Algae sparks concern at Donner Summit
Green algae set off red flags at the headwaters of the South Fork Yuba River where Donner Summit wastewater was being discharged earlier this summer.
The Donner Summit Public Utility District received a notice of violation from the California Regional Water Quality Control Board, Central Region, on Aug. 8 for fungi, slime and other objectionable growth resulting from discharge into the river in June.
But state officials suspect weather may have played a role in the algae bloom.
“We have identified the algae, and it is not a public health concern,” said utility district General Manager Tom Skjelstad. Nevertheless. “We’re taking this very seriously.”
This was the first time in 20 years of operation that such a discharge occurred, Skjelstad added.
“Even the downstream users that reported this said this is the most unusual thing they’ve ever seen,” he said. “With algae showing up in Tahoe and one person reporting it in Lola Montez, we’re wondering if this is a regional thing.”
Ken Landau, assistant executive officer for the California Regional Water Quality Control Board, said the algae couldn’t be completely pinned on the utility district’s discharge with 100 percent certainty.
“It has certainly been a real dry year with very little diluting water, and it was warmer earlier in the year,” Landau said.
But Skjelstad said it is reasonable to conclude that the district is at least a major contributor, adding that getting rid of nitrates has been a constant problem for the district.
Just as nitrates feed algae and can cause a bloom, the wastewater plant uses biological treatment to “eat” the nitrates as a way to get rid of them before they reach the river, Skjelstad said, but the organisms have a tough time on the summit.
With the large second-homeowner population on the summit, wastewater volume changes drastically throughout the year – meaning the organisms have nothing to eat sometimes and die off, then are overwhelmed later.
Cold water also makes it hard for the organisms to operate, Skjelstad said.
The district plans to enact a more extensive monitoring plan along the South Fork of the Yuba, Skjelstad said, responding to the water quality control board by the Sept. 8 deadline.
Developers of the proposed Royal Gorge resort and residential site have suggested sending waste water from more than 900 additional homes into the district’s treatment plant, which would have to be expanded to accommodate the increase.
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