Tap Water Quality Report
Tap water quality in JOLIET, Illinois
Tap water in JOLIET, Illinois receives a grade of C (75/100) from TapWaterSafety.org. It's served by JOLIET. The most significant water quality concerns are: Arsenic significantly above health guideline; Radium, combined (-226 and -228) significantly above health guideline. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in JOLIET's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving JOLIET.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 1.06 ppb, 266x above the EWG health guideline of 0.004 ppb.
Radium, combined (-226 and -228) significantly above health guideline
Moderate concernRadium, combined (-226 and -228) detected at 1.53 pCi/L, 31x above the EWG health guideline of 0.05 pCi/L.
EPA compliance record
Official U.S. EPA records for JOLIET (system ID IL1970450) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Synthetic Organic Chemicals | Missed testing or reporting | 01/01/2023 | Open |
| Lead and Copper Rule Revisions | Required treatment not met | 10/17/2024 | Open |
| Radionuclides and Revised Rad Rule | Missed testing or reporting | 10/01/2024 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Recommended filters for JOLIET
Filters matched to the specific contaminants in JOLIET's water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Reverse osmosis certified for radium (NSF/ANSI 58)
$429-$750RO certified for radium 226/228 reduces it; ion-exchange water softeners also reduce radium.
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 JOLIET'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 |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
1.06 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 266× over |
| Radium, combined (-226 and -228) Radiological |
1.53 pCi/L | 0.05 | 5.0 | — | — | — | — | 31× over |
| Uranium Radiological |
0.38 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | Below guideline |
| Chlorate Disinfection byproduct |
165.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Haloacetic acids (HAA5) Disinfection byproduct |
0.0356 ppb | 0.1 | 60.0 | 60 | — | — | — | Below guideline |
| Dichloroacetic acid Disinfection byproduct |
0.0356 ppb | 0.2 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
8.77 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Selenium Heavy metal |
2.05 ppb | 30.0 | 50.0 | 20 | 40 | 30 | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0118 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Barium Heavy metal |
17.2 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
0.188 ppb | 40.0 | — | — | — | — | — | Below guideline |
| 2,4,5-TP (Silvex) Other |
0.00911 ppb | 3.0 | 50.0 | — | — | — | — | Below guideline |
| Strontium Radiological |
2.42 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
1.49 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
1.14 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.215 ppb | — | — | — | — | — | — | 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 JOLIET.