An MS4 is a conveyance or system of conveyances that is: ??? Owned by a state, city, town, village, or other public entity that discharges to waters of the U.S.; ??? Designed or used to collect or convey stormwater (including storm drains, pipes, ditches, etc.); ??? Not a combined sewer; and ??? Not part of a Publicly Owned Treatment Works (sewage treatment plant).During Phase I, NDOT was defined