Oak Brook, IL: 17 Violations — 60/100 (2026)
1 ZIP code · 8 water systems · Updated 2026-06-03
Although much of Oak Brook meets baseline drinking water standards, some IL-tracked service areas show violations that merit a closer look — particularly for older housing stock.
How Oak Brook Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Oak Brook Residents
- Your city's water systems recorded 17 violations in the past 5 years.
- Average lead level: 0.0008 mg/L.
- Homes built before 1986: 79% — older plumbing may contain lead solder.
- Estimated remediation: $3,000 per household.
- CDC health risk index: 10.67.
Oak Brook's Water Providers
At present, 3 utilities serve the bulk of Oak Brook, IL's residential water connections out of 8 systems active in the area, spread across independent providers with separate infrastructure and compliance obligations.
Overview
We track water quality and home safety data for 1 ZIP code in Oak Brook, Illinois (population ~10,012), covering 8 community water systems serving approximately 174,560 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Oak Brook: C (60/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Oak Brook water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0008 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Surface Water Treatment Rule | Treatment Technique | 6 | 1 |
| Consumer Confidence Report Rule | Reporting | 6 | 1 |
| Revised Total Coliform Rule | Microbiological | 6 | 1 |
| Contaminant 4109 | Other | 4 | 1 |
| Stage 1 DBP Rule | Treatment Technique | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 60523 | C | 17 | 0 | Oak Brook |
All ZIP Codes in Oak Brook
- 60523 [C] — 17 violations
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
Updated daily.
Oak Brook Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
What's in Oak Brook's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Oak Brook Infrastructure Age
With 79% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
When more than half a city's housing predates the 1986 federal ban on lead solder, plumbing-era lead risk becomes a citywide concern rather than an exception. Oak Brook's median build year of 1974 places it squarely in that category.
Over half of homes in Oak Brook were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Oak Brook
In Oak Brook, property wealth outpaces what documented remediation typically demands — the equity burden lands well within the low tier.
Remediation costs in Oak Brook are relatively low compared to home values. The $2,000–$4,000 estimated range is a small fraction of median property value. Home values are 299% above the Illinois average.
Oak Brook: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Older stock in Oak Brook represents 79% of the inventory, and citywide monitoring runs at or above the federal action level — making an in-home read a standard household-level step.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Oak Brook: Flood History & Water Damage Risk
Measured across the NFIP's multi-decade tracking period, Oak Brook shows a moderate flood record — 90 claims and 100% of ZIP codes carrying FEMA flood zone status. For water quality, that combination matters because flood events at this frequency can periodically stress infrastructure: treatment plants, private wells, and distribution systems all face elevated risk during significant flooding.
Oak Brook has a moderate flood history with 90 FEMA claims averaging $45,097 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$3,000</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Oak Brook
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Surface Water Treatment Rule can reduce the most common contaminant found in Oak Brook's water.
- Check your home's plumbing. With 79% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Oak Brook, IL