In 1998, a coalition of 13 Lower Rio Grande Valley (LRGV) local governments joined to form the LRGV TPDES (Texas Pollutant Discharge Elimination System) Stormwater Task Force (Task Force) in a joint effort to develop a regional approach to comply with the TPDES Phase II Municipal Separate Stormwater Sewer System (MS4) rules. The Task Force developed a regional stormwater management plan (SWMP) adopted by the membership. Today, the Task Force comprises 23 MS4 local governments sharing one regional SWMP and ten (10) more members. The primary goal of the Task Force project in 1998 was to develop and implement a regional SWMP to comply with Phase II regulations. This session will cover how the Task Force has evolved since then, including updating its mission to include stormwater quality management approaches to address broader water quality and watershed issues; transitioning to RATES/RGV; and becoming a non-profit organization in 2022.