Canyon County, ID Landscaping Rules: Composting (2026)

Canyon County Code Chapter 2, Article 3 (Solid Waste Disposal Regulations) makes it unlawful for anyone in unincorporated Canyon County, Idaho to accumulate solid waste in a yard, lot, place, or premises, or on an adjacent street, alley, or sidewalk. Section 02-03-13(2), Prohibited Acts, carves compost out of that prohibition: piles maintained for fertilization purposes are allowed, and matter used for fertilization can be transported, kept, and used, as long as it does not rise to a nuisance. The code sets no numeric standard for a compost pile: there is no square-footage cap, no required enclosure or bin material, and no setback distance written into this section.

The entire legal test is whether the pile constitutes a nuisance, a determination the Canyon County sheriff's code enforcement officer makes case by case once a complaint comes in. Because the exemption sits inside the solid waste article rather than a standalone landscaping chapter, the same officer who investigates illegal dumping at the Pickles Butte site evaluates a compost complaint. Section 02-03-15, Penalty, governs enforcement: a violation of the article other than the mandatory disposal requirement (02-03-08) or the open-burning limitation (02-03-13(4)) is a misdemeanor punishable by a fine of not more than three hundred dollars for each separate violation, cited by uniform citation under Idaho's infraction or misdemeanor criminal rules and served on the property owner or occupant.

This rule governs only the unincorporated territory of Canyon County: it does not reach inside Caldwell, the county seat, Nampa, the county's largest city, or Middleton, Greenleaf, Melba, Notus, Wilder, Parma, and Star, each of which enforces its own municipal code on yard waste and composting.