Marietta, GA Water Heater Plumbing Codes
Marietta, GA plumbing codes for water heaters. Permits, expansion tanks, drip pans, T&P discharge, all to Georgia code.
Permits required in Marietta
Any water heater replacement or new install in Marietta needs a permit. Inside city limits, that is City of Marietta Inspections. Outside city limits in unincorporated Cobb County, that is Cobb County Development and Inspections. A licensed plumber pulls the permit. The work gets a final inspection. Yes, even a like-for-like swap needs one.
Expansion tank requirement
The Georgia State Minimum Plumbing Code requires a thermal expansion tank on any closed-loop system. Most Marietta homes with a pressure regulator on the main qualify, which is most of them. Without an expansion tank, the T&P valve drips and the water heater life shortens. Install runs $150 to $300.
T&P discharge piping
The T&P discharge has to drop within 6 inches of the floor or terminate at an approved drain. Same diameter as the valve outlet, usually 3/4 inch. Approved materials are CPVC, copper, or PEX. The end stays unthreaded. No reductions, no caps, no upward turns. Inspectors flag this on every replacement they touch.
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