Editorial standards

AI use disclosure

City pages are drafted with AI (Claude Sonnet 4.6), reviewed by our editorial team, and published only after passing uniqueness and factual-accuracy checks. One in every ten pages receives full human review.

Sourcing

• Master plumber licensing: Missouri Office of Plumbing Boards (Mo. Rev. Stat. § 327.071) via pr.mo.gov, plus St. Louis and Kansas City municipal licensing offices.
• Plumbing standards and code: Missouri State Plumbing Code as adopted; municipal AHJ amendments for St. Louis, Kansas City, Springfield, and Columbia.
• Storm and combined-sewer overflow data: National Weather Service St. Louis (LSX), NWS Kansas City/Pleasant Hill (EAX), and NWS Springfield (SGF).
• Sewer backup loss prevention and post-event guidance: FEMA sewer backup mitigation guidance and IBHS (Insurance Institute for Business & Home Safety) bulletins.
• Water mitigation after backup: IICRC S500 Standard for Professional Water Damage Restoration and IICRC S520 (where Category 3 black-water contamination is involved).
• Municipal sewer systems: St. Louis Metropolitan Sewer District (MSD) homeowner backup grant program, Kansas City Water Services CSO/SSO records.
• City populations: US Census Bureau (2020).
• Cost data: aggregated from HomeAdvisor, Angi, and Plumbing-Heating-Cooling Contractors Association (PHCC) regional surveys for the Midwest market.

Corrections

Factual errors: email corrections@mosewer247.com. We investigate within 7 business days.

What we do not do

• Do not publish fake reviews or fabricated contractor profiles.
• Do not claim master plumber licenses we do not hold (we are a referral directory).
• Do not perform sewer or plumbing work — work is by independent licensed master plumbers.
• Do not provide plumbing-code interpretation. State plumbing code, municipal amendments, and AHJ requirements vary across Missouri municipalities; always defer to the permit office with jurisdiction over your property.