Price-Prather House · Photo: Nyttend · Public domainLiving in Williamsville, IL: what to set up and who to call
Tap water in Williamsville comes from the Williamsville 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 below detection. Public schools here are run by Williamsville Community Unit School District 15.
I’m new in town
What to set up in Williamsville, 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 Williamsville.
Power comes from Ameren Illinois Company
Ameren Illinois Company (Ameren Illinois Company), an investor-owned utility, serves all of Williamsville. Its homes paid an average of 16.7¢ per kWh in 2025, about $148 a month (its average across Illinois, for customers on its standard service). Illinois lets you buy power from another supplier; 45% of Ameren Illinois Company’s home customers do, and Ameren Illinois Company still delivers it.
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Williamsville water system
The Williamsville water system supplies Williamsville: about 92% of residents live in its service area. About 8% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It buys treated surface water (EPA lists Springfield as seller) and serves 6,198 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 2023–Dec 2025, was 0.0 ppb, below the 15 ppb action level that applied. Results below detection are reported as 0, so 0 doesn’t mean no lead at any tap.
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 (EPA’s estimate). Violations are counted by the start of their compliance period. IL1671300.
7 home internet providers serve Williamsville
100% of 602 addresses can get 100/20 Mbps; 99% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Cass Cable TV | Fiber | 100% | 2,000/2,000 |
| Frontier | DSL | 68% | 10/1 |
| Verizon | Fixed wireless | 93% | 300/20 |
| Rise Broadband | Fixed wireless | 84% | 50/10 |
| AT&T | Fixed wireless | 83% | 100/20 |
| Watch Communications | Fixed wireless | 41% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Williamsville’s trash rules yet
Pickup rules, the dump and recycling in Williamsville.
Where your child goes to school
Public school districts and the school path by grade.
Williamsville is in Williamsville Community Unit School District 15.
ASchool 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.
Williamsville spans 2 ZIP codes
ZIP codes where Williamsville residents live, with the share of the town in each.
| ZIP | Post office name | Share of Williamsville | ZIP’s residents in Williamsville |
|---|---|---|---|
| 62693 | Williamsville, IL | 92% | 75% |
| 62684 | Sherman, IL | 8% | 2% |
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 Williamsville
Who supplies Williamsville’s drinking water, and has it had violations?
The Williamsville water system (EPA ID IL1671300). 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 0.0 ppb (Jan 2023–Dec 2025), against a 15 ppb action level.
Who provides electricity in Williamsville?
Ameren Illinois Company (Ameren Illinois Company), an investor-owned utility. Its homes paid about 16.7¢ per kWh in 2025 (EIA).
What internet providers serve Williamsville?
Cass Cable TV, Frontier, Verizon, Rise Broadband, AT&T, Watch Communications (FCC, as of December 2025).
What ZIP codes are in Williamsville?
62693 (92%), 62684 (8%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Williamsville in?
Williamsville Community Unit School District 15.
How do I register to vote in Williamsville?
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 Sangamon County Clerk. 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: OpenStreetMap, Geofabrik extract of Oct 9, 2026. © OpenStreetMap contributors (ODbL).
- 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.