Section 401 Water Quality Certification Public Notice
North Marin Line Stabilization Project
The San Francisco Regional Water Quality Control Board is currently reviewing an application for the following project for water quality certification under Section 401 of the Clean Water Act. We encourage public comments on the proposed work, which will be considered in the decision on certification. You may submit comments on this project to the staff member below.
| Project Name: |
North Marin Line Stabilization Project |
| City/County: |
Unincorporated, Marin County |
| Comment Period: |
11/07/2026 - 11/27/2026 |
| Project Description: |
Marin Water is proposing to stabilize and improve its existing NML water transmission pipeline in the unincorporated community of Lagunitas in Marin County. The proposed pipeline improvements include two locations where the NML crosses San Geronimo Creek via a 34-inch-diameter ACCP featuring unrestrained bell and spigot joints, which present structural and environmental concerns that the proposed upgrades aim to address. Both crossings are part of the NML, which was originally constructed in 1957. The NML serves as a critical conveyance system for raw water sourced from Marin Water’s Kent Lake and Nicasio Reservoir, delivering it to the San Geronimo Treatment Plant. |
| Project Files: |
Contact Staff for files |
| Staff Contact: |
Kelsey Kruger (510) 622-2357 Water Quality Control Board 1515 Clay Street, Ste 1400 Oakland, CA 94612 |
