A drip that comes back usually means the real problem was never fully addressed, or something in the RV water system keeps putting stress on the faucet parts. In an RV, that can happen more often than in a house because the plumbing gets bounced around, pressure can fluctuate a lot, and cheap faucet parts wear out faster.
The first thing I’d check is water pressure. If your city water connection is running too high, or your pump is cycling hard, it can keep forcing water past a worn seal. An RV pressure regulator is worth using if you hook up to campground water, and if you already have one, make sure it’s actually working. A pressure that feels fine at the spigot can still be too much for RV plumbing over time.
If the faucet is a single-handle style, the cartridge is often the real culprit, not the washer. Many RV faucets use plastic or light-duty cartridges that can develop tiny wear spots, mineral buildup, or a crack that only leaks under pressure. If you replaced only a washer but the faucet design uses a cartridge, the drip may come right back because the actual sealing surface is still bad. In that case, replacing the whole cartridge is usually the better move.
Also look for debris in the valve. Tiny bits of scale, sand, or tape from plumbing work can get trapped inside and keep the faucet from sealing fully. When you have the faucet apart, flush the line briefly if you can do that safely, and inspect the seat, O-rings, and cartridge housing. A nicked O-ring or a scratched valve seat can cause a drip even when everything seems tight.
Another thing people miss is over-tightening. If you crank the handle shut too hard, you can compress or damage the seal and make the problem return faster. The faucet should close firmly, but not with force. If a faucet only stops dripping when you really muscle it shut, the internal parts are usually worn.
If the faucet is older or a low-cost RV fixture, replacement can be the most reliable fix. Some RV faucets just do not hold up well, especially in frequent use. A better-quality replacement with ceramic disc valves may cost more upfront, but it often saves the hassle of repeated leaks.
So the short version is: check pressure first, then identify whether your faucet uses a washer or cartridge, clean out debris, inspect the O-rings and seat, and don’t overtighten the handle. If it keeps coming back after that, replacing the faucet is often more practical than chasing the same drip over and over.
