DISCOVERY BAY, Contra Costa County — The California Division of Boating and Waterways has identified parts of the Sacramento–San Joaquin Delta, including waters around Discovery Bay, as potential areas for invasive aquatic plant management in 2026.
A California State Parks announcement describes a treatment window from March 19 through November 30, 2026, with individual locations determined by field surveys, water temperatures and fish surveys. The plan lists Discovery Bay, Delta Coves and nearby Old River-area locations among places where treatment could be carried out following required notices.
Does this mean herbicides are being applied right now?
No. Being named as a potential treatment area does not establish that an application occurred on a particular day or that a specific lagoon is being treated as this article is published. Residents should check the department’s current project notices for actual locations and treatment dates.
The state identifies aquatic invasive plants as a concern because dense growth can obstruct navigation, interfere with recreation and affect aquatic habitat. The agency’s listed herbicides include fluridone, diquat, flumioxazin and endothall, depending on conditions and approved use.
Where can boaters launch?
The State Parks boating directory identifies Discovery Bay Marina, 5901 Marina Road, as a publicly accessible marina and boat-launch facility on Delta waterways. Its listed contact telephone is 925-634-5928. The facility directory includes services such as fuel, boat maintenance and sewage or bilge pump-out facilities.
Listing these services is not a promise that each one is available at any hour. Call the marina for current rates, launching arrangements, depth restrictions and temporary service interruptions.
How residents can follow the issue
- Read the 2026 aquatic plant control announcement.
- Look for location-specific updates and any required public notices from the Division of Boating and Waterways.
- Observe posted water-use restrictions during and after any actual treatment.
- Contact the appropriate marina or state agency before making assumptions about impacts on a particular dock, water intake or swimming location.
In a community built around Delta waterways, the distinction between a proposed treatment location, a scheduled application and completed work matters for environmental transparency and safe recreation.
Sources: California State Parks March 2026 aquatic invasive plant control announcement and Discovery Bay Marina state facility listing. No site-specific treatment date is invented.
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