With the primary election just 11 days away, donations to independent campaigns are mounting fast in high-stakes races for mayor and school board.

Donations have topped $20 million in the races for three citywide offices, seven City Council seats and three each on the boards of Los Angeles Unified and the Los Angeles Community College District.

In the reports due Thursday, City Councilman Eric Garcetti reported a cash balance of $1.5 million in his run for mayor, including $450,000 raised in the last month.

Controller Wendy Greuel, another mayoral candidate, reported $1.6 million in cash, after raising $475,000 in the most recent period. She has raised more than $4.7 million for the race.

Greuel also has been helped with independent expenditure committees, which have put in more than $1.2 million, primarily from the IBEW through its Working Californians Committee and the Los Angeles Police Protective League.

The latest campaign figures for Councilwoman Jan Perry, Kevin James and Emanuel Pleitez were not immediately available.

The campaign of James, the former radio talk show host and federal prosecutor, has been bolstered by more than $431,000 in independent expenditures from Republicans.

Independent expenditures continue to dominate the school board election, with reform- and union-backed organizations battling to guide the future of the nation’s second-largest school district.

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