Storm drainage systems include items such as pipes, street/curb inlets, ponds, and even natural channels. Municipal stormwater drainage systems are sometimes referred to as Municipal Separate Storm Sewer Systems (MS4's). These systems are monitored by the National Pollutant Discharge Elimination System (NPDES), which is controlled by the Environmental Protection Agency (EPA). The EPA set up the NPDES as part of the Federal Clean Water Act (CWA). The City of Evans falls under what is referred to as the Stormwater Phase II portion of this legislation. The Stormwater Phase II program requires the City of Evans to establish and maintain six minimum control measures for our MS4. These measures help keep the City in compliance with all the regulations of the before mentioned programs. The six minimum control measures are listed at the bottom of the page.
The major outfall for the City of Evans is the South Platte River. There are other municipalities and individuals downstream from the City of Evans that depend on the South Platte River for their public drinking water and irrigation. In order to help increase the quality of the stormwater that the City of Evans releases into the South Platte River, we need help from the citizens. Property owners should make a conscious effort to store and dispose of waste such as motor oil, anti-freeze, and other hazardous materials properly. We can also help by reducing our dependency on lawn fertilizers, pesticides, and herbicides. Another major contributor to stormwater pollution is sediment. Most sediment comes from erosion of un-vegetated land such as that found on construction sites.
