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GMP Plumbing LLC is a licensed plumbing company servicing all of St. Louis and Missouri's Jefferson and St. Charles counties. We are also licensed drain layers and backflow testers. We are insured, bonded and certified in pex piping, track gas piping, tankless water heaters and more.

  • Press Regulators
  • Backflows
  • Septic Repair
  • Stack Replacement

Stolen Water Pipes? We Replace with Pex! • High Gas Bills? Switch to a Tankless Water Heater

Commercial – New ConstructionBathroom

  • Strip Stores
  • Retail Stores
  • Restaurants
  • Doctor or Dental Offices
  • Car Washes
  • Gas Stations
  • Factories
  • Remodels
  • Repairs
  • Sewer Cabling


  • Water Heaters
  • Faucet Replacements
  • Toilets
  • Garbage Disposals
  • Sump Pumps
  • Pressure Regulators
  • Water Service
  • Sewer Lateral
  • Upgrade Galvanized Pipes
  • Locate Water Leaks
  • Locate Stop Box
  • Code Violations

New Construction
  • Remodels
  • Basement Baths
  • Room Additions
  • Total Renovations
  • Kitchen and Bath Remodels
Sewer Cabling
  • Main Sewer
  • Sink Drains
  • Floor Drains
  • Power Jetting
  • Camera Locate
Water Treatment 
  • Water Softeners
  • Water Purifiers
  • Water Filters
Backflow Prevention
  • Install New
  • Test Existing
  • Reverse Osmosis
Service Inspection

We offer a service inspection for your peace of mind. We can check pressure, check toilets for leaks, check for gas or exhaust leaks, and even help you with code violations. With each service inspection, you will receive a one-year labor discount of 10 percent on all repairs.

Give us a call today to schedule your appointment. Our entire team is fully committed to customer satisfaction and will work hard to provide skillful and dependable work that will last long after our vehicle has pulled out of your driveway.

Gary Parham, Master Plumber
(636) 464-2221

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