Photo: Jared Winkler · CC BY-SA 4.0Living in Diagonal, IA: what to set up and who to call
All of Diagonal gets its mail under one ZIP code, 50845. Kinetic is the only wired internet provider that reaches most of Diagonal.
I’m new in town
What to set up in Diagonal, 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 Diagonal.
Power comes from Interstate Power and Light
Interstate Power and Light (Interstate Power and Light Co), an investor-owned utility, serves all of Diagonal. Its homes paid an average of 17.8¢ per kWh in 2025, about $131 a month (its average across Iowa).
Start or move service: alliantenergy.com · (319) 786-4411
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Diagonal Water Department
Diagonal Water Department supplies almost all of Diagonal. It buys treated surface water (EPA lists Sirwa #2 (Creston) as seller) and serves 338 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 77% of the 15,074 systems serving 101–500 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2020–Dec 2022, was 1.6 ppb, below the 15 ppb action level that applied. That’s higher than 66% 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. IA8018040.
3 home internet providers serve Diagonal
94% of 163 addresses can get 100/20 Mbps; 0% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Kinetic | DSL | 97% | 200/20 |
| Lockridge Networks | Fixed wireless | 100% | 100/20 |
| Nextlink | Fixed wireless | 58% | 1,000/1,000 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Diagonal’s trash rules yet
Pickup rules, the dump and recycling in Diagonal.
Where your child goes to school
Public school districts and the school path by grade.
Diagonal is in Diagonal Community 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.
Town hall and registering to vote
Who to call, and how to register.
Election office: FVAP local election office directory, updated Aug 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Diagonal is in ZIP code 50845
ZIP codes where Diagonal residents live, with the share of the town in each.
| ZIP | Post office name | Share of Diagonal | ZIP’s residents in Diagonal |
|---|---|---|---|
| 50845 | Diagonal, IA | 100% | 44% |
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 Diagonal
Who supplies Diagonal’s drinking water, and has it had violations?
Diagonal Water Department (EPA ID IA8018040). It reported no health-based violations to EPA in the five years to October 2026; 77% of systems its size had none. Its latest lead 90th percentile was 1.6 ppb (Jan 2020–Dec 2022), against a 15 ppb action level.
Who provides electricity in Diagonal?
Interstate Power and Light (Interstate Power and Light Co), an investor-owned utility. Its homes paid about 17.8¢ per kWh in 2025 (EIA).
What internet providers serve Diagonal?
Kinetic, Lockridge Networks, Nextlink (FCC, as of December 2025).
What ZIP codes are in Diagonal?
50845. Census 2020 ZIP Code Tabulation Areas.
What school district is Diagonal in?
Diagonal Community School District.
How do I register to vote in Diagonal?
In Iowa you can register online until 15 days before Election Day, in person up to and including Election Day, or by mail (postmarked 15 days before). Elections here are run by the Ringgold County Auditor. Check your registration at sos.iowa.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.