Johnston Municipal Water Supply is a large public water system in EPA region 07 that provides tap water for the 50111 zip codes. It has 2 facilities where the water supply was tested for 23 chemical contaminants that impact tap water quality and human health.
The maximum reported level of HAA5 (five regulated haloacetic acids) was 10.9 µg/L. The maximum reported level of Manganese was 2.33 µg/L. The maximum reported level of quinoline was 0.19 µg/L. The only recent water sample showed levels of quinoline that were at or above unsafe concentration levels. There were 3 contamintants found in the Johnston Municipal Water Supply water supply at levels that were above the minimum reporting level. 1 of the contaminants were above the reference level, which means they may pose a risk to human health.
The latest water samples were taken between February 4th, 2020 and November 17th, 2020.