Tesla's Texas lithium refinery accused of discharging carcinogens into public ditch

Drainage workers in Nueces County, Texas stumbled onto an unmarked pipe in January 2026 that turned out to belong to Tesla’s $1 billion spodumene-to-lithium-hydroxide refinery in Robstown, which had been quietly authorized by state regulator TCEQ to discharge up to 231,000 gallons of treated wastewater per day into a ditch feeding Petronila Creek and Baffin Bay. The drainage district that owns the ditch was never notified the permit existed, and TCEQ’s February inspection cleared Tesla on conventional pollutants without testing for heavy metals or lithium itself — the very material the plant was built to process.

An independent 24-hour composite sample analyzed by Eurofins in April detected hexavalent chromium just above the reporting limit, alongside arsenic, strontium, vanadium, manganese, ammonia and abnormally elevated lithium — none of which appear as allowable pollutants in Tesla’s permit. A consulting engineer called the lithium-strontium-vanadium signature a chemical fingerprint of the battery process and warned that elevated salinity is eroding the ditch walls. The drainage district’s attorney sent Tesla a cease-and-desist demanding the company install multi-stage reverse-osmosis treatment.

Tesla disputes the methodology, arguing the lab sampled downstream of the outfall rather than at the regulated discharge point, and maintains it is fully compliant with its TCEQ permit. No legal violation has been alleged. The fight is really about what the permit failed to require, and it lands as Corpus Christi prepares to declare a water emergency amid severe regional drought — undercutting Tesla’s long-running marketing of the refinery as an ‘acid-free clean process.’