Living in Plainfield, IA: what to set up and who to call
Every home in Plainfield is in ZIP code 50666. Almost every address in Plainfield can get fiber (100%, by the FCC’s map).
I’m new in town
What to set up in Plainfield, 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 Plainfield.
Power comes from MidAmerican Energy
MidAmerican Energy (MidAmerican Energy Co), an investor-owned utility, serves all of Plainfield. Its homes paid an average of 11.2¢ per kWh in 2025, about $93 a month (its average across Iowa).
Start or move service: midamericanenergy.com · (888) 427-5632
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from Plainfield Water Supply
Plainfield Water Supply supplies Plainfield: about 89% of residents live in its service area. About 11% 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 393 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 2021–Dec 2023, was 4.0 ppb, below the 15 ppb action level that applied. That’s higher than 87% 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. IA0960045.
5 home internet providers serve Plainfield
100% of 224 addresses can get 100/20 Mbps; 100% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Butler-Bremer Mutual Telephone Company | Fiber | 100% | 1,000/1,000 |
| GigFire | Fixed wireless | 93% | 150/130 |
| T-Mobile | Fixed wireless | 84% | 100/20 |
| Nextlink | Fixed wireless | 59% | 100/20 |
| AT&T | Fixed wireless | 4% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Plainfield’s trash rules yet
Pickup rules, the dump and recycling in Plainfield.
Where your child goes to school
Public school districts and the school path by grade.
Plainfield is in Nashua-Plainfield 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 Jun 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Plainfield is in ZIP code 50666
ZIP codes where Plainfield residents live, with the share of the town in each.
| ZIP | Post office name | Share of Plainfield | ZIP’s residents in Plainfield |
|---|---|---|---|
| 50666 | Plainfield, 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 Plainfield
Who supplies Plainfield’s drinking water, and has it had violations?
Plainfield Water Supply (EPA ID IA0960045). 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 4.0 ppb (Jan 2021–Dec 2023), against a 15 ppb action level.
Who provides electricity in Plainfield?
MidAmerican Energy (MidAmerican Energy Co), an investor-owned utility. Its homes paid about 11.2¢ per kWh in 2025 (EIA).
What internet providers serve Plainfield?
Butler-Bremer Mutual Telephone Company, GigFire, T-Mobile, Nextlink, AT&T (FCC, as of December 2025).
What ZIP codes are in Plainfield?
50666. Census 2020 ZIP Code Tabulation Areas.
What school district is Plainfield in?
Nashua-Plainfield Community School District.
How do I register to vote in Plainfield?
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 Bremer 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.