A Tesla lithium refinery in Texas has been discharging 231,000 gallons of polluted wastewater per day into a drainage ditch, which was discovered by a local drainage district during a routine inspection. The wastewater contains hexavalent chromium, arsenic, and other pollutants, prompting concerns about the environmental impact. Tesla claims to be in compliance with its state-issued wastewater discharge permit, but the drainage district has raised questions about the permit's requirements and the company's testing methods. The incident has sparked a debate about the definition of 'clean lithium' and the regulation of industrial wastewater.