Photo: TCP04 · CC BY 4.0Living in Defiance, MO: what to set up and who to call
Defiance has no town government of its own, so St. Charles County runs its elections and most services, and its children attend Francis Howell R-III School District. For home internet, most of Defiance can choose between Brightspeed and Spectrum.
I’m new in town
What to set up in Defiance, 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 Defiance.
Power comes from Union Electric
Union Electric (Union Electric Co - (MO)), an investor-owned utility, serves all of Defiance. Its homes paid an average of 13.3¢ per kWh in 2025, about $137 a month (its average across Missouri).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from St Charles County Pwsd 2
St Charles County Pwsd 2 supplies almost all of Defiance. It buys treated surface water (EPA lists St Louis City PWS as seller) and serves 100,587 people in all.
No health-based violations reported to EPA in the five years to October 2026, like 86% of the 332 systems serving 100,001–250,000 people.
The latest lead result on file, the 90th percentile of homes sampled in Jan–Jun 2026, was 2.3 ppb, below the 15 ppb action level that applied. That’s higher than 71% 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. Violations are counted by the start of their compliance period. MO6024530.
6 home internet providers serve Defiance
59% of 106 addresses can get 100/20 Mbps; 51% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Brightspeed | DSL | 69% | 40/3 |
| Spectrum | Fiber | 51% | 1,000/1,000 |
| Verizon | Fixed wireless | 75% | 25/6 |
| Wisper | Fixed wireless | 17% | 400/30 |
| AT&T | Fixed wireless | 11% | 25/3 |
| T-Mobile | Fixed wireless | 10% | 100/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Defiance’s trash rules yet
Pickup rules, the dump and recycling in Defiance.
Where your child goes to school
Public school districts and the school path by grade.
Most of Defiance (61%) is in Francis Howell R-III School District; parts are in Washington School District (39%).
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
Defiance is unincorporated, so St. Charles County is the local government.
Election office: FVAP local election office directory, updated Aug 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Defiance is in ZIP code 63341
ZIP codes where Defiance residents live, with the share of the town in each.
| ZIP | Post office name | Share of Defiance | ZIP’s residents in Defiance |
|---|---|---|---|
| 63341 | Defiance, MO | 100% | 4% |
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 Defiance
Who supplies Defiance’s drinking water, and has it had violations?
St Charles County Pwsd 2 (EPA ID MO6024530). It reported no health-based violations to EPA in the five years to October 2026; 86% of systems its size had none. Its latest lead 90th percentile was 2.3 ppb (Jan–Jun 2026), against a 15 ppb action level.
Who provides electricity in Defiance?
Union Electric (Union Electric Co - (MO)), an investor-owned utility. Its homes paid about 13.3¢ per kWh in 2025 (EIA).
What internet providers serve Defiance?
Brightspeed, Spectrum, Verizon, Wisper, AT&T, T-Mobile (FCC, as of December 2025).
What ZIP codes are in Defiance?
63341. Census 2020 ZIP Code Tabulation Areas.
What school district is Defiance in?
Francis Howell R-III School District. Parts of the city are in Washington School District.
How do I register to vote in Defiance?
In Missouri you can register online until 27 days before Election Day, in person until 27 days before Election Day, or by mail (postmarked 27 days before). Elections here are run by the St. Charles. Check your registration at voteroutreach.sos.mo.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.