Human waste, pet waste and other contamination should NEVER go into a stormwater drain.

Whatever contaminants enter a stormwater system will eventually reach source water, which can poison fish, birds, and other wildlife and harm drinking water supplies.

Storm drains collect rainwater and runoff from streets and roofs, carrying it untreated to local waterways.

Stormwater systems can include catch basins, gutters, channels, pipes and tunnels. The most important thing to understand is that they do not transport water to a water treatment facility. Instead, the stormwater is directed directly to a water source, such as a creek, stream, river, lake, or pond, which is often part of a local drinking water system. This is why it is so important to treat stormwater sewer systems and sanitary sewer systems differently.

Storm drain cleaning is a critical maintenance process that removes accumulated sediment, leaves, debris, and trash from catch basins and pipes to prevent street flooding and water contamination. 

Cleaning can be done with a High-Pressure Jetting Rodding.
This method uses pressurized water to blast through debris, roots, and grease inside the drain pipes. 

The primary function of storm sewer systems is to safely collect and transport stormwater—including rain, snowmelt, and hail—from impervious surfaces like roads, roofs, and parking lots directly into nearby bodies of water (rivers, lakes, streams) to prevent urban flooding.