The Midland City Council wants to know what's in the water.
A routine water well check on the T-Bar Ranch in Winkler and Loving counties, revealed one of the wells supplying some of Midland's water had high levels of chloride.
The Railroad Commissioner is looking into the contamination.
So far, they've narrowed down the location and source of the contamination.
As for figuring out how it happened, officials haven't released that information.