The Class II permit is needed to control stormwater discharge to any surface water in Miami-Dade County.

At a minimum, the first inch of rainfall that is not absorbed by the ground is required to be retained on site, prior to discharge.  Studies have shown this first inch is where 90% of the pollution is picked up by rainfall runoff. 

If the applicant indicates that they cannot reasonably contain the whole storm event on site, even after retaining the first inch, the County will then allow a discharge to a body of water. 

The Class II permit will require further treatment of the stormwater runoff before discharge to the water body.

To control the pollution inherent in stormwater runoff.

Zoning approval from a local municipality or the Miami-Dade County (if you are in unincorporated Miami-Dade) is required prior to construction activity.

Depending on the type, size, and location of development and/or construction, a DERM Class I or IV permit might be needed, as well as a District Right-of-Way permit, and a Surface Water Management General Permit or Environmental Resources Permit (ERP). Each project is reviewed on its own merits as far as other permits being needed.

This question is intended to give you an idea of what other permits may be needed. Depending on your situation, you may need one or more of the above-mentioned permits. Additionally, there may be instances when a permit that is not listed here is required. We encourage you to call the contact number at the bottom of this page to discuss your particular case or to receive additional information.

Approximately thirty (30) days.

Please see DERM Fee Schedule.

For one (1) year and it is renewable annually. For more information, please call 305-372-6681.

• View the Class II Permit 

Those requiring a time extension for a Class II, Class III, Class V or Class VI permit need to submit the following application 30 days before the permit expires. For more information, please call 305-372-6681.

• View the Time Extension Application