When to Replace Hoses, Water Heaters and Supply Lines

Here is an uncomfortable fact about our trade: a large share of the residential flooding we clean up was caused by components that cost a few dollars and had visible, predictable service lives.

The reason they fail is not that they are badly made. It is that nobody knows how old they are, so nobody replaces them until they let go.

The replacement schedule

Why supply lines fail

They are pressurized continuously, not just when the fixture is in use. A supply line under your sink is holding mains pressure every second of every day for years, and it fails when the material can no longer do that.

Rubber hoses perish — they harden, crack, and blister, and because they sit behind machines nobody moves, the warning is never seen. Braided stainless lasts longer but eventually frays at the crimp where the braid meets the fitting, and plastic ice maker lines become brittle.

Write the date on it

This is the single most useful habit in this entire article, and it costs nothing.

When you fit a new hose, supply line, or angle stop, write the month and year on it with a permanent marker. Nobody remembers when they last did this, and that uncertainty is exactly why components stay in service for twenty years — the homeowner is not being negligent, they genuinely have no way to know.

Same for the water heater: note the manufacture date from the serial plate somewhere you will find it again.

Water heaters specifically

Ten to twelve years is typical service life in this region's water conditions, and tanks rarely fail gracefully. The signs that yours is close:

• Any water pooling at the base — usually means the inner tank has already corroded through
• Rust along the bottom seam of the tank
• Rusty or discolored hot water
• Popping, rumbling or knocking as it heats — that is sediment
• Hot water running out faster than it used to
• Water discharging from the temperature and pressure relief valve

Flushing annually and replacing the anode rod extends service life meaningfully. Both cost far less than a garage flood — and in Downey, where nearly every tank sits in a garage against the wall shared with the living space, that flood reaches your bedroom drywall whether you notice or not.

What to do while you are in there

If you are replacing a water heater, get three things done at the same time. Two seismic straps anchored into framing, upper third and lower third — this is required by California Health and Safety Code section 19211, and it applies to existing heaters as well as new ones. A drain pan under the tank. And a drain line from that pan routed somewhere other than your garage floor, because a pan with no line just holds a few gallons before overflowing.

For landlords and property managers

Across our rental-heavy service areas — Norwalk, Paramount, Lynwood — a disproportionate share of the floods we attend are these exact components in tenanted property. Tenants do not own the plumbing, do not move the washing machine, and would not recognize a bulging hose.

Building this into turnover is the highest-return maintenance available. An afternoon per unit, a few dollars in parts:

1. Replace washing machine hoses with braided stainless, dated
2. Replace supply lines under every sink and toilet if over seven years or unknown
3. Test every angle stop actually turns, and replace any that seize
4. Record the water heater manufacture date and plan replacement at ten to twelve years
5. Confirm water heater straps are present, doubled, and anchored into framing
6. Note it all on a sheet so the next turnover knows what was done and when

The upgrade worth considering

For a house that sits empty during the working day, a leak sensor with an automatic shut-off valve on the main is the most effective single device you can install. Water hits the sensor, the valve closes, and the flood stops at a few gallons instead of a few hundred.

It does not replace the maintenance above — it catches the failure you did not anticipate.