A woman in Texas says she was infected with an incurable sexually transmitted disease (STD) after a janitor tainted water bottles at her office by “rinsing his penis in the water”.

Lucio Diaz, 50, who was caught committing the heinous act has been charged with indecent assault and aggravated assault with a deadly weapon.

“This individual is a sick man,” said the 54-year-old married mother of two. She did not want to be identified.

The woman disclosed that in August she decided to drink only from water bottles that she brought to work after she noticed a foul smell coming from the employee water dispenser at the doctor’s office where she worked.

However, the victim said in late September, she thought her own water bottle had been tainted with urine.

Court records show a urinalysis confirmed it. But it was the spy camera that she bought that left no questions, she said.

“Pulls out his penis and puts his penis in my bottle, basically rinses his penis in the water,” she explained.

Further testing brought devastating news to the middle-aged woman.

“I learned I acquired an STD for which he also tested positive for,” she said. “He gave me an STD I will have for the rest of my life. Nothing is going to change it. Nothing will make it better for me. In fact, I feel like, for the rest of my life, I will have to be careful.”

Court records show Diaz is in Immigration and Customs Enforcement custody. The Mexican national’s immigration and work status are unclear. The victim said Diaz continued to work at the building even after management was notified, and is working with an attorney in relation to the incident.

Investigators with the Houston Police Department’s Major Offenders Division believe more people have been infected and say Diaz could face more charges.

“I want this to go to trial. I want him to be exposed for who he is, and I want him to pay for what he’s done to me and then be deported,” the victim said.