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+ | [[File:IDDE Sample.jpg|right|thumb|alt=This image shows a person collecting a water sample from an outfall |<font size=3>Image of a person collecting a water sample from an outfall </font size>]] | ||
Because our storm sewer systems carry water directly to our lakes, rivers, and wetlands without additional treatment, only clean stormwater should enter a storm sewer system. If any other discharge enters the system, it is usually an illicit discharge. MS4s must develop and implement a program to detect and eliminate illicit discharges within their storm sewer system. | Because our storm sewer systems carry water directly to our lakes, rivers, and wetlands without additional treatment, only clean stormwater should enter a storm sewer system. If any other discharge enters the system, it is usually an illicit discharge. MS4s must develop and implement a program to detect and eliminate illicit discharges within their storm sewer system. | ||
Because our storm sewer systems carry water directly to our lakes, rivers, and wetlands without additional treatment, only clean stormwater should enter a storm sewer system. If any other discharge enters the system, it is usually an illicit discharge. MS4s must develop and implement a program to detect and eliminate illicit discharges within their storm sewer system.