# Commercial Plumber in Weldon Spring, MO > In Weldon Spring, water is supplied by Missouri American Water. Legacy Plumbing offers commercial plumbing and select residential service there. Canonical: https://legacyplumbingmo.com/service-area/weldon-spring-mo Last updated: 2026-10-30 St. Charles County, MO Weldon Spring relies on the St. Charles County Building and Code Enforcement Division for permits. Legacy Plumbing serves Weldon Spring with commercial plumbing and select residential service. Our Weldon Spring dental scope connected chair-side compressed air and vacuum piping to a new compressor and vacuum pump, and included a sterile-area stainless sink. [Request a Bid in Weldon Spring](https://legacyplumbingmo.com/contact-us) [636-978-0120](tel:+16369780120) ## Free Estimate — Weldon Spring Same-business-day response from our O'Fallon office. ## Who permits plumbing work in Weldon Spring Public facts from government and utility sources, not Legacy Plumbing project claims. - The city does not issue building permits itself; it contracts with the St. Charles County Building and Code Enforcement Division. [City of Weldon Spring](https://weldonspring.gov/codeenforcement) - Water is supplied by Missouri American Water; sewer is Duckett Creek Sanitary District. [City of Weldon Spring](https://weldonspring.gov/utilities) - Weldon Spring is a fourth-class city, incorporated in 1984. [Missouri Secretary of State](https://sos.mo.gov/cmsimages/bluebook/2023-2024/8_Counties.pdf) Public sources checked 2026-10-30 ## Commercial plumbing services in Weldon Spring ### Tenant build-outs Office, retail and medical suites in Weldon Spring, with permits through the county. Explore tenant build-outs ### Ground-up new construction Underground through trim-out for new St. Charles County buildings in Weldon Spring. Explore ground-up new construction ### Service & repair Scheduled repairs, water heaters and drain work for Weldon Spring properties, plus select residential calls. Explore service & repair ### Backflow install & testing Annual testing and assembly replacement for Weldon Spring buildings. Explore backflow install & testing ## Scheduling commercial plumbing in Weldon Spring Weldon Spring sits in St. Charles County, MO, roughly 7 straight-line miles from our O'Fallon shop; the closest towns we also serve are Cottleville (about 2 mi), Dardenne Prairie (about 6 mi) and O'Fallon (about 6 mi). Legacy Plumbing has worked as a UA Local 562 signatory [commercial plumbing contractor in St. Louis](https://legacyplumbingmo.com/) since 1996, and the [St. Charles County plumbing hub](https://legacyplumbingmo.com/locations/st-charles-county) covers the wider area. ## Licensed to pull plumbing permits in Weldon Spring Plumbing permits for Weldon Spring go through the jurisdiction covering Weldon Spring in St. Charles County, and Legacy Plumbing holds the licensing to pull them. Our master plumbers file permits across every St. Louis–area jurisdiction we serve, from St. Louis City, St. Louis County and its municipalities, St. Charles County and Jefferson County. ## Legacy Plumbing projects in and near Weldon Spring We have 1 documented project in Weldon Spring itself and 8 more elsewhere in St. Charles County, covering dental air and vacuum system, ground-up commercial pad, manufacturing facility and fitness club. Distances are straight-line between town centers. - [In Weldon Spring ### Dental air and vacuum system (2022) Weldon Spring Chair-side compressed air and vacuum piping connected to a new compressor and vacuum pump, plus a stainless sink in the sterile area. View project scope](https://legacyplumbingmo.com/projects/dental-air-vacuum-system-weldon-spring-mo) - [Near Weldon Spring — O'Fallon, ~6 mi ### Ground-up commercial pad O'Fallon Underground sanitary, storm and water service with backflow prevention plus grease waste and interceptor piping, turned over on schedule for vertical construction. View project scope](https://legacyplumbingmo.com/projects/ground-up-site-utilities-ofallon-mo) - [Near Weldon Spring — St. Peters, ~6 mi ### Manufacturing facility St. Peters Underground rough-in coordinated with the slab schedule, followed by water distribution and equipment connections so the plant came online without production delays. View project scope](https://legacyplumbingmo.com/projects/manufacturing-facility-st-peters-mo) - [Near Weldon Spring — St. Peters, ~6 mi ### Fitness club (2024) St. Peters Locker-room plumbing with six showers, sensor faucets and flush valves, three tankless water heaters with circulation, and two drinking fountains. View project scope](https://legacyplumbingmo.com/projects/fitness-club-plumbing-st-peters-mo) ## Documented project work in Weldon Spring & nearby - [Dental air and vacuum — Weldon Spring](https://legacyplumbingmo.com/projects/dental-air-vacuum-system-weldon-spring-mo) FAQ ## Weldon Spring Plumbing Questions - **Who issues commercial plumbing permits in Weldon Spring?:** The city does not issue building permits itself; it contracts with the St. Charles County Building and Code Enforcement Division. ## Nearby areas we serve - [Commercial plumbing in Dardenne Prairie](https://legacyplumbingmo.com/service-area/dardenne-prairie-mo) - [Commercial plumbing in Cottleville](https://legacyplumbingmo.com/service-area/cottleville-mo) - [Commercial plumbing in Augusta](https://legacyplumbingmo.com/service-area/augusta-mo) - [Commercial plumbing in St. Charles County](https://legacyplumbingmo.com/locations/st-charles-county) - [Commercial plumbing in St. Peters](https://legacyplumbingmo.com/locations/st-peters) - [Commercial plumbing in St. Charles](https://legacyplumbingmo.com/locations/st-charles) ## Need a Plumber in Weldon Spring? Call 636-978-0120 or request your free estimate — we respond same business day across St. Charles County. [Get Free Estimate](https://legacyplumbingmo.com/contact-us) [636-978-0120](tel:+16369780120) ## Related - [Contact Legacy Plumbing](https://legacyplumbingmo.com/contact-us) - [Company facts](https://legacyplumbingmo.com/company-facts) - [All pages (llms.txt)](https://legacyplumbingmo.com/llms.txt)