Water Quality Report · Updated October 07, 2026
JOLIET
JOLIET delivers tap water graded B (75/100) by TapWaterSafety.org. The utility serves approximately 160,000 residents in JOLIET, Illinois using groundwater. The most significant water quality concerns are: Arsenic significantly above health guideline; Radium, combined (-226 and -228) significantly above health guideline. For questions, the utility can be reached at 815-724-4222.
Is JOLIET tap water safe to drink?
JOLIET delivers tap water that earns a grade of B (75/100) from TapWaterSafety.org — a good rating, with only minor concerns relative to health-based guidelines.
The utility serves 160,000 residents in JOLIET, drawing from groundwater.
Public testing data identifies 2 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Radium, combined (-226 and -228). For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
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.
Quick actions for JOLIET residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for 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.
Contact JOLIET
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for JOLIET
Filters matched to the specific contaminants in this 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.
Score breakdown
This utility's overall score of 75/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). 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 (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
JOLIET service area
This water system serves 1 community in Will County, Illinois. Click any city for its dedicated tap water quality page.
Find the right filter for JOLIET water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.