People move to Ewa Beach or Ko Olina and expect the ocean to do something to their car. Nobody warns them about the spigot on the side of the house.

Salt spray does not stay at the shoreline. Trade winds carry it well inland, which is why homes a mile or two from the water still get the white haze on windows and the chalky film on window screens. That same film settles on every piece of metal plumbing on the exterior of your house. Salt is hygroscopic, meaning it pulls moisture out of the air and holds it against the surface, so the metal underneath stays damp long after a rain has dried off everything else. Corrosion that would normally slow to a crawl just keeps going.

The hose bib is the first thing to go

Look at the spigot on the ocean-facing side of your house. If it has a green or blue-green crust around the handle and where the body meets the wall, that is copper corroding out of the brass. A little surface color is normal on any exterior fitting. A crusty buildup you can flake off with a fingernail means the reaction has been running a while.

What that costs you shows up in three ways. First the handle gets stiff, then it needs two hands, then one day it will not budge at all. That is the packing nut and the stem seizing together inside. Second the bib starts weeping from under the handle every time you use it, because the packing washer has given up and the stem is scored. Third, and this is the one that gets expensive, somebody puts real force on a seized handle and snaps the stem clean off inside the body.

Understand what that means on a slab home. The bib threads into a pipe that runs through your exterior wall, and if the stem breaks with the valve partly open, you have pressurized water inside the wall cavity with no way to stop it short of the main. We take those calls. They are worse in older Ewa and Waipahu houses where the bib was installed on galvanized nipple and the two metals have been fighting each other for thirty years.

The prevention is comically simple. Open and close every exterior valve fully twice a year. A valve that gets exercised does not seize. One that sits in the same position for six years does. When one already fights you, replace it while the house still has water, not after it does not.

Green on the exterior copper runs

Plenty of West Oahu homes have copper running along an outside wall to reach a heater closet, an outdoor kitchen, a laundry area or a second-floor bath. Sometimes it is bare, sometimes wrapped in insulation that stopped doing anything years ago.

Walk the runs and look at the joints rather than the straight pipe. Soldered fittings are where different metals meet, and that is where salt does its best work. Green streaking that runs downward from a fitting is telling you moisture has been sitting there. A white or pale crust at a threaded connection is a different reaction, usually at the point where copper meets a steel or galvanized fitting.

Pipe strapped tight to a stucco or block wall is the worst case, because the contact point never dries and you cannot see the back side. Standoff straps that hold pipe a half inch off the wall are worth asking for on any exterior work, and wrapping a run in a proper jacket beats leaving bare copper in the wind.

A pinhole in an exterior run does not announce itself the way an indoor leak does. It sprays into landscaping or drips down a foundation and the first sign is a water bill nobody can explain. When the number moves and nothing inside looks wrong, the outside of the house is worth a careful look, and that is where our leak detection visits often end up.

Heater closets and anything mounted outdoors

Plenty of houses here put the water heater in an exterior closet or hang a tankless unit on an outside wall. That is a sensible use of space in our climate. It also means salt air is circulating around the unit every hour of every day.

What we find is corrosion on the flexible connectors at the top, on the gas shutoff and its fittings, and on the mounting hardware. Louvered closet doors let the wind through, which the unit needs for combustion air but which also delivers salt straight to the connections. On tankless units the exterior cover takes the visible beating while the vent hardware and the fasteners quietly deteriorate behind it.

Gas connections in salt air deserve particular attention, since a corroded fitting is a safety issue rather than a maintenance annoyance. If you smell gas near an outdoor unit, leave it alone and call. Corroded fittings and old flex connectors are common work on our gas line repair calls out here, and it is not something to hand a wrench to yourself.

The outdoor shower nobody thinks about

Rinsing off outside is one of the genuinely great things about living here. It is also the plumbing feature that leaks the longest before anybody notices, for a straightforward reason: the whole area is supposed to be wet.

The valve body sits inside the wall, and when its seals fail the water has nowhere obvious to go, so it runs down inside the framing. On a stucco wall the sign is a dark stain that never dries, or paint blistering low on the wall, or a mushy spot in the drywall on the inside of that same wall. On a freestanding post you get a soft or sinking base.

Two more things worth checking on any outdoor shower. The drain, which usually goes to a small gravel pit rather than the sewer, and which fills with sand and hair until water starts pooling and finding the foundation instead. And the mixing hardware, since salt corrodes the internals of an outdoor valve much faster than the same valve indoors. A shower that suddenly runs only hot or only cold has usually lost a cartridge to corrosion rather than to age.

Backflow devices in coastal air

If you have irrigation, there is a backflow prevention device somewhere between the water supply and the sprinkler lines. Its job is to keep water that has been sitting in irrigation pipe from being drawn back into your drinking water. It is usually brass, usually above ground, and usually completely ignored.

Those devices have internal springs, seats and rubber checks, and salt air gets at all of them. A device that dribbles constantly from the relief opening is telling you a check has failed. Sometimes it is debris, sometimes the internals are corroded, and either way it is not something to plug or cap.

Look at it once in a while, keep it clear of soil and mulch piled against the body, and if it sits where a sprinkler head sprays it directly, move the head. Constant wetting plus salt is a fast way to ruin brass.

What actually survives out here

Material choice matters more on an exterior wall than anywhere else in the house.

On brass, the thing to look for is dezincification-resistant brass, sometimes labeled DZR or low-lead. Regular brass in salt air loses zinc out of the alloy over time, which leaves a pink, porous, weak metal that looks fine until it snaps. It is worth asking what a fitting is made of before it goes on the ocean side of your house.

Stainless is not automatically the answer. Lower grades will pit and rust-stain in coastal air, so a cheap stainless bracket can look worse in two years than the brass fitting next to it.

And there are places where plastic is smarter than metal, which surprises people who assume metal is always the upgrade. PVC and CPVC do not corrode at all, which makes them a good fit for irrigation, for backflow assembly downstream piping, and for hose bib supply where code allows. The tradeoffs are UV exposure, since sunlight makes unprotected PVC brittle, and impact resistance. Painted or sleeved and out of direct sun, plastic outlasts brass in a lot of exterior spots.

Where metal has to be there, a light coat of paint or a corrosion-inhibiting spray on exposed fittings goes a long way. Not on threads you may need to break loose later, and never on a gas connection without asking first.

The twice-a-year walk-around

Put it on the calendar with something you already do, like changing the smoke detector batteries. It takes about twenty minutes.

Start at the hose bibs and open and close each one fully, listening for weeping around the handle. Follow any exterior pipe runs and check the fittings for green streaking or white crust. Look at the water heater closet or the outdoor unit, especially the connectors and the gas shutoff. Check the outdoor shower for a stain that will not dry and a drain that will not clear. Find the backflow device and see whether it is dribbling. Then look at the ground: a patch of grass that is greener than everything around it, or soil that stays damp with no sprinkler nearby, is worth mentioning.

Most of what you find will be small, and a lot of it you can handle yourself. The point is catching a seized bib in March instead of meeting it in an emergency in December. When something is already past the point of a homeowner fix, or you find water where there should not be any, our emergency plumbing line is answered by the same crew that would come out anyway.

We would rather look at a stiff spigot on a calm afternoon than open a wall on a holiday weekend. Send us what you found on your walk-around and we will tell you what needs doing now and what can wait.