Most cities have two sewer systems: a sanitary sewer and Municipal Separate Storm Sewer System (MS4). The sanitary sewer takes dirty water from our home to the wastewater treatment plant where it is cleaned and released to the North Platte River. The MS4 takes rain and snowmelt straight to the river. That’s why we ask residents to help guard storm drains and the MS4 from chemicals, litter, yard waste or pet waste. When substances other than rain or snow travel in the MS4 they directly pollute the North Platte River, degrading water quality not just for us, but all the way across the state.