Environmental Rules in Nampa, ID (2026)
4 verified environmental rules for Nampa, Idaho, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
Nampa bans dumping pollutants into its municipal storm drain system and enforces the city's federal NPDES stormwater permit through Public Works inspections, notices of violation, mandatory best management practices, and cleanup of illicit connections.
Nampa Storm Drainage Discharge Rules
Some RestrictionsNampa City Code § 8-4-7
No person shall discharge or cause to be discharged into the municipal storm drain system or watercourses any materials, including, but not limited to, pollutants or waters containing any pollutants that cause or contribute to a violation of applicable water quality standards. The commencement, conduct or continuance of any illegal discharge to the storm drain system is prohibited except as des...
Erosion Control
Nampa requires a site development/erosion and sediment control permit for any land-disturbing construction activity within city limits; projects uncovering one acre or more must have an approved erosion and sediment control plan before that permit issues.
Nampa grading and drainage permit required
Some RestrictionsNampa City Code § 9-6-4-1
It is unlawful for any person, firm or corporation to perform any construction activity, including, but not limited to, all land disturbing activity, directly or indirectly associated with construction projects within the corporate limits of Nampa without first obtaining a site development and/or erosion and sediment control permit.
Flood Zones
Nampa requires a floodplain development permit before any construction, fill, or land alteration in a mapped special flood hazard area, with violations charged as misdemeanors.
Nampa Floodplain Development Permits
Significant RestrictionsNampa City Code § 4-9-3
A floodplain development permit shall be required prior to development activities in special flood hazard areas established in subsection B of this section... Violations of the provisions of this chapter by failure to comply with any of its requirements... shall constitute a misdemeanor. Any person who violates this chapter or fails to comply with any of its requirements shall upon conviction t...
Flood Elevation Requirements
Nampa requires new and substantially improved residential structures in flood hazard areas to elevate their lowest floor one foot above base flood elevation, the citywide flood protection elevation standard.
Nampa's Flood Protection Elevation Standard
Some RestrictionsNampa City Code § 4-9-5.B.1.a
New construction and substantial improvement of any residential structure shall have the lowest floor, including basement, elevated to the flood protection elevation (FPE).
Looking for Canyon County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Nampa city rules.
Environmental Rules in Canyon County →