Broad River canal water and Lake Murray
City of Columbia Water runs two surface water plants. The Columbia Canal Water Treatment Plant, near Riverfront Park downtown, takes Broad River water that flows down the historic Columbia Canal. The Lake Murray Water Treatment Plant, near the Saluda Dam in Irmo, draws from the big reservoir west of town. Together they serve a large area of Richland and Lexington counties, including many homes outside city limits.
Both sources are soft, typical of Piedmont rivers. Scale stays light in Columbia tanks, and tankless units can go a long stretch between descales. The flip side is that the magnesium anode inside a tank gets used up faster in soft water, and once it is gone the steel corrodes. Water temperature follows the seasons, dipping near 50 degrees in January and climbing past 80 by midsummer, so a heater that keeps up fine in summer can run short on a winter morning.
The 2015 flood
In early October 2015, a stalled storm dumped historic amounts of rain across the Midlands. Dams on Gills Creek and other streams failed, flooding neighborhoods around Forest Acres, Lake Katherine and along Devine Street and Garners Ferry Road. A breach in the Columbia Canal threatened the canal plant's raw water supply, and the city put customers under a boil-water advisory for days.
Many homes near Gills Creek and Rocky Branch lost water heaters, furnaces and ductwork in crawlspaces. If your home sits in a low area, it is worth having the heater raised or relocated during the next replacement. Treat any tank that sat in Gills Creek floodwater as suspect until a plumber has opened it up, since submerged gas controls are rarely trusted again.
Columbia homes and where the heater sits
Shandon, Wales Garden, Rosewood, Melrose Heights and Earlewood are filled with 1920s to 1950s bungalows, cottages and brick colonials built over crawlspaces. Water heaters in these neighborhoods often sit in a back hall closet, an enclosed porch, or the crawlspace itself, where the repair happens lying flat in red clay dust. Elmwood Park and Cottontown downtown have older Victorian and Craftsman homes, some divided into apartments.
Around the University of South Carolina, Five Points and the Olympia mill village hold student rentals and renovated mill houses, frequently with small electric tanks in closets. Northeast Columbia, from Sandhills to Lake Carolina and Killian Road, and the suburbs toward Irmo are mostly 1980s and newer homes with heaters in garages or attics.
The problems plumbers see most in Columbia
- Spent anodes in soft-water tanks, followed by rusty hot water.
- Crawlspace tanks that leak for weeks before anyone notices the wet clay.
- Attic heaters in newer homes that overflow a missing or clogged pan.
- Worn thermocouples and balky pilots on aging Shandon and Rosewood gas tanks.
- Short hot water in January when the river and lake water turn cold.
- Undersized tanks in student rentals near USC and Five Points.
Typical water heater prices in Columbia
| Job | Typical Columbia range | Notes |
|---|---|---|
| Thermocouple or pilot repair | $150–$300 | |
| Electric element or thermostat | $150–$350 | |
| Gas control valve | $350–$600 | |
| Anode rod replacement | $150–$300 | Worth doing on soft water |
| 40–50 gallon gas tank replacement | $1,300–$2,900 | Permit usually included |
| Crawlspace or attic tank replacement | $1,700–$3,400 | Access adds labor |
| Tankless installation | $3,000–$5,600 |
Columbia's labor costs are moderate for the Southeast. Crawlspace work in older neighborhoods and attic installs in newer homes land jobs near the high end of these ranges.
South Carolina licensing and Columbia permits
South Carolina splits contractor licensing between two boards under the Department of Labor, Licensing and Regulation. Residential plumbers register with the Residential Builders Commission, while plumbing contractors on larger and commercial work are licensed by the Contractor's Licensing Board. You can verify either on the LLR website.
Within city limits, the City of Columbia's building inspections office issues the permit for each new heater. Homes in unincorporated Richland County, including much of Northeast Columbia, are permitted through Richland County's building codes and inspections division, and Lexington County handles its own unincorporated areas.
Dominion Energy and your heater
Dominion Energy South Carolina, formerly SCE&G, supplies both electricity and natural gas in most of Columbia. Gas tanks are common in older neighborhoods with gas service, while many newer subdivisions and apartments are all-electric. Dominion has run efficiency rebates at times; see what is active before choosing a model.
Columbia's famously hot summers suit heat pump water heaters installed in garages, where one pulls heat from warm air and dehumidifies the space as a bonus. In a cramped closet or crawlspace, a standard gas or electric tank is usually the practical choice.
Getting more life out of a Columbia tank
Because the water is soft, the anode matters more than the flush here. Pull and inspect the anode around the midpoint of the tank's warranty; if it is mostly gone, a new one can add years. Drain a few gallons once a year to clear any sediment, and test the relief valve while you are there.
For crawlspace heaters, a drip pan plumbed to daylight and a simple water alarm catch leaks long before they soak the joists. In attic installs, check that the pan drain is clear before summer.
Attic heaters in Columbia summers
Builders in Lake Carolina, Woodcreek and the subdivisions off Clemson Road often put the water heater in the attic to save garage space. On a July afternoon when Columbia hits the upper 90s, those attics can top 130 degrees, which bakes plastic drain pans, dries out the rubber in shutoff valves and makes service calls miserable. A gas heater up there also needs its flue and combustion air kept clear of insulation that settles or gets blown in later. When an attic tank reaches the end of its life, some owners move it down to the garage or replace it with a wall-hung tankless unit, which frees the attic and takes the leak risk off the ceiling.
Repair or replace
Gas tanks on Columbia water typically last 9 to 12 years. If the tank is younger, a new thermocouple, element, thermostat or relief valve is money well spent. A shell leak or rust-tinted hot water means the tank is finished, and the Columbia-area replacement guide compares sizes and fuels.
Around Columbia
West Columbia and Cayce across the Congaree River operate separate water utilities and inspection offices. Lexington, Irmo, Chapin and Forest Acres each handle permits separately. Blythewood and Elgin to the northeast are growing quickly, with many homes on private wells or smaller water systems.
Water heater questions from Columbia
Where does Columbia get its water?
From the Broad River, via the Columbia Canal, and from Lake Murray. City of Columbia Water treats both at the Canal and Lake Murray plants.
Is Columbia water hard?
No, it is soft. Scale is light, but anode rods wear faster, so check the anode at the midpoint of the warranty.
Who issues water heater permits in Northeast Columbia?
Much of Northeast Columbia is unincorporated Richland County, so the county's building inspections division issues the permit.
My heater was in the crawlspace during a flood. Is it safe?
Have it inspected before use. Submerged gas controls and burners are usually replaced.
Why does my water heater run short in winter?
River and lake water drops near 50 degrees in January, so the tank has to work harder. A larger tank or higher recovery helps.
Who supplies gas and power in Columbia?
Dominion Energy South Carolina supplies both in most of the area.