Oklahoma City's water supply
Oklahoma City Utilities treats water at two main plants. The Lake Hefner plant draws from Lake Hefner and Lake Overholser, which are fed in part by Canton Lake upstream on the North Canadian River. The Draper plant draws from Lake Stanley Draper, which receives water piped from Atoka and McGee Creek reservoirs in southeastern Oklahoma. These sources differ, and the water that reaches your home is generally moderately hard, with some variation by neighborhood.
That hardness is enough to build sediment in a tank over a few years. A flush every year or so keeps most Oklahoma City tanks quiet, and tankless units usually need a yearly descale. Homes in the outer parts of the metro on private wells may have much harder water, sometimes with iron or sulfur.
Slab homes, garages and attics
Basements are rare in Oklahoma City, so water heaters sit in garages, utility closets and attics. Post-war and 1960s through 1980s neighborhoods across the north and south sides, such as Warr Acres, Capitol Hill and much of northwest OKC, typically have the heater in the garage or a hall closet. Newer subdivisions in far northwest OKC, Edmond, Yukon and Mustang often have two-story homes with attic installs, where a leaking tank threatens the ceiling below.
Older neighborhoods closer to downtown, such as Heritage Hills, Mesta Park, Crown Heights and the Paseo district, have early twentieth century homes on pier-and-beam foundations or with small basements, where heaters may sit in a utility room, a back porch enclosure or under the house.
Heat, ice and tornado season
Oklahoma City summers are long and hot, and attics regularly pass 130°F. Heat ages plastic drain pans, gas control valves and relief valves in attic installs, and an attic pan that has cracked will not catch a leak when it matters. Garages get hot too, which pulls in dust and stresses components.
Winter brings ice storms and hard freezes that can freeze supply lines in attics, exterior walls and crawlspaces. Power outages during ice storms also stop tankless units and power-vent heaters, while a standing-pilot gas tank keeps producing hot water. After a hard freeze, check around the heater and its lines for water before assuming all is well.
Spring storm season occasionally brings hail, wind damage and flooding. If a garage floods and water reaches a gas water heater's burner or controls, the heater should be inspected before it is relit, and is usually replaced.
The problems plumbers see most in Oklahoma City
- Attic tank leaks and failed drain pans in two-story homes.
- Sediment rumbling in garage tanks that have not been flushed.
- Pilot and burner trouble from dust and lint in garages.
- Freeze damage to lines near attic and exterior heaters after ice storms.
- Relief valves dripping in attics where summer heat and pressure stress them.
- Tankless units losing scale battles on harder well water outside the city.
Typical water heater prices in Oklahoma City
| Job | Typical Oklahoma City range | Notes |
|---|---|---|
| Thermocouple or pilot repair | $150–$300 | |
| Flush and sediment clean-out | $100–$250 | |
| T&P valve replacement | $150–$325 | |
| Attic drain pan and line | $200–$425 | |
| 40–50 gallon gas tank, garage | $1,300–$2,800 | Permit usually included |
| 40–50 gallon gas tank, attic | $1,700–$3,200 | Ladder access adds labor |
| Tankless installation | $2,900–$5,600 |
Oklahoma City prices are among the more affordable for a large US city. Attic installs and older pier-and-beam homes near downtown sit at the higher end of each range.
Permits and licensing in Oklahoma City
Oklahoma licenses plumbers through the Construction Industries Board, which keeps an online license lookup. The City of Oklahoma City's Development Services department requires a permit for water heater replacement, with an inspection covering the gas connection, venting, relief valve discharge and, for attic installs, the drain pan. Edmond, Norman, Moore and other suburbs issue their own permits.
Confirm the plumber's Oklahoma license and that the city permit is included before agreeing to a replacement.
Choosing a replacement in Oklahoma City
For most Oklahoma City homes, a 40- or 50-gallon gas tank remains the simplest and most affordable replacement. If your current tank is in the attic, replacement time is the chance to move it to the garage or switch to an exterior tankless unit, which removes the risk of a ceiling flood. Relocation costs more up front because water, gas and venting must be rerouted.
Tankless units do well here when they are sized properly and descaled yearly, but they need power to run, which matters during ice-storm outages. Heat pump water heaters work well in Oklahoma garages for most of the year, and OG&E has offered efficiency incentives at times.
Maintenance that pays off in Oklahoma City
A short yearly routine keeps most Oklahoma City heaters healthy. Flush the tank once a year to clear sediment before it hardens. Look at the drain pan under an attic heater and pour a little water into it to confirm the drain line flows. Test the relief valve by lifting its lever briefly, and replace it if it drips afterward. Keep the area around a garage heater clear of stored items, lint and chemicals.
Around the fifth birthday of the tank, ask a plumber to pull the anode rod. On moderately hard water it is often still in decent shape by then, but if it is down to bare wire, replacing it can add years to the tank. Write the service date on a tag on the heater so the next visit is easy to plan.
What to do in an ice storm
If an ice storm knocks out power and heat for more than a day, the risk to your water heater is mostly the pipes around it. Let a faucet drip on the coldest nights, open cabinet doors on exterior walls, and know where the main shutoff is. If a line near the heater bursts, close the main, turn the heater's gas to PILOT or switch off its breaker, and call once it is safe. A tankless unit on an outside wall should be drained if power will be out through a hard freeze; ask your plumber to show you how before winter.
Around Oklahoma City
Edmond to the north has many newer two-story homes with attic or garage heaters and its own water utility. Norman to the south, home to the University of Oklahoma, mixes older neighborhoods with new subdivisions and draws partly on groundwater, which is harder. Moore, Yukon and Mustang grew quickly in recent decades, and many of their original heaters are reaching the end of their lives.
Water heater questions from Oklahoma City
Is Oklahoma City water hard?
It is moderately hard, varying by which treatment plant serves your area. Homes on wells around the metro can be much harder.
Do I need a permit to replace a water heater in Oklahoma City?
Yes. The city's Development Services department requires a permit, and the work should be done by an Oklahoma-licensed plumber.
Why does my attic water heater keep dripping from the relief valve?
Summer attic heat and high water pressure can make a T&P valve weep. Have the valve replaced and the pressure checked, and make sure an expansion tank is installed.
Will my water heater work during an ice storm power outage?
A standing-pilot gas tank usually keeps working. Tankless units and power-vent heaters need electricity and will stop.
Should I move my attic water heater to the garage?
If the attic tank needs replacing, relocation removes the risk of ceiling damage. It costs more up front because water, gas and venting lines must be rerouted.