Every hard freeze that rolls through Clemson brings the same question back up: does leaving a faucet dripping actually do anything, or is it an old habit people repeat without knowing why? The short answer is that it genuinely helps — but only if you’re doing it for the right reason, on the right faucet, and not confusing it with a few other freeze habits that don’t hold up.
What Dripping Actually Does
Dripping a faucet helps for two separate reasons, and most people only know one of them. First, moving water resists freezing better than standing water, since it doesn’t sit in one place long enough for ice to form as easily. Second — and more important — a slight trickle relieves the pressure buildup inside the pipe that happens when ice forms somewhere along its length. Pipes usually don’t burst at the spot where they froze; they burst because ice blocks the pipe and trapped pressure builds up between the ice plug and a closed faucet downstream, with nowhere to release. A dripping faucet gives that pressure an escape route even if a section of pipe does freeze, which is often what prevents the split from happening at all.
Doing It Right
- Drip the cold tap, not the hot. Dripping hot water does nothing extra for freeze protection and just makes your water heater work to replace the water you’re running down the drain.
- Pick the faucet farthest from where water enters the house. That gives the longest run of pipe the benefit of moving water and pressure relief, rather than a faucet close to the meter that leaves the far end of the house unprotected.
- A slow, steady trickle is enough. You’re not trying to run a stream — a thin, continuous drip does the job without wasting water overnight.
- Focus on the fixtures most at risk, like a sink on an exterior wall or one fed by a line that runs through the crawlspace, rather than every faucet in the house.
Myths Worth Retiring
“Run every faucet in the house.”
Unnecessary, and it wastes a meaningful amount of water over a multi-day cold snap. Dripping the fixtures actually at risk covers the same protection without running every tap in the house.
“A space heater pointed at a pipe is a safe fix.”
A space heater left unattended near a crawlspace or in a garage is a genuine fire risk, especially around insulation, wood framing or stored items. If a pipe needs direct warming, a hair dryer or heat cable used carefully and attended is a safer approach — and an open flame of any kind should never be used on a pipe.
“It only matters once it’s below 32 degrees.”
How long a cold snap lasts matters as much as the exact temperature. A pipe exposed to wind in a crawlspace or against an exterior wall can freeze during an extended stretch in the low-to-mid 30s, especially overnight, even though the air temperature alone wouldn’t suggest a big risk.
“Cabinet doors don’t really do much.”
They do, for the specific case of a sink on an exterior wall. Opening the cabinet lets household heat actually reach the pipe instead of being blocked by a closed door, and it costs nothing to do.
“Dripping guarantees the pipe won’t freeze.”
It significantly reduces the odds, but it isn’t a guarantee, especially on a pipe with poor insulation or heavy wind exposure. Dripping is one part of freeze protection, not a substitute for insulating exposed pipe or sealing the drafts that expose it to cold air in the first place.
If Dripping Wasn’t Enough
Dripping reduces the odds of a burst pipe, but it doesn’t guarantee one won’t happen, especially on a section of pipe with poor insulation or heavy wind exposure. If you wake up to no water, or find a wet spot that suggests a pipe has already split, shut off the main and call for leak repair right away — the faster a burst pipe gets shut off, the less water damage it does.
Freeze Prep and Leak Repair Across the Upstate
WC Plumbing & Water Treatment handles freeze-related leak repair for homes in Clemson, Pendleton, Anderson, Seneca and across the Upstate. South Carolina License CLM-114719MC. Call (864) 214-3250 or schedule a freeze-prep check.
