Photo: Dima Sergiyenko; Please attribute this image as the work of "DiscoverWithDima." · CC BY-SA 4.0Living in Oak Brook, IL: what to set up and who to call
In Oak Brook, trash day is Monday. Tap water in Oak Brook comes from the Oak Brook water system, which has a clean five-year EPA record (about 20% of systems its size had a health-based violation) and a latest lead result of 0.5 ppb.
I’m new in town
What to set up in Oak Brook, and who provides it. Tap an answer for the details and where they come from.
Power, water and internet
Who to call to start service at a new address in Oak Brook.
Power comes from Commonwealth Edison
Commonwealth Edison (Commonwealth Edison Co), an investor-owned utility, serves all of Oak Brook. Its homes paid an average of 17.7¢ per kWh in 2025, about $107 a month (its average across Illinois, for customers on its standard service). Illinois lets you buy power from another supplier; 20% of Commonwealth Edison’s home customers do, and Commonwealth Edison still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Oak Brook water system
The Oak Brook water system supplies almost all of Oak Brook. It buys treated surface water (EPA lists Elmhurst and Du Page Water Commission as sellers) and serves 9,400 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 0.5 ppb, below the 15 ppb action level that applied. The highest in five years was 2.1 ppb. That’s lower than 63% of similar systems’ latest results.
The system’s full record: EPA ECHO report
EPA SDWIS via Envirofacts (violations pulled Oct 9, 2026) and ECHO (lead samples, 2026Q3); service area: EPA Community Water System Service Area Boundaries v3.0. Violations are counted by the start of their compliance period. IL0430700.
5 home internet providers serve Oak Brook
100% of 2,981 addresses can get 100/20 Mbps; 8% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Xfinity | Cable | 100% | 2,000/250 |
| AT&T | DSL, Fixed wireless | 85% | 100/20 |
| Ezee Fiber | Fiber | 8% | 8,000/8,000 |
| Verizon | Fixed wireless | 94% | 300/20 |
| T-Mobile | Fixed wireless | 67% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in Oak Brook is Monday
Pickup days, the drop-off and recycling in Oak Brook, from the town’s own site.
This month
- TrashEvery week
- RecyclingEvery week, Mon
- Bulky itemsCall to book
York Township Highway Department
19W475 Roosevelt Road, Lombard
From oak-brook.org, the town’s official site, checked Oct 21, 2026. Rules change: the town’s page is the last word. .
Where your child goes to school
Public school districts and the school path by grade.
Oak Brook is in two districts that split the grades: Hinsdale Township High School District 86 and Butler School District 53.
A+School gradeSee Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Jun 2025; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Sep 12, 2025.
Oak Brook is in ZIP code 60523
ZIP codes where Oak Brook residents live, with the share of the town in each.
| ZIP | Post office name | Share of Oak Brook | ZIP’s residents in Oak Brook |
|---|---|---|---|
| 60523 | Oak Brook, IL | 99% | 78% |
A few homes fall in 60181.
Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.
Getting around, the ER and the library
One line each; the subject pages have the rest.
ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Oak Brook
Who supplies Oak Brook’s drinking water, and has it had violations?
The Oak Brook water system (EPA ID IL0430700). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 0.5 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.
Who provides electricity in Oak Brook?
Commonwealth Edison (Commonwealth Edison Co), an investor-owned utility. Its homes paid about 17.7¢ per kWh in 2025 (EIA).
What internet providers serve Oak Brook?
Xfinity, AT&T, Ezee Fiber, Verizon, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Oak Brook?
60523. Census 2020 ZIP Code Tabulation Areas.
What school district is Oak Brook in?
Hinsdale Township High School District 86 and Butler School District 53. Parts of the city are in Community High School District 99 and Downers Grove Grade School District 58 and Elmhurst School District 205 and DuPage High School District 88 and Salt Creek School District 48 and Hinsdale Community Consolidated School District 181.
How do I register to vote in Oak Brook?
In Illinois you can register online until 16 days before Election Day, in person up to and including Election Day, or by mail (postmarked 28 days before). Elections here are run by the DuPage County Clerk - Election Division. Check your registration at ova.elections.il.gov.
Sources & dates
Every answer above names its source. Here they are with their dates.
- Water: EPA SDWIS (Envirofacts, pulled Oct 9, 2026), ECHO SDWA 2026Q3, EPA CWS Service Area Boundaries v3.0.
- Power: HIFLD Electric Retail Service Territories (map Aug 2023); EIA-861 final 2025.
- Trash: Oak Brook’s own website (oak-brook.org), read Oct 21, 2026, pickup and drop-off facts extracted and checked against the page they came from.
- ZIP codes: Census 2020 ZCTA relationship files; GeoNames postal codes (CC BY 4.0).
- Schools: NCES Common Core of Data, 2024–25.
- Registration: vote.gov, updated Sep 12, 2025 (read Oct 10, 2026). Official sites and area codes: Wikidata.
- Election office: FVAP local election office directory (fetched Oct 10, 2026; each record dated), EAC EAVS 2024 jurisdictions; registration and lookup links from vote.gov’s state data, checked Oct 10, 2026.
- Internet: FCC National Broadband Map, as of December 2025.