Combining the two systems makes

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Challenges with combined sewer systems
In the United States, urban areas prone to stormwater issues often have not only high amounts of impervious surface, but also what is known as a ‘combined sewer’—a single system handling both sewage and stormwater simultaneously. (For more on combined sewer overflows, visit the U.S. Environmental Protection Agency (EPA) page.)

As even small amounts of rain can overtax these kinds of systems, combined sewers can easily send untreated sewage into streams, rivers, and lakes. New York City, having mostly a combined sewer system, can actually experience stormwater overflow issues with as little as 12 mm (½ in.) of cumulative precipitation.

the cost of building the infrastructure cheaper upfront, but at a high cost to rcs data the health of our watersheds. According to some sources, there are more than 800 communities in the United States using this combined system, or about 40 million people (concentrated in the Northeast and Pacific Northwest).

New York City offers an attractive grant program for private property owners in the city’s combined sewer areas. The minimum requirement is to manage 50 mm (1 in.) of stormwater runoff from the contributing impervious area. Previous recipients include the Brooklyn Navy Yard and the New York Restoration Project in the Gowanus Canal watershed.