Legal Authorities

The 2016 MS4 general permit requires municipalities to pass several 'legal authorities' which could be ordinances, bylaws, regulations, standard conditions of approval or other appropriate legal authorities. Generally, the three legal authorities in the permit are: to prohibit and eliminate illicit discharges, to require low impact development be considered before other practices for managing stormwater runoff, and to require and inspect stormwater runoff control practices at construction sites.


Although the 2004 MS4 general permit previously required towns to establish the legal authority to prohibit illicit discharges to the stormwater system, additional requirements were added to the updated permit. NEMO is developing a sample ordinance to comply with the new requirements highlighted and will post it here when available.