Environmental Rules in Flagstaff, AZ (2026)
4 verified environmental rules for Flagstaff, Arizona, sourced directly from the municipal code and official government pages.
Verified from official government sources
Stormwater Management
In the City of Flagstaff, every property owner and developer must provide, maintain and operate on-site stormwater systems that safely collect, convey, detain and discharge runoff. The Stormwater Management Utility enforces this duty as a nuisance action when a site fails to comply, and City crews can enter and fix the problem at the owner's expense.
Flagstaff On-Site Stormwater System Requirements
Some RestrictionsFlagstaff City Code § 12-02-001-0007(a)
(a) All property owners and developers of real property to be developed within the City of Flagstaff shall provide, manage, maintain, and operate on-site stormwater systems and facilities sufficient to collect, convey, detain, control, and discharge stormwater in a safe manner consistent with all City development regulations and the laws of the State of Arizona and the United States of Ameri...
Erosion Control
In the City of Flagstaff, any developer disturbing land must stabilize the site, file the required stormwater pollution prevention paperwork, and, on cut or fill slopes steeper than 2:1, prove the slope is stable through a geotechnical study or add rigid erosion protection before the City Engineer signs off.
Flagstaff Construction Erosion and Sediment Control
Some RestrictionsFlagstaff City Code §§ 13-10-009-0001(4), 13-17-001
4. All publicly and privately constructed cut and fill slopes shall be adequately protected to prevent erosion. Cut and fill slopes greater than two (2) horizontal to one (1) vertical shall not be permitted unless the slope is determined to be stable as demonstrated by a quantitative geotechnical analysis prepared by a registered geologist or other qualified registrant. Slopes of two (2) horizo...
Flood Zones
In the City of Flagstaff, Chapter 12-01's floodplain regulations apply citywide and extend to any land the City later annexes, and they require a floodplain use permit before any construction, fill, or land-use change in a special flood hazard area. The regulatory floodway itself bans nearly all new fill, buildings and storage unless a FEMA map revision removes the area first.
Flagstaff Floodplain and Floodway Development Rules
Significant RestrictionsFlagstaff City Code §§ 12-01-001-0004.01, 12-01-001-0006.7(A)
A. These regulations shall apply to all areas within the corporate limits of the City of Flagstaff, Arizona, including special flood hazard areas and administrative floodplains. ... The following are prohibited in, on, or over the regulatory floodway unless removed by a FEMA map revision: Encroachments, including fill, new construction, additions to existing structures which increase the buildi...
Flood Elevation Requirements
In the City of Flagstaff, the Regulatory Flood Elevation sets construction one foot above the base flood elevation, the freeboard the Floodplain Administrator enforces citywide. New, substantially improved, or substantially damaged residential structures in Zones AE and AH must have their lowest floor, including any basement, and all attached mechanical equipment built at or above that regulatory flood elevation, and floodproofing cannot substitute for elevation on new homes.
Flagstaff's 1-Foot Freeboard Above Base Flood Elevation
Some RestrictionsFlagstaff City Code §§ 12-01-001-0003, 12-01-001-0006.1(A)(3)(a)
"Regulatory flood elevation (RFE)" means an elevation one (1) foot above the base flood elevation for a watercourse for which the base flood elevation has been determined and shall be as determined by the criteria developed by the Director of the Arizona Department of Water Resources for all other watercourses. ... All new and substantially improved or substantially damaged residential structur...
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County ordinances apply to unincorporated areas and may supplement Flagstaff city rules.
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