Sonoma County officials warn residents after wastewater leaks into Russian River during flooding

BySuzanne PhanKGO logo
Wednesday, January 7, 2026
Wastewater leaked into Russian River during Sonoma Co. flooding

GUERNEVILLE, Calif. (KGO) -- Sonoma County officials are warning residents near Russian River about a major spill involving untreated wastewater during overnight flooding near Guerneville Tuesday morning.

According to Sonoma Water, there was so much rain overnight that the Russian River Treatment plant south of Guerneville reached capacity early Tuesday morning.

"A portion of the discharge is traveling roughly one-quarter of a mile through a forested area before reaching the mainstem of the Russian River," the agency wrote in a press release.

Water officials say affected community members were notified this morning and that they are working to assess the potential impacts.

MORE: Here's what caused the Bay Area's highest king tides since 1998

"Community members are advised to stay away from the Russian River, which remains under storm conditions," agency officials advised.

The lower Russian River in Guerneville reached 28.61 feet at 2 a.m. Tuesday morning.

One homeowner told ABC7 News that the flooding was much worse than anything he's experienced in the past.

"The water came up fast, though, really, really fast," said Steven Cline.

VIDEO: 'It's been insane': King Tides, storms bring 4th day of flooding to Marin County

In the North Bay, it's been another stressful day for residents in Marin County, where heavy rain and King Tides are bringing more flood fears.

The flooding was so fast- that Cline was unable to rescue several chickens and a peacock from an outdoor coop, and all three birds perished.

"This covered our yard faster than we could deal with," described Cline.

Sonoma County fire officials say the ground was so saturated from previous rain, that the water had nowhere to go, but up and over the banks of the Russian River.

The Guerneville School District cancelled classes on Tuesday so that residents could continue dealing with the aftermath of this latest round of flooding.

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