Mariposa County, CA Landscaping Rules: Composting (2026)

Composting in unincorporated Mariposa County operates primarily under the statewide organic-waste mandate rather than a unique county composting ordinance. California Senate Bill 1383, effective January 1, 2022, requires residents and businesses to keep organic materials, such as food scraps, yard and plant debris, food-soiled paper, and untreated wood, out of the landfill, either through subscribed organics collection, self-hauling to an approved facility, or on-site management. Backyard (home) composting is expressly recognized under SB 1383 as an allowed way to manage organic material on-site, so residents who compost food and yard waste at home help satisfy the law; home composting is encouraged but not itself mandated. The County implements SB 1383 through its solid-waste program and franchise/transfer-station arrangements, so available collection service varies by location, and many rural residents rely on self-haul to county transfer stations or on-site composting. Because Mariposa County is rural, forested, and bear country, compost piles should be managed to limit odor and wildlife attraction, and kept away from structures consistent with PRC 4291 defensible-space and fire-safety practices. Residents should confirm local organics-collection availability and any transfer-station requirements with the County's solid-waste / Public Works program.