According to Durango Herald the Animas River is suitable for normal use. This includes drawing water for city water treatment plant. Stream sediment samples are at pre breach levels, meaning only colored water (think rusty ferrous ion) was released and no solid waste, so says the state and Feds.
Now if the EPA statements are to be believed, why was aggressive remediation occurring in the first place as compared to nothing more than pH control via lime addition and a retention pond? This is common throughout the Rocky Mountains at old mining sites. My guess, contractor was playing around.
There is peace in the Valley, maybe.