A wastewater facility in Port Arthur operated by one of the largest chemical product producers in North America is responsible for the single biggest wastewater spill during Hurricane Harvey, releasing more than 100 million gallons, state records show. The release at the Port Arthur facility run by BASF TOTAL Petrochemicals did not harm the environment, company spokesman Bob Nelson said in a written statement. "Our process water systems were not compromised - no process chemicals in the water," Nelson said in an email.