Once a year suits most homes. An annual look catches corroding fittings, weeping valves, early drain restriction, and water heaters approaching the end of their service life while those problems are still small and cheap.

Find the main shut-off where the service line enters, often near the front hose bib, in a crawl space, or beside the water heater. Turn it clockwise until it stops. Learn its location before you ever need it.

Above 80 psi, code requires a pressure-reducing valve for good reason. Excess pressure blows out supply hoses, splits fixture cartridges early, and creates pinhole leaks in copper long before the pipe would otherwise fail.

A pressure-reducing valve on the incoming service is the correct fix. Where one already exists, it can be adjusted or rebuilt. We gauge the static pressure first, because guessing at that number helps nobody.

Copper and PEX dominate current work. Older homes around here still carry galvanized steel or polybutylene supply, along with cast iron and clay drainage, and each material has its own failure pattern and remaining life.

Water service is generally 3/4 inch minimum, with half-inch branches feeding individual fixtures. Drains run 1.25 to 2 inches at fixtures and 3 or 4 inches for the main line.

Sometimes. A single sharp bang when a valve closes is water hammer, and repeated hammering fatigues joints over time. Constant knocking typically means loose strapping or high pressure, both of which are worth correcting.

Start with pressure. If static pressure is high, a pressure-reducing valve solves it. Otherwise the fix is arrestors near fast-closing appliance valves, and resecuring any pipe that has worked loose from its hangers.

Watch for white scale on aerators, cloudy glassware, soap that will not lather, and shortened water heater life. Smithfield's Neuse River supply runs relatively soft, so scale here often points to a private well instead.

At household concentrations it is mostly a nuisance, but it should never be ignored. Sewer gas signals a dry trap, a failed wax seal, or a venting problem, and sustained exposure causes headaches and nausea.

Traps hold a 2 to 4 inch water seal. Guest bathrooms and floor drains that go unused let that seal evaporate, so odor appears, then disappears once someone runs the tap again.

Caustic cleaners generate heat, sit against the blockage, and attack older pipe and rubber seals while doing it. They also rarely reach a clog in the main line, which is where recurring problems usually live.

Mechanical clearing. A properly sized cable or a jetter removes the material rather than partially dissolving it, and a camera afterward shows whether the pipe itself caused the blockage in the first place.

They can, and that is exactly the risk. Thawing ice releases pressure into a pipe that may already be split, so the flooding starts when the weather improves rather than during the freeze.

On electric units, a tripped breaker or a failed upper element is most common. On gas, check for a pilot or ignition fault. A sudden change commonly points to a component, not a worn-out tank.