What is a Municipal Separate Storm Sewer System (MS4)? | City of Findlay, Ohio

What is a Municipal Separate Storm Sewer System (MS4)?

The regulatory definition of an MS4 (40 CFR 122.26(b) (8) is a “conveyance or system of conveyances(including roads with drainage systems, municipal streets, catch basins, curbs, gutters, ditches, man-made channels, or storm drains): (i) Owned or operated by a state, city, town, borough, county, parish, district, association, or public body created to or pursuant to state law) including special districts under state law such as a sewer district, flood control district or drainage district, or similar entity, or an Indian tribe or an authorized Indian tribal organization, or designated and approved management agency under section 208 of the Clean Water Act that discharges into waters of the United States. (ii) Designed or used for collecting or conveying storm water: (iii) Which is not combined sewer: and (iv) Which is not part of a Publicly Owned Treatment Works (POTW) as defined in 40 CFR 122.2.”

in Utilities – Storm Water