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Stormwater Management
Welcome to the City of Flagstaff Stormwater Management website. The
mission of the stormwater section is to promote public health,
safety, and general welfare, to minimize public and private
losses due to flood conditions within the City of Flagstaff, and to comply with the applicable floodplain and stormwater regulations.
 Mountains


New Requirements for certain single family Building Permits

Effective January 1, 2015 the Arizona Department of Environmental Quality (ADEQ) will require a Stormwater Construction General Permit (2013 CGP) for certain single family residential units and subdivision infill projects. (See complete list of affected subdivisions in the Fact Sheet link provided below).

Requirements per ADEQ
: Construction sites that disturb less than one acre, but are part of a common plan of development or sale that will ultimately disturb one acre or more need CGP coverage. It includes all clearing, grading, excavation, and stockpiling activities that will result in the disturbance of one or more acres. It also includes supporting activities such as storage of construction materials, vehicle and equipment storage and maintenance (e.g., fill piles, borrow area, concrete truck washout, fueling).

This permit is a requirement of the Clean Water Act and administered by the City of Flagstaff in conjunction with the Arizona Department of Environmental Quality (ADEQ). It is a part of the National Pollutant Discharge Elimination System (NPDES) focusing on point source pollutants associated with stormwater runoff.

Links to useful documents and guidelines are below:

Fact Sheet

2013 Construction General Permit (ADEQ)

Construction General Permit (CGP) Inspection Form

Frequently Asked Questions (CGP)

Notice of Intent (NOI) Fillable Form







Stormwater Management - View All
Mt. Elden Flooding Fact Sheet  - Mt Elden flooding of July 8, 2014 near the Shadow Mountain and Swiss Manor Neighborhoods Fact Sheet Read on...

Shadow Mountain & Swiss Manor Site Assessment  - On July 28, 2014, NRCS staff, U.S. Forest Service hydrologists Read on...


Flagstaff City Hall, 211 West Aspen Ave., Flagstaff, AZ 86001, Phone: (928) 213-2000