Photo: Awkwafaba · CC BY-SA 3.0Living in Okauchee Lake, WI: what to set up and who to call
Okauchee Lake has no town government of its own, so Waukesha County runs its elections and most services, and its children attend Arrowhead Union High School District. Oconomowoc Waterworks has a clean five-year EPA record, but its latest lead result, 6.8 ppb, was higher than 94% of similar systems’ (the action level is 15).
I’m new in town
What to set up in Okauchee Lake, 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 Okauchee Lake.
Power comes from We Energies
We Energies (Wisconsin Electric Power Co.), an investor-owned utility, serves all of Okauchee Lake. Its homes paid an average of 20.5¢ per kWh in 2025, about $131 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 Oconomowoc Waterworks
Oconomowoc Waterworks supplies Okauchee Lake: about 27% of residents live in its service area. Lake Drive Water Trust serves another 11%. Mission Lakes II serves another 6%. About 55% 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 15,805 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 83% of the 3,525 systems serving 10,001–50,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jun–Sep 2023, was 6.8 ppb, below the 15 ppb action level that applied. That’s higher than 94% 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. WI2680227.
7 home internet providers serve Okauchee Lake
99% of 2,299 addresses can get 100/20 Mbps; 6% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Spectrum | Cable, Fiber | 98% | 1,000/35 |
| AT&T | DSL, Fiber, Fixed wireless | 80% | 100/20 |
| Bertram Communications | Fixed wireless | 89% | 100/20 |
| Netwurx | Fixed wireless | 56% | 100/20 |
| T-Mobile | Fixed wireless | 46% | 100/20 |
| Verizon | Fixed wireless | 14% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Okauchee Lake’s trash rules yet
Pickup rules, the dump and recycling in Okauchee Lake.
Where your child goes to school
Public school districts and the school path by grade.
Okauchee Lake is in two districts that split the grades: Arrowhead Union High School District and Oconomowoc Area School District.
Test scores and every school: see Schools →U.S. Department of Education, NCES Common Core of Data, 2024–25. Enrollment rules and registration are the district’s.
No town hall: the county runs things
Okauchee Lake is unincorporated, so Waukesha County is the local government.
Election office: FVAP local election office directory, updated Jun 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Okauchee Lake spans 3 ZIP codes
ZIP codes where Okauchee Lake residents live, with the share of the town in each.
| ZIP | Post office name | Share of Okauchee Lake | ZIP’s residents in Okauchee Lake |
|---|---|---|---|
| 53066 | Oconomowoc, WI | 81% | 11% |
| 53069 | Okauchee, WI | 14% | 100% |
| 53058 | Nashotah, WI | 5% | 8% |
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 Okauchee Lake
Who supplies Okauchee Lake’s drinking water, and has it had violations?
Oconomowoc Waterworks (EPA ID WI2680227). It reported no health-based violations to EPA in the five years to October 2026; 83% of systems its size had none. Its latest lead 90th percentile was 6.8 ppb (Jun–Sep 2023), against a 15 ppb action level.
Who provides electricity in Okauchee Lake?
We Energies (Wisconsin Electric Power Co.), an investor-owned utility. Its homes paid about 20.5¢ per kWh in 2025 (EIA).
What internet providers serve Okauchee Lake?
Spectrum, AT&T, Bertram Communications, Netwurx, T-Mobile, Verizon (FCC, as of December 2025).
What ZIP codes are in Okauchee Lake?
53066 (81%), 53069 (14%), 53058 (5%), by share of residents. Census 2020 ZIP Code Tabulation Areas.
What school district is Okauchee Lake in?
Arrowhead Union High School District and Oconomowoc Area School District. Parts of the city are in Stone Bank School District.
How do I register to vote in Okauchee Lake?
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 Town of Oconomowoc 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: 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 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.