A Calallen man says a leaking truck dumped sludge on his property. The company calls it accidental as city and state investigate.

CORPUS CHRISTI, Texas — A Calallen homeowner says he returned home one night in March to find a truck leaking a dark, sludge-like substance onto his property, sparking an ongoing investigation by local and state officials.

RELATED: New 25-acre retail development planned in Calallen with Academy, LongHorn Steakhouse, Olive Garden

Daniel Mahaffey told Corpus Christi Public Works and 3NEWS that he discovered the truck actively releasing material on his property off Interstate 37, leaving what he described as a large pile and trail of the substance.

“I was coming home from work, found the truck actively disposing of the material … and a massive trail of this material leading to a giant, approximately one-ton pile of it on my property,” Mahaffey said.

Mahaffey took photos of the incident, which he believes show a truck operated by Laredo-based Precision Group Energy Services. He also alleges the driver left the scene, prompting Mahaffey to follow the vehicle roughly two miles to an area near a Walmart off Highway 77.

A vice president for the company, Harold Godinez, described the situation as “a series of unfortunate events,” saying the driver noticed cargo leaking from the truck, pulled over, and accidentally spilled the material.

The driver later stopped at the Walmart to purchase cables to secure the truck’s latch, according to the company.

Mahaffey said he was initially told the substance may have been fracking fluid, a claim he said was supported by individuals he spoke with at city public works. However, Precision Group Energy Services later told 3NEWS the material was non-harmful.

Officials with the Texas Commission on Environmental Quality and the City of Corpus Christi explicitly refused to comment on the situation, citing an ongoing investigation.

Mahaffey said he is concerned the material may have been dumped in multiple locations and worries about potential environmental impacts.

“There’s a good chance those weren’t the only dump sites,” he said. “Based on the size of the truck, there’s unaccounted material.”

Precision Group Energy Services said it is cooperating with investigators and has already excavated the affected areas on Mahaffey’s property and near the Walmart location.

The investigation remains ongoing.