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A municipal separate storm sewer system (MS4) is a publicly-owned conveyance or system of conveyances (including but not limited to streets, ditches, catch basins, curbs, gutters, and storm drains) that is designed or used for collecting or conveying stormwater and that discharges to surface waters of the State.

Rather than being absorbed naturally into the ground, much of New York City's stormwater eventually flows into storm drains or catch basins, and from there into the Sewer System. We oversee a broad citywide effort to better manage stormwater to improve the health of our local waterways and prevent flooding.

Explore MS4_TypeCountyUrban_Name Phase I Richland Columbia, SC Phase II Darlington Florence, SC Phase II Florence Florence, SC Phase I Greenville Greenville, SC21 more rows

The Municipal Separate Storm Sewer System (MS4) General Permit: for most cities and towns in Massachusetts, to operate municipal stormwater systems.

The goal of a SWPPP is to protect the quality of the City's drinking water supply by preventing erosion and sedimentation during construction, and by ensuring that pollutants in stormwater discharges are minimized, and that the rate and quantity of post-construction stormwater runoff are reduced or properly managed.

The Industrial General Permit regulates industrial storm water discharges and authorized non-storm water discharges from industrial facilities in California.

Before commencing construction activity, the owner or operator of a construction project that will involve soil disturbance of one or more acres must obtain coverage under the State Pollutant Discharge Elimination System (SPDES) General Permit for Stormwater Discharges from Construction Activity, informally known as ...