Tap Water Quality Report
Tap water quality in DECATUR, Illinois
Tap water in DECATUR, Illinois receives a grade of D (65/100) from TapWaterSafety.org. It's served by DECATUR. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Bromodichloromethane significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in DECATUR's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving DECATUR.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 21.1 ppb, 352x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 44.7 ppb, 298x above the EWG health guideline of 0.15 ppb.
Bromodichloromethane significantly above health guideline
Moderate concernBromodichloromethane detected at 8.86 ppb, 148x above the EWG health guideline of 0.06 ppb.
Recommended filters for DECATUR
Filters matched to the specific contaminants in DECATUR's water supply.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
All contaminants detected in DECATUR's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
21.1 ppb | 0.06 | — | — | — | — | — | 352× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
44.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 298× over |
| Bromodichloromethane Disinfection byproduct |
8.86 ppb | 0.06 | — | — | — | — | — | 148× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
13.3 ppb | 0.1 | 60.0 | 60 | — | — | — | 133× over |
| Chromium (hexavalent) Heavy metal |
1.77 ppb | 0.02 | — | — | — | — | — | 89× over |
| Chloroform Disinfection byproduct |
32.2 ppb | 0.4 | — | — | — | — | — | 81× over |
| Dichloroacetic acid Disinfection byproduct |
9.64 ppb | 0.2 | — | — | — | — | — | 48× over |
| Dibromochloromethane Disinfection byproduct |
3.51 ppb | 0.1 | — | — | — | — | — | 35× over |
| Dibromoacetic acid Disinfection byproduct |
0.684 ppb | 0.03 | — | — | — | — | — | 23× over |
| Trichloroacetic acid Disinfection byproduct |
2.13 ppb | 0.1 | — | — | — | — | — | 21× over |
| Nitrate Inorganic |
2.56 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 18× over |
| Chlorite Disinfection byproduct |
484.2 ppb | 50.0 | 1000.0 | — | — | — | — | 9.7× over |
| Chlorate Disinfection byproduct |
141.2 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Atrazine Pesticide/Herbicide |
0.0467 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.128 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Vanadium Other |
1.05 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Monobromoacetic acid Disinfection byproduct |
0.694 ppb | 25.0 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
6.13 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.261 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Aluminum Heavy metal |
3.67 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Monochloroacetic acid Disinfection byproduct |
0.111 ppb | 53.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
0.385 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.0388 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chlorodifluoromethane Other |
0.068 ppb | — | — | — | — | — | — | Below guideline |
| Dicamba Other |
0.32 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.712 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from DECATUR.