Section 401 Water Quality Certification Public Notice
Johnston Ranch Habitat Enhancement and Agricultural Water Supply Improvement 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: |
Johnston Ranch Habitat Enhancement and Agricultural Water Supply Improvement Project |
| City/County: |
Unincorporated, San Mateo County |
| Comment Period: |
4/2/2026 - 04/22/2026 |
| Project Description: |
The San Mateo Resource Conservation District (RCD) is partnering with the MROSD and POST on the Johnston Ranch Habitat Enhancement and Agricultural Water Supply Improvement Project (project). The project will improve habitat quality and quantity in an existing degraded pond, create a new agricultural water reservoir, create stream and riparian habitat along a restored historic channel that will act as the new primary overflow for the enhanced pond, and address chronic erosion occurring along a man-made pond overflow channel. Moreover, the project will result in improved dry season instream flows, on nearby Arroyo Leon, by significantly reducing diversion during the forbearance season. |
| Project Files: |
Contact Staff for files |
| Staff Contact: |
Jackson Fimrite (510) 622-2310 Water Quality Control Board 1515 Clay Street, Ste 1400 Oakland, CA 94612 |
