The city of San Diego will face enormous budgetary pressures from the growing deficits in public pensions, both at a state and local level. In this policy brief, the author estimates that San Diego faces total of $45.4 billion, including $7.95 billion for the county pension system, $5.4 billion for the city pension system, and an estimated $30.7 billion share of unfunded liabilities for California state retiree benefits. These estimates are made by correcting the state and local pension plans' figures, which use a too-optimistic assumption that their investments will grow by about 8% per year for the indefinite future. Unless state and city pensions are brought under control, these skyrocketing costs could easily force San Diego to limit or forego many other important public expenditures, such as road repair, schools, and healthcare. (Contains 14 endnotes.) [For related reports, "Trouble Brewing: The Disaster of California State Pensions. State Research" (ED517459); "Trouble Brewing in San Francisco. Policy Brief" (ED517460); "Trouble Brewing in Orange County. Policy Brief" (ED517462); and "Trouble Brewing in Los Angeles. Policy Brief" (ED517461).]