Miami Plumbing: Licensing, Permits & Water

The City of Miami licenses no plumbers. What its Building Department runs is a registration gate: the DBPR state credential, the local business tax receipt, and coverage certificates delivered straight from the insurer, all on file before a permit issues. One layer up sits Miami-Dade County's own competency-certificate system, a county trades board that reviews plumbing applications under the county code, so a Miami plumber's paper trail can legitimately carry state, county and city entries at once.

• Authority. Florida DBPR Construction Industry Licensing Board (statewide); the City of Miami Building Department registers contractors before permits issue, and Miami-Dade County's Contractor Licensing Section adds county certificates of competency including plumbing
• Structure. The city licenses nobody itself: contractors register their DBPR credential with the Building Department, filing a state license copy, business tax receipt, and coverage certificates sent directly by the insurer. The county's separate competency-certificate layer (its trades board reviews plumbing applications) runs under the county code
• Worth knowing. Miami's owner-builder rule has a hard plumbing carve-out: even under an owner-builder master permit, plumbing sub-permits may only be issued to appropriately credentialed contractors. The owner cannot take the pipes.

Checked against the official source, September 2026: www.miami.gov. Statewide licensing itself is covered on the Florida page.

Miami's owner-builder process is the most exam-like in Florida: an in-person interview and a multiple-choice test at the Riverside Center counter, a notarized disclosure, proof of ownership and residence. Then comes a firm boundary, stated twice in city guidance: plumbing sub-permits issue only to credentialed contractors, who request their own inspections. What the city gives back is speed elsewhere: permits live 180 days, inspections book by sub-permit number and usually land the next day with a route tracker, and a sink changeout can clear through the Easy Permit by email.

• Permit office. City of Miami Building Department, Miami Riverside Center, 444 SW 2nd Ave, with applications through the iBuild portal
• Homeowner rule. Owner-builder permits exist exclusively for owner-occupied one- and two-family homes, after an in-person interview and a multiple-choice test at the Homeowner Assistance counter plus a notarized disclosure. But plumbing, electrical, mechanical, roofing and gas sub-permits go only to credentialed contractors, who also request their own trade inspections; one master permit per residence in any 24-month span.
• Process. A Miami permit runs 180 days from issuance or the last approved inspection; inspections are requested by sub-permit number up to five days ahead and usually happen the next day, with an inspector-route tracker on inspection day. Small jobs like plumbing repairs, re-piping or a bathroom lavatory changeout ride the Easy Permit straight from iBuild by email.

Checked against the official source, September 2026: www.miami.gov.

WASD's annual quality report describes the treatment rather than a number: Biscayne Aquifer water is lime-softened at the Orr plant, treated similarly at Hialeah, and enhanced-softened at Preston. No hardness figure appears in the primary document, which is why the 175 mg/L on our Florida page is drawn from regional reporting; the county has not yet published its own figure. What the county does publish is a lead service line inventory with an address lookup for residents. Construction follows the Florida Building Code Plumbing volume, 8th Edition.

• Utility. Miami-Dade Water and Sewer Department (WASD), a county utility serving more than 2.8 million people including the City of Miami
• Supply source. The Biscayne Aquifer through wellfields (a few wells reach the deeper Floridan), treated at the Alexander Orr Jr., Hialeah and John E. Preston regional plants
• Hardness. 175 mg/L (≈10.2 gpg), hard; regional reporting; utility publishes no figure, 2025

Utility information: www.miamidade.gov. The hardness figure is the same record shown on the Florida page.

• Drain Cleaning

  Plumbing repairs, re-piping and bathroom lavatory changeouts qualify for Miami's Easy Permit. Contractors in good standing get it by email from iBuild and start work.

• Water Heater Repair

  WASD lime-softens at its plants but publishes no hardness figure. Our 175 mg/L comes from regional reporting, and the county has not yet published its own number.

• Sewer Line Repair
• Septic Tank Pumping
• Leak Detection & Repair
• All services →

This page explains how plumbing is regulated in Miami; it is not a provider directory. For the job itself, describe the problem and your ZIP: a license-checked plumber who covers Miami gets the details and contacts you with next steps and a quote.

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