SUPERIOR, Colo. -- Residents in Superior are concerned about their drinking water after they received a warning notice with their bills.

The notice said the water supply did not meet treatment requirements.

The state health department said the water is safe to drink. The Health Department said the water is not contaminated but did have elevated levels of organic carbon.

They said the drinking water contains material produced by decaying vegetation, microorganisms and soil erosion, and that caused the levels of organic carbon to reach 2.3 milligrams-per-liter, which is above the standard of 2.0 milligrams-per-liter.

The notice told residents that the elevated levels of organic carbon is not an emergency. It also said if residents have specific health concerns they should contact a physician.

"We drink tap water. We don't drink water from the fridge or bottled water," said Superior resident Erin Gonzales.

Gonzales said she can't help but be concerned because the notice was difficult to understand.

"I don't feel the notice was a good explanation for those who don't work for a water company and have an understanding of what those terms are," said Gonzales.

She said she is also concerned because the violation occurred Sept. 14, but residents didn't receive the notice until Nov. 10.

"I would feel better if we had a better idea of what symptoms would be if something significant was to happen," said Gonzales.

7NEWS contacted public works officials in Superior and they directed us to their contractor, Eco Resources. Eco Resources then directed 7NEWS to the state health department.

The health department said people are not being asked to boil their water or buy bottled water. Government regulations require a notification to be sent to residents when treatment levels or certain solids in the water are above normal. So, even though the water is safe to drink, the health department said the notices are part of the process.