projects are funded by the rate increases.