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Water Quality Report

Decatur, IL

Macon County · 86,136 residents · 5 water systems

10

Contaminants detected

0

PFAS compounds

110

Hardness (mg/L)

0

Above legal limits

3

Above health guidelines

Decatur drinking water comes from a mix of groundwater and surface water sources. Based on the most recent monitoring data, 10 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Total Trihalomethanes, and 6 others. PFAS testing has been conducted with no detections. Water hardness is 110 mg/L (moderately hard), which is within a typical range for the region.

Contaminants detected in Decatur water

Detection does not necessarily mean unsafe levels. See individual reports for concentrations and EPA limits.

Lead0.0026 / 0.015 mg/L
17% of EPA limit
Nitrate1.8 / 10 mg/L
18% of EPA limit
Copper5.2 / 1300 ug/L
0% of EPA limit
Total Trihalomethanes63.8 / 80 ug/L
80% of EPA limit
Haloacetic Acids (HAA5)16.1 / 60 ug/L
27% of EPA limit
Atrazine0.11 / 3 ug/L
4% of EPA limit
Dicamba0.71 ug/L
UnregulatedPesticide
Barium0.0061 / 2 mg/L
0% of EPA limit
Fluoride0.802 / 4 mg/L
20% of EPA limit
Toc5.3 mg/L
Unregulated
PFAS (tested — none detected)
Microplastics (not routinely tested)

Water systems serving Decatur

DECATUR

76,122 servedSurface water10 contaminants1 above guideline
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LONG CREEK TOWNSHIP PWS

7,850 servedGroundwater9 contaminants2 above guidelines
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HARRISTOWN

1,320 servedGroundwater3 contaminants
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MISSISSIPPI MANUFACTURED HOME COMMUNITY

503 servedSurface water2 contaminants
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DECATUR CORRECTIONAL CENTER

341 servedSurface water0 contaminants
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Other cities in Macon County

Water quality reports for nearby Illinois communities.

ArgentaBoodyCedaredgeDieterichForsythMaconMaroaMount ZionMoweaquaWarrensburg

Frequently asked questions

Is Decatur, IL tap water safe to drink?
Decatur tap water meets EPA legal standards (Maximum Contaminant Levels). However, 3 contaminants are present above independent health guidelines, which are often stricter than legal limits. 10 contaminants have been detected in the water supply, including Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5). View the detailed report for each water system to see specific levels and how they compare to both legal limits and health guidelines.
What contaminants are in Decatur water?
Monitoring has detected 10 contaminants in Decatur's water supply: Lead, Nitrate, Copper, Total Trihalomethanes, Haloacetic Acids (HAA5), Atrazine, Dicamba, Barium, Fluoride, Toc. 3 exceed health guidelines. See individual system reports for concentrations relative to EPA limits.
Does Decatur water have PFAS?
Decatur's water has been tested for PFAS compounds with no detections. Testing was conducted as part of the EPA's Unregulated Contaminant Monitoring Rule (UCMR5) program.
Where does Decatur get its drinking water?
Decatur's drinking water comes from a combination of groundwater and surface water sources. The water is treated and tested according to Illinois EPA and EPA requirements before distribution. Decatur is served by 5 water systems, the largest being DECATUR (serving 76,122 people).

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