Certain areas within Coconino County are designated and listed as comprising the County SMS4. This was done because they are physically interconnected with the city of Flagstaff UA and/or measurably contributing to pollutant loadings in the common receiving streams. Maps of the affected subdivisions that are subject to the Construction General Permit are as follows:
Coconino County as operators of the SMS4s is required to develop and implement a Stormwater Management Program (SWMP). This requirement commits the County to meeting minimum control measures through enforcing and developing best management practices to reduce the physical and chemical pollution from stormwater runoff. To accomplish the enforcement of three of the control measures, the County adopted a Stormwater Ordinance.
Two of the other control measures involve public education and public involvement. The SWMP also addresses the following: