… For almost 40 years in the middle of the 20th century, workers at an oil refinery with connected facilities in Wilmington and Carson buried truckloads of slop oil and acid sludge directly on site. Decades later, much of that waste is still in the soil and water table, state records show. Phillips 66, which  now owns the century-old refinery, will idle the plants by the end of the year. …  Among the pollutants in the groundwater under the Carson and Wilmington facilities, overseen by the Los Angeles Regional Water Quality Control Board, are lead from buried waste and dangerous levels of per- and polyfluoroalkyl substances (PFAS) from foam used to fight fires at the refinery. 

Other water pollution and treatment news:

• The Conversation: Blog: Colorado’s subalpine wetlands may be producing a toxic form of mercury – that’s a concern for downstream water supplies
• The Signal (Santa Clarita, Calif.): SCV Water to build new PFAS treatment facility