After 700 residents of a small Colorado farming town were warned a few days ago not to drink the water because some samples tested positive for THC, the scare is over.

Lab testing showed there was no THC — the principal psychoactive chemical in cannabis — in the water supply in Hugo, Colorado, the Lincoln County Sheriff’s Office said Saturday, as CNN and other news outlets noted.

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“We are happy to announce that the water advisory is canceled immediately,” the sheriff’s department said.

No one had reported being sick or impaired from drinking the water earlier, officials said at a news conference on Thursday evening. The possible contamination was discovered after an employer there, doing random drug tests, continued getting inconsistent results for THC, the Denver Post reported several days ago. The company decided to test a vial of tap water, expecting it to be negative. They called authorities when it wasn’t.

Question of the day: Now that the water’s been cleared, why did investigators think THC was in the water in the first place?

A company in town was testing workers for drugs with a field-testing kit while noting some discrepancies in the results, as CNN reported. The field kit then indicated the tap water was positive for THC. The company told the public works department, which then used field tests throughout the water system and found THC-positive results in one of the town’s five water wells, as well as in other locations. The mystery deepened when workers found evidence that the well with the positive result had been broken into — and that led to a full investigation.

“The Colorado Bureau of Investigation was called to collect samples for laboratory tests on Thursday,” a CNN article said. “Health officials said no one had complained of adverse symptoms from drinking the water, but they issued the advisory out of caution, saying short-term ingestion could impair coordination and increase anxiety and paranoia in the worst case. In the end, the lab tests were negative — and investigators believe the field test results were false, the sheriff’s department said.”

But the break-in at the well still remains to be solved.

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