Why was San Pablo Reservoir closed to boats?

San Pablo Reservoir was closed to boats for a year due to the threat of invasive golden mussels which could clog water infrastructure.

What is the new rule for boats entering San Pablo Reservoir?

Boats must now undergo a 30-day quarantine period after inspection to ensure they are clean and dry before being allowed on San Pablo Reservoir.

When will Lake Comanche reopen to boats?

Lake Comanche, northeast of Stockton, is scheduled to begin allowing boats in May 2026.

Home / Environment / Boats Return to San Pablo Reservoir After Mussel Scare

Boats Return to San Pablo Reservoir After Mussel Scare

9 Feb

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Summary

San Pablo Reservoir reopened to boats after a year-long closure.
A 30-day quarantine rule is in effect for all returning boats.
Invasive golden mussels threaten water infrastructure with clogging.

Boats Return to San Pablo Reservoir After Mussel Scare

Following the discovery of invasive golden mussels near the Port of Stockton in late 2024, EBMUD implemented a year-long ban on boats in San Pablo Reservoir to protect its water infrastructure. The aggressive mussel poses a severe clogging threat to EBMUD's pipes. After observing various quarantine methods by other agencies over the past year, EBMUD has decided on a 30-day quarantine as the most effective solution.

As of Sunday, February 9, 2026, EBMUD has begun allowing boats back onto San Pablo Reservoir, initiating its inspection process. Boats must undergo inspection to be certified clean and dry, then be tethered to their trailers with sealed cables. After the 30-day quarantine period, they can enter and exit freely. However, if a boat visits another reservoir, it must undergo another 30-day inspection before returning to San Pablo. Kayaks can launch after inspection without quarantine.