Union City does not restrict backyard composting, and its Water Efficient Landscape ordinance (UCMC 18.112) requires compost in permitted landscape installations. SB 1383 organics recycling is provided through the City's curbside green-cart program.
No Union City ordinance prohibits residential backyard composting; the City's IPM policy lists mulching among preferred methods (UCMC 12.16.150). For permitted landscape work, UCMC §18.112 requires compost: a minimum of four cubic yards per 1,000 square feet of permeable area incorporated to a six-inch depth (unless soil tests show 6% organic matter or sheet-mulching is used), plus a three-inch mulch layer on planting beds. Statewide, California's SB 1383 requires jurisdictions to provide organic-waste collection and divert organics from landfill; Union City meets this through its franchised curbside green-cart program. Backyard composting is an approved way for residents to handle their own organics, but piles must not create odor or rodent nuisances actionable under the City's weed-abatement provisions.
Backyard composting itself is not penalized. A pile that becomes an odor or refuse nuisance can be cited under UCMC Chapter 7.08 with the Notice to Clean Premises and lien remedy. Projects that omit required compost or mulch under UCMC
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