A Stockton man will serve prison time following his conviction stemming from an illegal petroleum dumping case in which approximately 280 gallons of oil product was dumped into a waterway near the Smith Canal in Stockton.
David Andrew Sump was sentenced to six years in prison by a San Joaquin County Superior Court Judge on Monday, March 23, 2026. Sump’s prior criminal record was factored into the sentence. An investigation by CDFW’s Law Enforcement Division, with assistance from the Stockton Police Department and the San Joaquin County Sheriff’s Department, connected Sump to the incident, which took place on Sept. 27, 2024.
The incident triggered a multi-agency response that included CDFW’s Office of Spill Prevention and Response (CDFW-OSPR), the U.S. Coast Guard and U.S. Environmental Protection Agency, Stockton Fire Department and other agencies. Cleanup contractors eventually removed the oil product from the waterway and nearby soil…