The Mississippi Department of Transportation (MDOT) established a Stormwater Management Plan to protect and improve water quality while fulfilling MDOT’s mission of providing and supporting a safe and integrated transportation system that enhances the state.
In 1987, Congress amended the Clean Water Act (CWA) to require implementation, in two phases, of a comprehensive national program for addressing storm water discharges. The first phase of the program, commonly referred to as “Phase I” was promulgated on November 16, 1990, (55 FR 47990). Phase I in 40 CFR Parts 9, 122, 123, and 124 requires National Pollutant Discharge Elimination System (NPDES) permits for storm water discharge from a large number of priority sources including municipal separate storm sewer systems (MS4s) generally serving populations of 100,000 or more and several categories of industrial activity, including construction sites that disturb five or more acres of land. In response to this requirement MDOT developed a Storm Water Pollution Prevention Plan (SWPPP) in October, 1992, which was subsequently approved by the Mississippi Department of Environmental Quality (MDEQ). This document serves as the standard for controlling storm water runoff from MDOT construction sites that disturb more than 5 acres. The Stormwater Phase II Rule
extends coverage of the NPDES stormwater program to certain “small” MS4s but takes a slightly different approach to how the stormwater management program is developed and implemented.
Stormwater is rainfall or melted snow that runs off impervious surfaces, such as rooftops, streets, sidewalks, and parking lots. Impervious, or hard, surfaces prevent the stormwater from naturally soaking into the ground, where the soil would filter out pollutants. As it flows, stormwater picks up pollutants from these surfaces. Common pollutants include vehicle exhaust products, brake and tire dust, oil and grease, sediment, salt, fertilizers and pesticides, pet waste, and litter. Because stormwater is untreated, these pollutants enter our waterways.
Stormwater Interactive Map
Think Green Keep Mississippi Clean
Stormwater / Siltation Problem Form