Environmental Rules in Bannock County, ID (2026)
4 rules for unincorporated Bannock County, Idaho.
Verified from official government sources
Stormwater Management
In unincorporated Bannock County, new development cannot increase peak stormwater flow onto downstream neighbors beyond what the land would have produced in its natural, undeveloped state. The county engineer or building official inspects drainage facilities during construction, and noncompliant projects face suspended building permits or enforcement under the zoning code's penalty section.
Stormwater Runoff Rules in Bannock County
Some RestrictionsBannock County Code § 17.52.540
A.On-Site Detention and Limitation of Stormwater Runoff. No development shall cause downstream property owners, watercourses, channels or conduits to receive stormwater runoff from proposed developments at a higher peak flow rate than would have resulted from the same storm event occurring over the site of the proposed development with the land in its natural, undeveloped condition.B.Inspection...
Erosion Control
Before Bannock County will approve a conditional use permit on land with an average slope over 10 percent, the applicant must submit a grading plan showing existing and proposed topography along with specific erosion control measures. Planning and Development Services reviews the plan as part of the standard conditional use application.
Erosion Control Rules in Bannock County
Some RestrictionsBannock County Code § 17.56.380(E)(6)
6.For sites with an average slope greater than ten percent, a plan showing existing and proposed topography and grading and proposed erosion control measures,
Flood Zones
In unincorporated Bannock County, any development activity within a special flood hazard area requires a floodplain development permit before work begins. Chapter 14.04 of the Bannock County Municipal Code, the county's Flood Damage Prevention Ordinance, applies countywide to those mapped flood zones and is administered by the Planning and Development Services floodplain administrator.
Floodplain Development Permit Required in Bannock County
Some RestrictionsBannock County Code §§ 14.04.070, 14.04.090, 14.04.140
This chapter shall apply to all special flood hazard areas within the jurisdiction of Bannock County, Idaho. Nothing in this chapter is intended to allow uses or structures that are otherwise prohibited by the zoning ordinance. ... A floodplain development permit shall be required in conformance with the provisions of this chapter prior to the commencement of any development activities within s...
Flood Elevation Requirements
In unincorporated Bannock County, new residential construction in a mapped flood hazard area must have its lowest floor built at or above the flood protection elevation, which the code defines as the base flood elevation plus two feet of freeboard. Sections 14.04.060 and 14.04.210(A) of the Flood Damage Prevention Ordinance set the standard.
Bannock County Requires 2-Foot Flood Freeboard
Some RestrictionsBannock County Code §§ 14.04.060, 14.04.210(A)
"Flood protection elevation (FPE)" means the base flood elevation plus the freeboard. 1.In "special flood hazard areas" where base flood elevations (BFEs) have been determined, this elevation shall be the BFE plus 2.0 feet of freeboard; and2.In "special flood hazard areas" where no BFE has been established, this elevation shall be at least 2.0 feet above the highest adjacent grade. ... A.Reside...
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