Marijuana may be legal in Colorado, but one town, Hugo, about 100 miles southeast of Denver, doesn’t permit businesses to sell it. However, that doesn’t mean there isn’t any in the town. Officials reported Thursday that the town’s water supply showed evidence of tetrahydrocannabinol, better known as THC — the principal psychoactive chemical in cannabis, CNN reported.

Tests of the water revealed presumptive positive results for the chemical, said Officer Michael Yowell of the Lincoln County Sheriff’s Office.

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Additional tests will be conducted to determine the level of concentration. The Colorado Bureau of Investigation and the FBI are assisting Lincoln County’s investigation.

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There is no confirmation on whether the contamination was deliberate or not, Yowell said. However, there were signs of tampering found on one of the five main wells that supply water to the town of 720 people, according to CNN.

The entire water supply has been contaminated and the well has been closed, according to CNN. Authorities have warned residents to not drink or cook with the water. However, the Colorado Department of Health said it is safe to shower and bathe in the water because the contamination is “short-term exposure.”

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Depending on how much THC is in the water and how much a person drinks, health effects can vary. CNN reported that the worst case scenario is anxiety, impaired coordination, and hallucinations. However, the department does not expect any major health problems because it is a short-term exposure.