Water Quality in Oak Forest, IL: 2 Violations — Grade C
Grade C · Score 69/100 · 1 water system · Updated 2026-05-03
Oak Forest's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
EPA monitoring has flagged 2 reportable events for water systems in Oak Forest, IL.
Water Quality by ZIP Code in Oak Forest
Water quality varies across Oak Forest's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 60452 | C | 69 | 2 | 0 | View report → |
Water Quality Overview
Oak Forest, Illinois receives a water quality grade of C with an overall score of 69 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Oak Forest have accumulated 2 EPA violations (all monitoring/reporting type). These violations are tracked across 1 ZIP codes serving approximately 27,478 people.
What Grade C Means
A grade of C indicates moderate compliance issues. Oak Forest's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
The average 90th percentile lead level across Oak Forest water systems is 0.0027 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 73% of homes built before 1986, Oak Forest has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Oak Forest is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Oak Forest
Oak Forest is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 27,478 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 5 enforcement actions against water systems serving Oak Forest. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Oak Forest
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Oak Forest Water Systems
The following contaminants have been detected or caused violations across Oak Forest's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| Stage 2 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
| Surface Water Treatment Rule | Treatment Technique | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 5 enforcement actions against water systems serving Oak Forest. Recent actions:
| Date | Action Type |
|---|---|
| 2025-09-08 | State Informal Action |
| 2025-07-03 | State Informal Action |
| 2025-07-03 | State Informal Enforcement |
| 2021-02-03 | State Order Extension |
| 2021-01-06 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-09-08.
Oak Forest vs. Nearby Illinois Cities
How Oak Forest's water quality compares to similar cities in Illinois:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Oak Forest | C | 2 | 1 | 27,478 |
| Madison | C | 0 | 1 | 27,549 |
| National Stock Yards | D | 0 | 1 | 27,549 |
| Venice | C | 0 | 1 | 27,549 |
Common Questions About Oak Forest Water
These are the most common questions residents search for about water quality in Oak Forest, Illinois:
Is Oak Forest water hard or soft? Water hardness varies by source. Oak Forest's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Oak Forest tap water? Oak Forest's water receives a grade of C (69/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Oak Forest? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Oak Forest vs. Illinois Average
Understanding how Oak Forest compares to the broader Illinois average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Oak Forest.
ZIP Codes in Oak Forest
Oak Forest spans 1 ZIP code. The ZIP with the lowest water quality score is 60452. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.