Monticello is a large public water system in EPA region 5 that provides tap water for the 55362 zip codes. It has 7 facilities where the water supply was tested for 65 chemical contaminants that impact tap water quality and human health.
The maximum reported level of HAA5 (five regulated haloacetic acids) was 2.883 µg/L. The maximum reported level of Manganese was 872 µg/L. All 4 of the latest water samples showed levels of Manganese that were at or above unsafe concentration levels. There were 2 contamintants found in the Monticello 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 on March 26th, 2025.