Water Quality and Tree Protection Ordinance Implementation Guide
Implementation Guide Water Quality & Tree Protection Ordinance BACKGROUND What is the definition of “earthmoving or earth-disturbing activity,” “stream”, On April 9, 2019, the Napa County Board of and “ephemeral streams or intermittent Supervisors (BOS) amended the County’s ? streams?” How do I know if I have any Conservation Regulations with the adoption of streams on my property? the Water Quality and Tree Protection Ordinance (WQTPO) to enhance requirements DEFINITIONS for stream, wetland, and municipal reservoir setbacks, and to increase tree canopy retention “Earthmoving or earth-disturbing activity” and preservation. These new requirements went means any activity that involves vegetation into effect on May 10, 2019. clearing, grading, excavation, compaction of the soil, or the creation of fills and embankments to Since 1991, the County’s Conservation prepare a site for the construction of roads, Regulations (Chapter 18.108) prohibited the structures, landscaping, new planting, and other construction of main or accessory structures, improvements (including agricultural roads, earthmoving activity, grading or removal of and vineyard avenues or tractor turnaround vegetation, or agricultural uses of land within areas necessary for ongoing agricultural required stream setbacks. With the adoption of operations). It also means excavations, fills, or the WQTPO, existing requirements were grading which of themselves constitute expanded to apply setbacks to wetlands and engineered works or improvements. ephemeral and intermittent streams. A “stream” is any of the following: The Conservation Regulations have also required minimum vegetation retention 1. A watercourse designated by a solid line or requirements within municipal water supply dash and three dots symbol on the largest watersheds. The retention requirements for scale of the United State Geological Survey vegetation canopy have been increased from maps most recently published, or any sixty to seventy percent and expanded to apply replacement to that symbol.
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