Environmental Rules in Canyon County, ID (2026)
3 rules for unincorporated Canyon County, Idaho.
Verified from official government sources
Stormwater Management
Canyon County requires every preliminary plat filed for a subdivision in unincorporated Canyon County, Idaho to state the type of stormwater disposal facilities proposed and to support that design with supporting evidence when required. The Board of County Commissioners can also require stormwater retention and disposal improvements as a condition of subdivision approval.
Canyon County Subdivision Stormwater Rules
Some RestrictionsCanyon County Code §§ 07-17-09(1)E.3, 07-17-31(2)
3. Stormwater Disposal: A statement as to the type of stormwater disposal facilities which may include evidence as may be required to the design and operation of proposed stormwater system. ... (2) Subdivision Improvements: The commission or hearing examiner may recommend and the Board may require improvements in the subdivision, for example curbs, gutters, sidewalks, streetlights, ribbon ...
Flood Zones
Before anyone can grade, fill, build or otherwise develop land inside a mapped special flood hazard area in unincorporated Canyon County, Idaho, Canyon County Code § 07-10A-05(3) requires a floodplain development permit. The special flood hazard areas come from the county's 2019 Flood Insurance Study and FIRM maps, and unpermitted development is a criminal violation enforced under the code's general penalty.
Canyon County Floodplain Development Permit
Significant RestrictionsCanyon County Code § 07-10A-05(3)
(3) Establishment Of Floodplain Development Permit: A floodplain development permit shall be required in conformance with the provisions of this article prior to the commencement of any development activities within special flood hazard areas determined in accordance with the provisions of section 07- 10A-09 of this article. ... (8) Enforcement: It shall be unlawful for any person to fail t...
Flood Elevation Requirements
Unincorporated Canyon County, Idaho requires one foot of freeboard above the base flood elevation before it will approve new construction in a mapped special flood hazard area. Canyon County Code § 07-10A-11(2)A requires the lowest floor of any new or substantially improved residential structure, including manufactured homes, to sit no lower than that flood protection elevation.
Canyon County Flood Elevation & Freeboard Rule
Some RestrictionsCanyon County Code §§ 07-10A-03, 07-10A-11(2)A
FLOOD PROTECTION ELEVATION (FPE): The base flood elevation plus the freeboard. ... FREEBOARD: A factor of safety usually expressed in feet above a flood level for the purposes of floodplain management. ... Freeboard ... shall be one foot (1'). ... A. Residential Construction: New construction, substantial improvements, and development of any residential structure (including manufactured home...
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