An environmental nonprofit is threatening to sue Sonoma Water over a massive January sewage spill that sent an estimated 5.5 million gallons of untreated wastewater flowing into the Russian River near Guerneville — the largest such overflow in more than 40 years.
California River Watch, a Sebastopol-based nonprofit, sent a formal notice of intent to sue on March 18, targeting both Sonoma Water and the Russian River Sanitation District for alleged violations of the federal Clean Water Act. The group is represented by attorney Jack Silver, a veteran of North Bay water-quality cases. Sonoma Water has roughly 60 days from that notice to respond with remedial action before the lawsuit proceeds.
The spill occurred January 6 through 8, 2026, as a powerful storm system drenched the North Bay. The treatment plant’s main basin and emergency storage pond both overflowed, and effluent traveled approximately a quarter-mile south through a wooded corridor before reaching the river, according to the Press Democrat. The plant, located on Neeley Road near Guerneville, is 43 years old and serves roughly 3,200 customers from Rio Nido to Vacation Beach.
The lawsuit notice alleges the district failed to maintain aging infrastructure, failed to carry out timely repairs, and failed to post public health warning signs promptly — signs went up less than a day after the spill began. California River Watch is proposing eight remedial measures, including a full system review, new protocols for preventing future spills, and enhanced public notification requirements.
The stakes extend well beyond the roughly 3,200 households on the sanitation district’s system. The Russian River serves as a primary water supply for an estimated 600,000 people across central Sonoma County and into northern Marin County. The river also provides critical habitat for threatened Coho salmon and steelhead trout, making large sewage discharges a flashpoint for both public health and conservation concerns.
Sonoma Water spokesperson Stuart Tiffen declined to comment on the litigation notice. The district is actively pursuing a $47 million grant to fund infrastructure improvements at the aging Guerneville plant, including force main replacement, lift station rehabilitation, and broader facility upgrades. Only smaller upgrades — including an ultraviolet disinfection system — have been completed in recent years.
David Weinsoff, a staff attorney at California River Watch, described aging sewage infrastructure as “a big problem statewide,” noting the Guerneville situation is part of a broader pattern of deferred maintenance at municipal treatment plants. California River Watch previously sued over multiple spills from the same district between 2010 and 2015, though those cases were ultimately dismissed. In 2004, the group successfully challenged the city of Healdsburg over discharges into a pond connected to the Russian River.
Residents in the Russian River Sanitation District already pay some of the highest sewer rates in Sonoma County. Any court-ordered infrastructure overhaul — or even a negotiated settlement requiring major upgrades — could put further pressure on those rates. A response from Sonoma Water is expected by mid-May.
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