The San Francisco Public Utilities Commission's water and power enterprise operations have not been impacted by California's wildfire, according to voluntary disclosure filed with the Municipal Securities Rulemaking Board on Aug. 27.

The massive Rim Fire is burning at or near the commission's facilities, including its Hetch Hetchy reservoir in the Sierra Nevada Mountains and Yosemite National Park.

The disclosure addresses the impact of the wildfire on the commission's water operations and lists 12 issues of water revenue bonds that are related.

These include $701 million of 2012 Series ABC bonds, $721 million of 2011 Series ABCD bonds, and $532 million of 2010 Series FG bonds.

The commission's water revenue bonds are secured by revenues of its water enterprise.

"As of Tuesday, August 27, 2013, there continues to be no change in or impact to water quality or deliver from the Hetch Hetchy Reservoir," the commission reported. "The Hetch Hetchy Regional Water System continues to deliver high-quality water to 2.6 million water customers in San Francisco and throughout the Bay Area."

Due to the rocky, granite terrain and limited brush around the reservoir, the commission believes the risk for damage to direct water quality is limited.

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