Reference Number: CTAS-556
Storm Water Phase I regulations were promulgated by the EPA in 1990. Phase I uses a permit system set up under the NPDES to regulate storm water discharges from three sources:
- Medium and large municipal separate storm sewer systems (MS4s) serving populations of 100,000 or greater;
- Construction activity disturbing five acres of land or more; and
- Ten categories of industrial activity.