Photo: Frank Kovalchek from Anchorage, Alaska, USA · CC BY 2.0Living in Bay St. Louis, MS: what to set up and who to call
The City of Bay St Louis water system reported 5 health-based violations to EPA in the last five years: disinfection byproducts (TTHM) ×5. 80% of systems its size reported none. Trains stop in Bay St. Louis, at Bay Saint Louis.
I’m new in town
What to set up in Bay St. Louis, 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 Bay St. Louis.
Power comes from Mississippi Power
Mississippi Power (Mississippi Power Co), an investor-owned utility, serves all of Bay St. Louis. Its homes paid an average of 15.7¢ per kWh in 2025, about $179 a month (its average across Mississippi).
Service territory: HIFLD Electric Retail Service Territories (map dated Aug 2023). Prices and customers: EIA-861, 2025.
Water comes from City of Bay St Louis water system
The City of Bay St Louis water system supplies Bay St. Louis: about 82% of residents live in its service area. Hancock County Water & Sewer serves another 16%. About 10% 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 9,284 people in all.
5 health-based violations reported to EPA in the five years to October 2026: disinfection byproducts (TTHM) ×5, the latest beginning Oct 2024. 80% of the 5,012 systems serving 3,301–10,000 people had none.
The latest lead result on file, the 90th percentile of homes sampled in Jan 2022–Dec 2024, was 9.0 ppb, below the 15 ppb action level that applied. That’s higher than 98% 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. MS0230001.
6 home internet providers serve Bay St. Louis
100% of 5,485 addresses can get 100/20 Mbps; 94% can get fiber.
| Provider | Technology | Addresses | Fastest (Mbps) |
|---|---|---|---|
| Mediacom Xtream | Cable, Fiber | 99% | 1,000/50 |
| AT&T | Fiber, DSL, Fixed wireless | 88% | 5,000/5,000 |
| CoastConnect | Fiber | 47% | 2,000/1,000 |
| C Spire | Fixed wireless | 100% | 100/20 |
| T-Mobile | Fixed wireless | 69% | 100/20 |
| Verizon | Fixed wireless | 61% | 300/20 |
FCC National Broadband Map, as of December 2025. Availability as providers report it, not speeds people get.
We don’t have Bay St. Louis’ trash rules yet
Pickup rules, the dump and recycling in Bay St. Louis.
Where your child goes to school
Public school districts and the school path by grade.
Most of Bay St. Louis (78%) is in Bay St. Louis-Waveland School District; parts are in Hancock County School District (22%).
A−School gradeSee 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 Sep 2023; jurisdictions: EAC EAVS 2024. Registration rules and links: vote.gov, updated Nov 18, 2024.
Bay St. Louis is in ZIP code 39520
ZIP codes where Bay St. Louis residents live, with the share of the town in each.
| ZIP | Post office name | Share of Bay St. Louis | ZIP’s residents in Bay St. Louis |
|---|---|---|---|
| 39520 | Bay Saint Louis, MS | 100% | 62% |
39521 is P.O. box or single-organization ZIP with no homes.
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.
Train: OpenStreetMap (© OpenStreetMap contributors). ER: CMS hospital data. Library: IMLS Public Libraries Survey, FY2024.
Questions about living in Bay St. Louis
Who supplies Bay St. Louis’ drinking water, and has it had violations?
The City of Bay St Louis water system (EPA ID MS0230001). It reported 5 health-based violations to EPA in the five years to October 2026: disinfection byproducts (TTHM) ×5. 80% of systems its size had none. Its latest lead 90th percentile was 9.0 ppb (Jan 2022–Dec 2024), against a 15 ppb action level.
Who provides electricity in Bay St. Louis?
Mississippi Power (Mississippi Power Co), an investor-owned utility. Its homes paid about 15.7¢ per kWh in 2025 (EIA).
What internet providers serve Bay St. Louis?
Mediacom Xtream, AT&T, CoastConnect, C Spire, T-Mobile, Verizon (FCC, as of December 2025).
What ZIP codes are in Bay St. Louis?
39520. Census 2020 ZIP Code Tabulation Areas.
What school district is Bay St. Louis in?
Bay St. Louis-Waveland School District. Parts of the city are in Hancock County School District.
How do I register to vote in Bay St. Louis?
Mississippi has no online registration; you can register in person until 30 days before Election Day or by mail (postmarked 30 days before). Elections here are run by the Hancock County Registrar. Check your registration at msegov.com.
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.