Louisiana Stormwater-Municipalities regulations & environmental compliance analysis

Louisiana Stormwater-Municipalities: What you need to know

Governing Law and Regulations

Louisiana Pollutant Discharge Elimination System (LPDES) permit program: Louisiana Administrative Code (LAC) 33:IX.2301 to 33:IX.7129

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Municipal separate storm sewer systems (MS4s): LAC 33:IX.2517 to 33:IX.2529

Municipalities: LAC 33:IX.2511.B.16

Regulatory Agencies

Louisiana Department of Environmental Quality (DEQ)Water Permits Division

U.S. Environmental Protection Agency (EPA)Region 6

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Louisiana is authorized to administer the National Pollutant Discharge Elimination System (NPDES) permit program (known in Louisiana as the Louisiana Pollutant Discharge Elimination System (LPDES) permit program), including stormwater general permit authority for municipal separate storm sewer systems (MS4s). State-specific provisions that were added to the baseline federal general permit include annual and semiannual monitoring requirements. See the national section STORMWATER—MUNICIPALITIES to review the federal requirements.

Administration and enforcement. DEQ's Water Permits Division is responsible for the administration and enforcement of the state's LPDES MS4 stormwater permit program.

State Requirements


LAC 33:IX.2511.B.16

Louisiana requires large, medium, and small MS4s to be covered by an LPDES stormwater permit. The MS4 systems that are required to obtain permit coverage include:

  • In urbanized areas (UAs), all core cities, plus any other MS4s operating within the UA unless specifically waived by the Louisiana Department of Environmental Quality (DEQ).
  • Outside UAs, MS4s serving populations of 10,000 to ...

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