A required notice sent to the city of Ouray’s roughly 800 water customers about possible sources of contamination triggered panic and more questions from some residents on Wednesday.

But there’s nothing to panic about. There is no evidence of contamination. There’s no need to boil water The notification was spurred by a requirement to notify customers that six water accounts had not installed backflow-prevention devices within a izo-day deadline.

The letter, required by the Colorado Departme...