MS4 Permit

A municipal separate storm sewer system, commonly called an MS4, is a conveyance or system of conveyances, such as roads with drainage systems, municipal streets, catch basins, curbs, gutters, constructed channels or storm drains, owned or operated by a governmental entity that discharges to waters of the state. Municipalities that need to obtain an MS4 permit are classified as either a "Phase I" or "Phase II" MS4. Phase I MS4s cover areas with populations greater than 100,000 (large and medium) while regulated Phase II (small) MS4s serve populations less than 100,000 and are located within a Census Bureau designated "urbanized area" (UA). Federal regulations also provide the EPA and the states the discretion to require other MS4s outside of UAs to apply for a permit. 

Millersburg’s coverage under the Phase II MS4 General Permit began in June of 2021.  Information on the MS4 program can be found on Oregon DEQ’s website here: https://www.oregon.gov/deq/wq/wqpermits/Pages/MS4-Permits.aspx

A interactive map of Millersburg’s MS4 conveyance system can be found here: https://hubcitygis.cityofalbany.net/infohub/