East Baton Rouge Parish operates a Phase I MS4 permitted by LDEQ under NPDES (LA permit). Title 7 UDC Chapter 15 governs stormwater management, drainage impact studies, and post-construction BMPs. Developments must submit a Stormwater Management Plan and a SWPPP for projects disturbing 1+ acre. The EBR Office of Stormwater Management oversees compliance.
Baton Rouge/EBR Parish operates a Municipal Separate Storm Sewer System (MS4) under LDEQ's NPDES permit program (Louisiana Pollutant Discharge Elimination System). Title 7 (Unified Development Code) Chapter 15 sets stormwater and drainage standards. Developers must submit a Stormwater Management Plan addressing on-site capacity for the 2-, 10-, 25-, and 100-year storm events, and 2021 interim UDC changes added a Stormwater Conveyance Check requirement for Drainage Impact Studies. Construction sites disturbing one or more acres must obtain coverage under LDEQ's Construction General Permit (LAR100000) and prepare a Stormwater Pollution Prevention Plan (SWPPP) with erosion and sediment control BMPs. Post-2016 flood updates have driven additional review of minimum slab elevations and floodplain protections. The EBR Stormwater Master Plan program (https://stormwater.brla.gov/) and the Department of Development administer enforcement. Report illicit discharges to the Stormwater Hotline — confirm current number with EBR Office of Stormwater Management at https://stormwater.brla.gov/.
Discharging pollutants, sediment, or unauthorized non-stormwater into the MS4 violates the parish ordinance and the LDEQ NPDES permit. Failure to obtain Construction General Permit coverage or implement SWPPP BMPs can result in stop-work orders, citations, and LDEQ enforcement penalties.
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