California shuts all Tomales Bay shellfish beds after sewage leak
California closed every commercial shellfish growing area in Tomales Bay on 12 October after a septic leak sent sewage into a creek that drains into the bay. Hog Island Oyster Co., the largest operator on the water, has pulled roughly 200,000 oysters from the market as a precaution and stopped harvesting. No illnesses have been reported and the state has issued no consumer advisory, but the bay stays shut until water tests clear.
The Numbers
The California Department of Public Health closed all shellfish growing areas in Tomales Bay along with wet-storage intakes, according to Hoodline. The leak was reported on 9 October at Due West Tavern inside Olema House, a hotel about 15 miles from Hog Island's growing areas, and was capped the same week. Sewage reached Olema Creek, which flows into Lagunitas Creek and then into the southern end of the bay.
Hog Island's own notice sets out the scale:
Voluntary withdrawal of shellfish harvested between 14 September and 12 October, about 200,000 oysters, including product from its Sweetwaters and Earthquake Bay growing areas.
A standard precautionary closure of 21 days, unless testing shows the water is clean sooner.
State sampling allowed from 16 October. If results are satisfactory, harvesting could resume between 19 and 21 October. If not, the closure runs to 30 October.
The company farms 160 acres in Tomales Bay and 90 acres in Humboldt Bay, sells more than 5 million oysters and Manila clams a year and employed more than 300 people as of late 2024. Its Humboldt Bay farm stayed open, and orders are being filled from there and from partner farms in other certified areas.
Tomales Bay is not one business. Marin County's list of state-registered shellfish operators also includes Charles Friend Oyster Company, Cove Mussel Company, Marin Oyster Company, Point Reyes Oyster Company, Tomales Bay Oyster Company and Starbird Mariculture, so the closure covers mussel and clam growers as well as oyster farms. The full company statement is here.
What It Means for Buyers
Live and half-shell bivalves are a just-in-time category with almost no buffer. A bay closure does not thin out supply over a quarter; it removes it from menus within days, and restaurant buyers move to other origins immediately. That is what happened here, with Humboldt Bay and Pacific Northwest product filling the gap.
Documentation becomes the deciding factor at receiving. Anything harvested in Tomales Bay before 12 October was taken from certified water and remains legal to sell, but the burden of proof sits with the harvest tag: growing area, harvest date, wet-storage record. Buyers holding that stock should confirm the paperwork now rather than when a customer asks.
For importers of frozen half-shell bivalves, the read is narrower than it looks. A 21-day closure in one California bay is not a structural shift in US shellfish demand, and treating it as a reason to chase volume would be a mistake. The more useful signal is that buyers who had no second origin on file spent the week hunting for one. Origin diversification is the lesson, not the tonnage. That is a judgement, not a forecast.
The timing matters too. California's storm season is starting, and septic failures tend to surface with the first heavy rain, when groundwater rises and old systems give way. Precautionary closures in the region are more likely to repeat than to disappear.
What to Watch
Sampling results from 16 October and whether the bay reopens by 21 October or stays shut to 30 October.
Status of the mussel and clam operators in Marin County, which have had less public airtime than the oyster farms.
Sign-off on the septic repair at Olema House, since the county has said the system stays offline until work is complete.
Whether retail and food service buyers start asking for harvest-area documentation as a standing requirement rather than a one-off.
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This article was researched and drafted with the assistance of AI and is published for general information only. It does not constitute trading, pricing, or investment advice, and readers should verify all figures against the original sources linked above before making commercial decisions. Content on this page is partly AI-generated. Easy Seafood makes no warranty as to its accuracy or completeness.
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