Stanislaus and Tuolumne Rivers Groundwater Basin Association Groundwater Sustainability Agency

Groundwater Sustainability Plan Development

STRGBA GSA's primary focus is the development of a Groundwater Sustainability Plan (GSP) to adopt and begin implementation by January 31, 2022.

STRGBA Timeline

Throughout this process, STRGBA welcomes involvement and input from subbasin stakeholders - groundwater users, business representatives, and other interested members of the public including the disadvantaged communities in the subbasin.

Modesto Subbasin Groundwater Sustainability Plan Draft

Draft sections of the GSP will be prepared as we develop the modeling tools and collect data. To ensure a transparent and collaborative plan development process, all draft sections of the GSP will be posted for ongoing review and comment. The sections will be assembled into a Review Draft GSP by late summer 2021. Comments on the GSP can be submitted via email to