Leak, no hot water or strange noise: sort the symptom
A puddle under the tank, water dripping from the relief valve pipe, no hot water at all, hot water that runs out quickly and popping or rumbling sounds point to different causes. A leak from the tank body usually means the tank has failed. Water from the temperature and pressure relief valve can mean too much pressure or temperature, which is a safety device doing its job. Lukewarm water may be a failed element, thermostat or gas control. Write down what you see so the plumber can arrive with the right parts.
Safe shutoff for gas and electric tanks
For an electric water heater, switch off its breaker at the panel, but only if the floor around the panel is dry. For a gas water heater, turn the control knob to pilot or off as the manufacturer label describes. Close the cold-water inlet valve on top of the tank to stop more water from entering. Do not drain a tank full of very hot water, and do not tamper with the burner, venting or gas line. If you smell rotten eggs, leave the house and call 911 and Columbia Gas of Ohio from outside.
Columbus water hardness and sediment
Columbus softens drinking water at its plants to a target of about 7 grains per gallon, which the city describes as a moderate hardness recommended by Ohio EPA. The 2024 city report listed roughly 7.2 grains at the Dublin Road plant, 5.3 at Hap Cremean and 7.1 at Parsons Avenue. Moderately hard water still leaves mineral scale in a tank over the years, and sediment on the bottom is a common cause of rumbling noises and slower heating. Ask the plumber whether a flush, an anode check or replacement makes sense for your tank's age.
Which Columbus water plant serves you
The city's 2025 water report says homes in the greater Columbus area are served by one of three plants. Dublin Road draws from the Griggs and O'Shaughnessy reservoirs on the Scioto River and serves northwest and southwest areas. Hap Cremean draws from Hoover Reservoir on Big Walnut Creek and serves Ohio State and northern areas. Parsons Avenue draws from wells. Knowing your plant helps explain the hardness value a plumber may quote.
Repair or replace: questions to ask
Ask the plumber for the tank's age from its rating label, the exact part that failed, the cost of repair against replacement, and whether the replacement is the same fuel, size and venting. Tankless and heat pump units can need new venting, gas line sizing, a condensate drain or electrical work, so the scope can grow. Get the written price, the warranty terms offered by the manufacturer and installer, and the removal fee for the old tank before you agree.
Columbus permit rules for a new water heater
The City of Columbus lists replacing a hot water tank as work that requires a permit but not plan review. City code allows a plumbing permit to be pulled by a registered plumbing contractor holding an Ohio OCILB license or by an occupying homeowner, and the city schedules the inspection. Code 4113.61 also exempts mending a broken water heater from a permit, so a simple repair may not need one. Ask who will pull the permit before work begins.
The relief valve is a safety device
Every tank water heater has a temperature and pressure relief valve with a discharge pipe that runs toward the floor. If water or steam is coming out of that pipe, do not cap or plug it. Shut the heater down as described above and let a plumber find out whether the cause is excess temperature, high water pressure or a worn valve.
Suburban addresses
Suburbs such as Dublin, Westerville and Worthington handle their own permits. Confirm the right building department for your street before a tank is swapped.
Before you call
- 1Cut power at the breaker or set a gas control to pilot or off, then close the cold-water valve on top of the tank.
- 2Keep children and pets away from hot water and never open a gas burner compartment or venting yourself.
- 3Find the age and size on the rating label and photograph it before calling.
- 4Ask for repair and replacement prices in writing, including permit, haul-away and any venting changes.
Common homeowner questions
Is hard water a problem for water heaters in Columbus?
Columbus softens its water to about 7 grains per gallon, a moderate level. That still leaves some scale and sediment over time, which can cause rumbling sounds and slower heating. Periodic flushing and anode checks can help; ask a plumber what fits your tank.
Do I need a permit to replace a water heater in Columbus?
Yes. The city lists replacing a hot water tank as work that needs a permit but not plan review. A registered plumbing contractor or an occupying homeowner can pull it, and the city inspects the installation.
What should I do if I smell gas near my water heater?
Leave the house immediately without using switches or phones inside, then call 911 and Columbia Gas of Ohio from a safe place. Do not try to find the leak or relight the pilot.
How fast can someone replace my water heater?
That depends on the provider you are connected with, the parts they have and the permit timing. Ohio Service Hub does not set or promise arrival times or install dates.
Government and primary-source references
- City of Columbus — Typical Residential Projects permit guide (2026)
- Columbus City Codes Chapter 4113 (§ 4113.61 Plumbing permit) — Municode
- City of Columbus — Home water treatment devices and plant softening
- City of Columbus — 2025 Water for Living consumer confidence report
- Columbia Gas of Ohio — How to recognize a gas leak
- Ohio Construction Industry Licensing Board
External references support general guidance. They do not verify any specific contractor or provide a booking.