Aqua Illinois-oak Brook
EPA ID: IL0430055 · 5,361 people served · 6 ZIP codes
Water monitoring for Aqua Illinois-oak Brook: clean, five years, 5,361 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Aqua Illinois-oak Brook Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Aqua Illinois-oak Brook serves a community with a median household income of $100,084 and an estimated 146,319 residents across its service area. Approximately 83% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Aqua Illinois-oak Brook's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 1% of homes in DuPage County, Illinois rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 63th percentile nationally for proximity to wastewater discharge points. Surface water sources near wastewater outfalls may face additional treatment challenges.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites.
Infrastructure Risk
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 1 detection recorded. 1 exceeds federal EPA limits (4 ppt for PFOA/PFOS). 1 exceeds state limits.
Comparable Water Systems
Similar-sized systems in Illinois
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Aqua Illinois-oak Brook (EPA ID: IL0430055) is a community water system in Illinois that serves approximately 5,361 people from surface water sources.
This system provides water to 6 ZIP codes across 6 communities.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by IL or modeled from parcel and building-footprint data.
- 60148 — Lombard
- 60154 — Westchester
- 60162 — Hillside
- 60181 — Villa Park
- 60515 — Downers Grove
- 60523 — Oak Brook
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Aqua Illinois-oak Brook (IL0430055) on EPA.gov.
Frequently Asked Questions
Is Aqua Illinois-oak Brook water safe to drink?
Based on EPA records, Aqua Illinois-oak Brook has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Aqua Illinois-oak Brook serve?
Aqua Illinois-oak Brook serves approximately 5,361 people across 6 ZIP codes in Illinois.
Where does Aqua Illinois-oak Brook get its water?
The primary water source is surface water.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.