Illinois · system IL1635070 · serves 1,863 people · purchased water
This system purchases its water; the band reflects the supplier's most recent reported result within a rolling three-year window. The three-year range below is the supplier's, not this system's own sampling. The water comes from Il American-East St Louis (IL1635040).
The reading
A single reading is not a complete account of what a household drinks, so the three-year range and the number of tests behind it are shown too — a reading backed by many tests over three years is a fuller picture than one from a single sample.
Source: purchased water - values inherited from IL1635040 · Illinois · system IL1635070 · the three years from August 9, 2023 to August 9, 2026
Where this ranks
The water this system purchases sits in the top 7% nationally. Systems reporting less serve about 93% of everyone on NitrateSmart's tracked supply; the other about 7% are on systems reporting the same or more. That compares what systems reported, not what comes out of any one tap.
What "Human impact clear" means
Above 3 mg/L, human activity is the leading explanation for the nitrate in this system's water[1]. It is still a statement about the source, not a health verdict — the level is well below the federal limit.
Sources
The bands describe how strongly human activity, read from nitrate, has marked a water source — they are not a safety verdict. More on what the numbers mean and where nitrate comes from.
Nitrate in community water systems, from the utilities’ own compliance reporting.
Results reaching back to July 2023 · current through August 9, 2026.
Educational information, not medical or personal safety advice.