Gas is the one utility in your house that does not give you a second chance to ignore it. A dripping faucet wastes water. A failing gas line risks the building. If you smell rotten eggs near your range, your water heater or the meter on the side of the house, stop reading, get everyone outside, and call the gas company from down the street.
Everything below is for the situations that are less obvious than that — the slow problems Charleston homeowners live with for months without realizing what they are looking at.
Why Charleston is hard on gas lines
Three things about the Lowcountry work against buried and exposed gas piping.
Salt air. If you are anywhere near the harbor, the Ashley, the Cooper or the marsh, salt is in the air every day. Exposed black iron pipe and the fittings at the meter corrode from the outside in. On Sullivan’s Island, Folly Beach and Isle of Palms we see surface rust on gas piping that would take twice as long to appear inland.
Soil that moves. Much of the peninsula and the surrounding neighborhoods sit on soft, high-water-table ground. Soil that settles and shifts puts steady mechanical stress on buried lines and on the joint where the line comes up out of the ground — which is exactly where most residential gas leaks start.
Old houses with new appliances. A downtown single house or a 1940s bungalow in West Ashley may still be running the pipe that was installed for a single gas range. Add a tankless water heater, a gas dryer, a range and a fire pit, and that pipe is now undersized. Undersized gas piping does not leak — it starves. The symptoms look like appliance problems, so people replace the appliance instead.
The warning signs worth acting on
You smell sulfur or rotten eggs
Natural gas and propane have no natural odor. The rotten-egg smell is mercaptan, added specifically so you can detect a leak. If you smell it: do not flip switches, do not use your phone indoors, do not light anything. Get out, then call. This is the one gas symptom with no acceptable wait time.
Your burner flame is yellow or orange instead of blue
A healthy gas flame burns crisp blue. Yellow or orange flames, or flames that lift away from the burner, mean the fuel-to-air ratio is wrong. That is often a supply pressure or line sizing issue, and it produces more carbon monoxide than a correctly burning appliance.
Appliances stop keeping up when several run at once
The classic version: someone starts the dryer, and the shower goes cold. A gas tankless water heater needs a large, steady volume of gas. If the line cannot deliver it while other appliances draw, the unit throttles or drops out. Before you replace a "bad" water heater, have the gas line sized. We see this often enough that it is worth checking first — the same logic applies to the symptoms covered in our guide to what to check when there is no hot water.
Dead grass or bubbling in standing water outside
An underground leak kills vegetation in a patch above the line. After a Lowcountry downpour, a buried leak can also show as steady bubbling in a puddle over the run. Both are worth a same-day call.
Visible rust, scaling or a hissing sound at the meter
Walk the exposed piping once a season. Surface rust is manageable. Flaking, pitting or scale that comes off in your hand means the wall thickness is compromised. Any audible hiss near a fitting is a leak until proven otherwise.
What a proper gas line repair actually involves
Gas work is licensed work in South Carolina, and it is inspected for a reason. A real repair follows a sequence:
- Isolate and shut off at the appropriate valve.
- Locate the leak with a combustible gas detector and, where needed, a soap solution on the joints — not by guesswork.
- Pressure test the system to find out whether you have one bad fitting or a line that is failing along its length.
- Repair or replace with correctly sized, code-compliant material. Sometimes that is one union. Sometimes it is a full re-run.
- Re-test, then relight and verify every appliance on the system, checking the flame at each one.
- Permit and inspection where the scope requires it.
If a quote skips the pressure test, you are paying someone to guess.
Before hurricane season gets serious
Midsummer is the sensible time to deal with gas work in Charleston, and not only because nobody wants to be without hot water in August. Standby generators and gas ranges are exactly what people want working when a storm knocks the power out — and August through October is the worst possible time to discover the line feeding them is undersized or corroded. If you are having a generator connected, have the whole gas system evaluated at the same time rather than adding load to piping nobody has looked at in twenty years.
Talk to a licensed Charleston gas plumber
Charles Towne Plumbing handles natural gas and propane line service across the Charleston metro — leak location, repair, resizing, appliance connections and new runs. If it is urgent, we also run emergency plumbing service.
Suspect a leak right now? Leave the building first, then get in touch. Gas is not a wait-and-see repair.
