Only Rain in the Storm Drain
Did you know that Flagstaff's storm drain system and sewer system are separate? What goes down the storm drain is not treated at a treatment plant, but flows untreated into the Rio de Flag. Help us protect our local waterways by preventing stormwater pollution. Hazardous Household Waste, including automobile oil, can be disposed of at the Flagstaff Hazardous Products Center (HPC).
Enjoy this video and remember: Only Rain in the Storm Drain!
Another way you can protect our Watershed!
Construction Debris Down the Storm Drain
Small Municipal Separate Storm Sewer System General Permit
The City of Flagstaff encourages residents to view the small MS4 general permit and the NOI. Public comments are due to ADEQ by Email or mail (must be postmarked or received) by May 20, 2017. A link to the public notice on ADEQ's webpage is
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.
Stormwater Credit Manual
Application (click here)
Register for a myDEQ Account
How to file an Notice Of Intent (NOI) Guidance Document
myDEQ Video: Migrating or Creating NOI (CGP)
myDEQ Video: Terminating an NOI (CGP)
2013 Construction General Permit (ADEQ)
Construction General Permit (CGP) Inspection Form
Frequently Asked Questions (CGP)
Notice of Intent (NOI) Fillable Form
Erosion Control Plan for SFH
Floodplain InformationLink to page
Document downloads including design manuals, regulations, SWPPP forms, etc.Link to page
NPDESLink to page
LID - Low Impact DevelopmentLink to page
Projects the Stormwater Team are currently working onLink to page
Meet the Team of Flagstaff StormwaterLink to page
Monsoon/Flooding PreparednessLink to page