Photo: Bobak Ha'Eri · CC BY 3.0Living in Colby, WI: what to set up and who to call
In Colby, trash day is Tuesday. Tap water in Colby comes from Colby Waterworks, which has a clean five-year EPA record (about 22% of systems its size had a health-based violation) and a latest lead result of 0.9 ppb.
I’m new in town
What to set up in Colby, 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 Colby.
Power comes from Clark Electric Coop
Clark Electric Coop (Clark Electric Coop - (WI)), a cooperative utility, serves all of Colby. Its homes paid an average of 14.4¢ per kWh in 2025, about $178 a month (its average across Wisconsin).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Colby Waterworks
Colby Waterworks supplies Colby: about 95% of residents live in its service area. About 5% of homes are outside any mapped community water system, most likely on private wells, which EPA doesn’t regulate. It draws ground water and serves 1,829 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 78% of the 7,966 systems serving 1,001–3,300 people.
The latest lead result on file, the 90th percentile of homes sampled in Jun–Sep 2023, was 0.9 ppb, below the 15 ppb action level that applied. That’s lower than 52% 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 (EPA’s estimate). Violations are counted by the start of their compliance period. WI7370169.
6 home internet providers serve Colby
100% of 726 addresses can get 100/20 Mbps; 3% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 94% | 1,000/1,000 |
| Frontier | DSL | 77% | 10/1 |
| Country Wireless | Fixed wireless | 100% | 100/100 |
| T-Mobile | Fixed wireless | 72% | 25/3 |
| Verizon | Fixed wireless | 34% | 25/6 |
| AT&T | Fixed wireless | 21% | 25/3 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
Trash day in Colby is Tuesday
Pickup days, the drop-off and recycling in Colby, from the town’s own site.
This month
- TrashEvery week
From ci.colby.wi.us, the town’s official site, checked Oct 22, 2026; pages dated 2026-10-22. 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.
Colby is in Colby School District.
CSchool 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 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Colby is in ZIP code 54421
ZIP codes where Colby residents live, with the share of the town in each.
| ZIP | Post office name | Share of Colby | ZIP’s residents in Colby |
|---|---|---|---|
| 54421 | Colby, WI | 100% | 53% |
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 Colby
Who supplies Colby’s drinking water, and has it had violations?
Colby Waterworks (EPA ID WI7370169). It reported no health-based violations to EPA in the five years to October 2026; 78% of systems its size had none. Its latest lead 90th percentile was 0.9 ppb (Jun–Sep 2023), against a 15 ppb action level.
Who provides electricity in Colby?
Clark Electric Coop (Clark Electric Coop - (WI)), a cooperative utility. Its homes paid about 14.4¢ per kWh in 2025 (EIA).
What internet providers serve Colby?
Spectrum, Frontier, Country Wireless, T-Mobile, Verizon, AT&T (FCC, as of December 2025).
What ZIP codes are in Colby?
54421. Census 2020 ZIP Code Tabulation Areas.
What school district is Colby in?
Colby School District.
How do I register to vote in Colby?
In Wisconsin you can register online until 20 days before Election Day, in person up to and including Election Day, or by mail (postmarked 20 days before). Elections here are run by the City of Colby Clerk. Check your registration at myvote.wi.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: Colby’s own website (ci.colby.wi.us), read Oct 22, 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 Nov 18, 2024 (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.