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The Lake St. Clair handbook

Living in Lake St. Clair, MO: what to set up and who to call

Lake St. Clair has no town government of its own, so Franklin County runs its elections and most services, and its children attend St. Clair R-XIII School District. Missouri Baptist Sullivan Hospital, 12.8 miles away, is the nearest emergency room.

Who supplies the water?Which school will my kid attend?How do I register to vote?ZIP codes
Lake St. Clair has no town government. It’s a census-designated place in Franklin County, so the county and regional agencies provide most services. This page answers what we can; the same answers appear on Lake St. Clair’s town page under “Getting set up”.

I’m new in town

What to set up in Lake St. Clair, and who provides it. Tap an answer for the details and where they come from.

PowerUnion Electricinvestor-owned utility · 13.3¢/kWhMore →WaterSt Clair PWS0 health-based violations in 5 years · EPAMore →
InternetWhich providers serve Lake St. ClairData pending · FCC map (D4)
Trash & dumpNot on file yetWe don’t have Lake St. Clair’s trash rules yetMore →SchoolSt. Clair R-XIII School DistrictWhich school depends on grade and addressMore →Register to voteOnlineRules from vote.govMore →ZIP code63077Where people live, not P.O. boxesMore →
Home services

Power, water and internet

Who to call to start service at a new address in Lake St. Clair.

Electricity

Power comes from Union Electric

Union Electric (Union Electric Co - (MO)), an investor-owned utility, serves all of Lake St. Clair. 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.

Drinking water · reported to EPA

Water comes from St Clair PWS

St Clair PWS supplies Lake St. Clair: about 91% of residents live in its service area. About 9% 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 4,700 people in all.

No health-based violations reported to EPA in the five years to October 2026, like 80% of the 5,012 systems serving 3,301–10,000 people.

Lead, 90th percentile2.2 ppb
015 ppb action level20

The latest lead result on file, the 90th percentile of homes sampled in Jan 2024–Dec 2026, was 2.2 ppb, below the 15 ppb action level that applied. The highest in five years was 3.1 ppb. That’s higher than 74% 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. MO6010708.

Internet

Which providers serve Lake St. Clair

Data pending · D4

This card will list the home internet providers the FCC’s National Broadband Map shows in Lake St. Clair, the share of addresses that can get 100/20 Mbps and the share with fiber, with the map’s “as of” date.

Source to come: FCC Broadband Data Collection.

Trash & recycling

We don’t have Lake St. Clair’s trash rules yet

Pickup rules, the dump and recycling in Lake St. Clair.

Trash, recycling and bulk pickupNot on fileLake St. Clair has no town government of its own, so look for trash and recycling rules on the county’s site.
Schools

Where your child goes to school

Public school districts and the school path by grade.

Lake St. Clair kids go to
PK–2ST. Clair Elem.in St Clair
3–5Edgar Murray Elem.in St Clair
6–8ST. Clair JR. Highin St Clair
9–12ST. Clair Highin St Clair

Lake St. Clair is in St. Clair R-XIII 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.

Government & voting

No town hall: the county runs things

Lake St. Clair is unincorporated, so Franklin County is the local government.

Local governmentFranklin CountyLake St. Clair is a census-designated place: no town hall of its ownCensus
Who runs elections hereFranklinElections here are run by Franklin County (county election office). 400 E. Locust, Ste. 201, Union, MO 63084 · (636) 583-6364 · [email protected]FVAP, Aug 2019
Register to voteOnlineIn 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).vote.govCheck your registration and polling placevoteroutreach.sos.mo.govThe state’s voter lookup

Election office: FVAP local election office directory, updated Aug 2019; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.

ZIP codes & area codes

Lake St. Clair is in ZIP code 63077

ZIP codes where Lake St. Clair residents live, with the share of the town in each.

ZIPPost office nameShare of Lake St. ClairZIP’s residents in Lake St. Clair
63077Saint Clair, MO100%7%

Census 2020 ZIP Code Tabulation Areas, by census block; post office names: GeoNames (CC BY 4.0). ZIPs created since 2020 are missing.

Everyday places

Getting around, the ER and the library

One line each; the subject pages have the rest.

Nearest emergency roomMissouri Baptist Sullivan Hospital12.8 miles awayGet a library cardUnion Branch251 Union Plaza Dr · (636) 583-3224

ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.

Questions about living in Lake St. Clair

Who supplies Lake St. Clair’s drinking water, and has it had violations?

St Clair PWS (EPA ID MO6010708). It reported no health-based violations to EPA in the five years to October 2026; 80% of systems its size had none. Its latest lead 90th percentile was 2.2 ppb (Jan 2024–Dec 2026), against a 15 ppb action level.

Who provides electricity in Lake St. Clair?

Union Electric (Union Electric Co - (MO)), an investor-owned utility. Its homes paid about 13.3¢ per kWh in 2025 (EIA).

What ZIP codes are in Lake St. Clair?

63077. Census 2020 ZIP Code Tabulation Areas.

What school district is Lake St. Clair in?

St. Clair R-XIII School District.

How do I register to vote in Lake St. Clair?

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 Franklin. 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): pending.