Sulphur Creek is an approximately 4.5-mile tributary of Aliso Creek in Orange County, California. The creek drains about 6 square miles in the suburban cities of Laguna Niguel and Laguna Hills. Although most of its watershed has been utilized for master planned residential development, the creek retains a natural channel with riparian and wetland habitat i…Sulphur Creek is an approximately 4.5-mile tributary of Aliso Creek in Orange County, California. The creek drains about 6 square miles in the suburban cities of Laguna Niguel and Laguna Hills. Although most of its watershed has been utilized for master planned residential development, the creek retains a natural channel with riparian and wetland habitat in parts of Laguna Niguel Regional Park and Aliso and Wood Canyons Regional Park. Urban runoff has changed the once seasonal creek into a perennial stream.