Fall Plumbing Maintenance Checklist for Treasure Valley Homes

Fall is the best time to handle plumbing problems before they turn into winter emergencies. Once temperatures drop, a small leak can freeze and split a pipe; a slow drain can back up your septic system; outdoor faucets can burst. At Mountain Time Plumbing, we see the same preventable problems year after year when homeowners skip fall prep. Here's the checklist we recommend for every Treasure Valley home before November hits.

The 15-Minute Fall Plumbing Walkthrough

1. Check All Exterior Faucets for Leaks and Frost-Free Bibs

Walk around the outside of your house and turn on every hose bib (outdoor faucet). Look for:

Dripping or steady leaks, at the spout, the connection point, or the base where the stem enters the wall.

Old or corroded faucets, — if it's original to the house or you can't remember the last time you thought about it, it's probably frost-free bib material that will fail if the line freezes.

Poor drainage, underneath the bib — the ground should slope away from the house so water doesn't pool there.

A single leaking hose bib runs water into your wall cavity all winter. The result is ice, burst pipes, and thousands in water damage inside. If any bib leaks, call us for a quick replacement. If they're original to a pre-1995 house, consider replacing them preemptively with modern frost-free bibs.

2. Disconnect and Store Garden Hoses

Even if the bib itself doesn't leak, a connected hose traps water inside it. When temperatures drop below freezing, that water expands and can migrate back into the wall, freezing the bib and the supply line behind it. Disconnect every hose, drain it completely, and store it in a garage or shed for winter.

3. Inspect the Main Water Shutoff Valve

Locate the main shutoff valve (usually in the basement, crawlspace, or a utility closet near where the water line enters the house). This is the one thing you pray you never need until you need it in an emergency.

Turn the valve handle slowly to make sure it operates smoothly., If it's stuck or corroded, call us now while it's not an emergency. A stuck valve when a pipe bursts is its own disaster.

Tag it with a bright sticker or mark it clearly, so anyone in the household can find it in the dark during a leak. Write the direction (left/counterclockwise = off) if you have kids or roommates.

Know which isolation valves feed which fixtures., If you have isolation valves on the hot-water tank, the toilet, under the kitchen sink, or anywhere else, test those too.

4. Look Under Every Sink for Leaks and Corrosion

Open cabinet doors and look at the underside of every sink, including the back of the vanity if the pipes run there.

Check for:

Active drips, from the faucet body, handles, or connections — fix these now before they freeze.

Staining or discoloration, on the cabinet floor or wood, a sign of past or present leaks. If it smells like mold, the leak has been there a while.

Crystalline white buildup, on copper fittings — this is corrosion starting and it's a freeze risk.

Kinked, crushed, or split supply lines, (often plastic, sometimes rubber). These fail without warning.

5. Check for Exposed Pipes in Unheated Spaces

Walk into the garage, basement, crawlspace, or attic and look for water supply lines running through those spaces.

Pipes with no insulation in an unheated room are at risk., Wrap them with foam pipe insulation sleeves (available at any hardware store) or install heat tape on the coldest-facing walls.

Pay special attention to pipes running through exterior walls,, particularly the north and west sides of the house. These freeze first.

If you have a washing machine in the garage,, the inlet hoses run through cold space — wrap them or consider a timer-controlled freeze guard.

6. Inspect Basement and Crawlspace for Standing Water or Damp Spots

Before water gets into your plumbing, it pools around the foundation. Walk your basement or crawlspace and look for:

Wet spots on the floor, or the walls

Efflorescence, (white mineral crusting) on concrete or foundation blocks — sign of water seepage

Musty or moldy smells, — a water management problem

Cracks in the foundation, where water could enter (large ones are worth a pro inspection)

A lot of water seepage happens in fall when rain increases and the water table rises. Early detection prevents winter flooding and protects your heating system, electrical panel, and finished space.

7. Test Sump Pump and Drainage if You Have Them

If your home has a sump pump or a drain system:

Pour water into the sump pit, and verify the pump activates and runs, and the water level drops.

Check that the discharge line is clear, and runs away from the house foundation, not back toward it.

Look for cracks or clogging, in the drain tiles if they're visible.

Sump pumps fail silently over the summer. Testing in September catches a dead pump before water fills your basement in October.

8. Clear Gutters and Downspouts

Clogged gutters overflow, and overflowing water runs down the exterior walls and pools around the foundation. That water can seep into the basement or crawlspace and damage plumbing, foundation, and finishes.

Clean gutters of leaves, sediment, and debris.

Check that downspouts extend at least 4–6 feet away from the house, and aren't clogged.

Run water through them, to confirm flow. If water backs up, there's a blockage downstream.

9. Inspect the Water Heater for Corrosion and Leaks

Take a flashlight into the basement or utility room where your water heater lives.

Look for:

Rust staining, on the tank or on the floor around it — a sign of internal corrosion or a slow leak.

White mineral scale, on or around the heater — sign of hard water buildup inside (common in the Treasure Valley, and it shortens heater life).

The temperature and pressure relief valve, — there should be a drain line running from it; make sure that line isn't clogged or kinked.

The age of the heater, — if it's over 8 years old and you haven't had it serviced, you're on borrowed time.

If your water heater is original to the house or over 10 years old, call for a free assessment. We can tell you whether it's worth maintaining through winter or time to plan a replacement.

10. Flush the Water Heater Tank

Over time, sediment builds up on the bottom of your water heater tank. This sediment insulates the burner from the water, forcing the heater to work longer and harder, wasting energy and shortening the tank's life.

If you're comfortable with basic plumbing:

Turn off the power (gas or electric) to the heater.

Attach a garden hose to the drain valve at the bottom of the tank.

Run the hose to a floor drain or outside, and open the valve.

Let several gallons drain (until the water runs clear) to flush out sediment.

Close the drain valve and turn the power back on.

If you're not comfortable doing it yourself, we flush water heater tanks across Treasure Valley as part of routine maintenance. It's inexpensive and adds years to the heater's life.

11. Have a Plumber Inspect and Clean Main Drain and Vent Pipes

This is the one task most homeowners skip, and it's the one that catches hidden problems before winter.

A blocked or slow main drain, backs up into multiple fixtures when it freezes. Snow loading on the roof can collapse vent pipes.

A camera inspection, (costs $300–$500) shows exactly what's happening inside the line. You get video, not guesses.

We've prevented emergency backups, for dozens of Treasure Valley homes this way. A single preventative flush is far cheaper than cleanup from a 4 a.m. sewage backup.

12. Check Toilet Flapper and Fill Valve for Leaks

Toilets are the most common source of hidden water waste. A slow leak in the tank wastes hundreds of gallons and runs up your bill.

Fill the tank, then turn off the water supply valve, (the valve where the water line enters the toilet, usually under the sink).

Wait 30 minutes., If the water level drops, the flapper is leaking and needs replacement (inexpensive DIY or pro fix).

Lift the tank lid and look inside, for mineral scale or mineral-stained water, a sign of hard water or a corroded valve.

A running toilet isn't an emergency, but it is an efficiency problem that costs real money through winter.

13. Inspect Supply Line Shutoff Valves Under Sinks

The small valve where the supply line connects to the faucet can corrode or stiffen from disuse. Test them now:

Turn each shutoff valve handle slowly, to confirm it closes easily and stops the flow. If it's stuck or leaking, it needs replacement.

Some homes have no shutoff under the sink,, meaning if the faucet or line fails, you have to run to the main valve. Consider adding them.

14. Check Basement Rim Joists and Walls for Cracks

Water can seep through cracks in the foundation, rim joists, and band boards, especially when snow loads and frost heave create pressure. Walk your basement and crawlspace looking for:

New or widening cracks, in concrete or cinder block

Gaps between the rim joist and the foundation, where water or cold air enter

Deteriorating mortar, between foundation blocks

Large cracks are worth a professional inspection. Small ones can be sealed with hydraulic cement or caulk.

15. Review Your Plumber's Contact Information

Before an emergency happens at 2 a.m. on a Sunday in January, save the number. Treasure Valley homes that call ahead in September get scheduled in October when we have availability. Homes that call at 4 a.m. during a freeze wait for hours or days while the damage spreads.

Keep Mountain Time Plumbing's number handy: (208) 993-0717. We respond to emergencies same-day, and our after-hours service line is available. Know whether you've had a plumbing inspection in the last 3 years, and call us in early fall if you haven't.

When to Call a Professional

Do-it-yourself checks catch maybe 70% of problems. The rest need a plumber's eye. Call us if:

Any shutoff valve won't turn,, or leaks when opened

You find active water leaks, under sinks, around the water heater, or in the basement

You notice rust-stained water,, discolored staining on floors or walls, or musty odors

Your water pressure has dropped, or is uneven between fixtures

You haven't had the main drain or sewer camera-inspected in 3+ years

Your water heater is over 8 years old, and has never been serviced

A $95 diagnostic visit now can prevent a $3,000+ emergency repair after a freeze. That's the math of fall plumbing prep.

Get Your Inspection Scheduled

Mountain Time Plumbing offers fall plumbing inspections, water heater flushes, and weatherization work across the Treasure Valley. We serve Boise, Meridian, Eagle, Kuna, Nampa, Caldwell, Star, Garden City, and surrounding communities.

Call (208) 993-0717 or book online to schedule your inspection before the rush. The earlier you book, the sooner we can catch and fix problems before winter.

Don't wait for the freeze. Call us today.

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