Florissant, MO Building Safety: Plumbing Permits (2026)
Key Facts
- Code adopted
- 2021 IPC, Appendix E (Ord. 8748)
- License required
- St. Louis County Public Works
- Homeowner permit
- single-family owner-occupant only
- Emergency repair filing
- within 48 working hours
- Sewer depth minimum
- 30 inches below grade
- Violation penalty
- Section 100.080, daily offense
Summary
Florissant adopted the 2021 International Plumbing Code by Ordinance No. 8748, and Section 106.4.1 bars anyone without a St. Louis County plumbing or drainlayer license from installing, altering or repairing water supply, waste or sewer facilities in the city. A limited homeowner permit lets an owner do the work on their own detached single-family home.
Section 500.150. International Plumbing Code Adopted. ... is hereby adopted as the Plumbing Code of the City of Florissant, Missouri, subject to the amendments, additions, insertions, deletions and changes set out in Section 500.160 of this Chapter. ... Section ... 106.4.1 Licenses required (Added). No person who is not licensed by the St. Louis County Department of Public Works as a Master Plumber or a licensed Journeyman Plumber or a Registered Plumber or a Registered Plumber Apprentice working under the direction of a licensed Master Plumber shall engage in or perform the work of installing, altering or repairing facilities in a building for the supply and distribution of water for ordinary drinking, culinary and domestic purposes of facilities or for the removal therefrom of waterborne wastes except as set forth in Section 106.4.2. No person who is not licensed by the St. Louis County Department of Public Works as a Master or Journeyman Drainlayer shall engage in or perform the work of installing sanitary or storm sewer.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4989395; v43 updated 2026-05-26; through 05-26-2026).
Full Breakdown
160. 1 requires a St. Louis County Department of Public Works license as a Master Plumber, Journeyman Plumber, Registered Plumber or Registered Plumber Apprentice working under a licensed Master before anyone may install, alter or repair the facilities that supply drinking, culinary or domestic water or remove waterborne waste, and a separate county Drainlayer license is required to install a sanitary or storm sewer. 2 creates a Homeowner Plumbing Permit for an owner or immediate family member working on a detached single-family home they occupy, but it excludes gas lines and any work located underground, under a concrete slab or outside the building envelope, and the Building Official may require a competency test before issuing it, with a thirty-day wait to retest after a failure.
3 extends a narrower Multi-Family Maintenance Technician Water Heater Permit to a non-licensed technician employed at a multi-family property, subject to Building Official approval. 6 requires an emergency repair, made before a permit is issued, to have a permit application filed within forty-eight working hours of the repair. 1 sets building sewer depth at not less than thirty inches below finished grade at the septic tank connection or at any other point.
Violations & Fines
Installing, altering or repairing plumbing without the required county license, or in violation of approved plans or a directive of the Code Official, is subject to the penalties of Section 100.080 of the Code of Ordinances under Section 115.4, with each day a violation continues after notice treated as a separate offense.
Frequently Asked Questions
Who can legally do plumbing work in Florissant?
Can a homeowner install their own water heater or fix a leak?
How fast do I need a permit after an emergency plumbing repair?
How deep does a Florissant building sewer have to be buried?
Sources & Official References
Other rules in Florissant
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