Environmental Rules in Weber County, UT (2026)
5 rules for unincorporated Weber County, Utah.
Verified from official government sources
Stormwater Management
Weber County bans any illicit discharge into its storm sewer system in the unincorporated county, with narrow exemptions for things like NPDES-permitted discharges, lawn irrigation and firefighting. New construction and redevelopment also need a separate storm sewer discharge permit before work starts.
Weber County Stormwater Discharge Rules
Significant RestrictionsWeber County Code § 40-2-2
It is unlawful for any person to cause or allow an illicit discharge to the storm sewer system. The following discharges to the storm sewer system are exempt from the prohibitions of this section: Discharges regulated under a valid national pollutant discharge elimination system (NPDES) storm discharge permit, provided that the discharge complies with the terms of the permit. Discharges from wa...
Erosion Control
Weber County requires a stormwater construction activity permit before any excavation, grading, or land-disturbing construction in the unincorporated county that disturbs more than 5,000 square feet or moves more than 200 cubic yards of material. The county engineering department reviews the required stormwater pollution prevention plan, and moving dirt before approval is unlawful under Code § 40-3-2.
Weber County Erosion & Sediment Control Permit
Some RestrictionsWeber County Code § 40-3-2
A county stormwater construction activity permit is required before any person or entity may excavate, grub and clear, grade, or perform any type of construction activity that will disrupt or cause a change in the natural landscape upon any of the following types of property located within the unincorporated county: ... Disturbs more than 5,000 square feet of land surface area; Consists of the ...
Flood Zones
Weber County regulates every area FEMA maps as a special flood hazard on its November 30, 2023 Flood Insurance Rate Maps, plus areas with documented flood risk under the county's own best-available data. Any construction, alteration, or land-use change inside a mapped hazard area needs a Floodplain Development Permit before work starts.
Weber County Floodplain Development Permit
Some RestrictionsWeber County Code §§ 22-3-2, 22-3-3
Sec 22-3-2 Basis For Establishing The Areas Of Special Flood Hazard: The areas of special flood hazard identified by FEMA's November 30, 2023 Flood Insurance Rate Maps and Flood Boundary-Floodway Maps (FIRM and FBFM) or Digital Flood Insurance Rate Maps (DFIRM), and other supporting data, are adopted by reference and declared a part of this Title, and any future revisions thereto are hereby ado...
Defensible Space
Weber County's Hillside Development chapter requires building sites on steep terrain to leave ample room for adequate defensible area as defined by the fire code. Any parcel with average slopes of 25 percent or more triggers hillside review before a land use or building permit issues, folding defensible-space planning into that review.
Weber County Hillside Defensible Space Standards
Some RestrictionsWeber County Land Use Code § 108-14-1, § 108-14-3 (Hillside Development Review Procedures and Standards)
In the administration of the provisions of this chapter, the County will strive to achieve the objective of preserving the natural contours of the hillside areas by encouraging and requiring, where necessary, the following: ... Placement of building sites in such a manner as to permit ample room for adequate defensible area as defined by the fire code, landscaping and drainage between and aroun...
Flood Elevation Requirements
New homes and substantially improved residential structures in Weber County's mapped flood hazard areas must have their lowest floor, including any basement, built at least one foot above the base flood elevation. A registered engineer, architect, or land surveyor has to certify the as-built elevation to the Floodplain Administrator before the structure is signed off.
Weber County Base Flood Elevation Freeboard
Some RestrictionsWeber County Code § 22-5-2
Sec 22-5-2 Specific Standards ... Residential Construction: New construction and substantial improvement of any residential structure shall have the lowest floor (including basement) elevated to one foot above the base flood elevation. If a freeboard option is noted, new construction and substantial improvement shall have the lowest floor (including basement) elevated to the freeboard elevation...
All Weber County ordinances
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