Plumbing Maintenance for a New Homeowner

You just got the keys, and somewhere behind those walls is a plumbing system you have never met. The previous owner knew where the water shutoff was, how old the water heater was, and which fixture had been quietly dripping for two years. You inherited all of it and none of that knowledge. The first weeks in a new house are the right time to fix that gap, because the cheapest plumbing problem is the one you find before it becomes a flood.

This guide is about discovery, not routine. The goal in your first 90 days is to learn the house: find the controls, take inventory of what you actually own, spot the risks an inspection may have glossed over, and knock out a few low-effort wins. Once you know your system, you can hand yourself off to an ongoing schedule. That ongoing year-round calendar lives in our guide on a year-round home plumbing maintenance checklist (177), and the season-by-season task lists live in our guides on plumbing tasks to do before winter (178) and spring and summer plumbing maintenance tasks (179). Start here first.

The First Week: Find Every Shutoff and the Main Valve

Locate your main water shutoff before anything else, because it is the single control that lets you stop a flood in seconds. In most US homes the main valve sits where the water line enters the house: near the water meter, on an interior wall in the basement or crawlspace, in a utility closet, or in a ground-level box near the street in warmer climates. It is usually a round wheel (a gate valve) or a straight lever (a ball valve). Find it, make sure you can reach it, and confirm it is not painted shut or buried behind storage.

Test that it actually works while the house is calm, not during an emergency. Turn it off, open a faucet on an upper floor to confirm the water stops, then turn it back on. A valve that will not budge or that keeps dripping after it is closed is something to flag now. The step-by-step technique for shutting off and exercising the main is covered in our guide on how to shut off the water to your whole house (131); this post is about locating and testing yours so you know it is there and it works.

Then map the smaller shutoffs. Most fixtures have their own stop valves: under each sink, behind each toilet, and on the supply lines feeding the washing machine and water heater. Open the cabinet under every sink and look. Knowing that a single toilet has its own valve means a running toilet at 2 a.m. is a quarter-turn problem, not a whole-house shutdown. For shutting off one fixture instead of the whole house, see our guide on how to shut off water to a single fixture (132).

Take Inventory: Pipe Material, Water Heater Age, and Fixture Condition

Write down what your system is actually made of, because the material and age of your pipes and heater drive almost every decision you will make later. You are building a baseline. Walk the basement, crawlspace, utility room, and under-sink cabinets with a flashlight and a notepad, and record three things: pipe material, water heater age, and the condition of visible fixtures and connections.

For pipes, identify what you can see where lines are exposed. Copper is reddish-brown and turns green where it corrodes. PEX is flexible plastic tubing, often red, blue, or white. PVC and CPVC are rigid white or cream plastic. Older homes may have gray galvanized steel or, in the oldest service lines, lead. One material matters for your health: the line that connects your home to the water main. According to the EPA, lead is a dull, soft, non-magnetic metal that scratches easily and turns a shiny silver color when scratched. You can do a quick check on an exposed section: scratch it with a coin or key, and if it turns bright silver, it may be lead or galvanized steel. Hold a magnet to it. The EPA notes a magnet will not stick to lead but will cling to galvanized iron. If you suspect a lead service line, the EPA is clear that a scratch test is only a clue and that testing your water is the only way to confirm lead is actually present. For the full process of identifying a lead service line, including contacting your water utility, see our guide on how to find out if you have a lead service line (154).

For the water heater, find its age. Most units have a rating plate near the top or side listing a serial number; many manufacturers encode the build date in that serial number, and a quick search of the brand and serial format will tell you the year. Why it matters: the U.S. Department of Energy reports that conventional storage tank water heaters typically last about 10 to 15 years. If your tag says the unit is already past a decade old, you are not in crisis, but you are on notice. Budget for it, watch for the warning signs, and do not get surprised. The decision of when to repair or replace one belongs to our guide on when to repair vs. replace a water heater (065).

For fixtures, just note condition. Look for green or white crust at pipe joints, slow rust stains under valves, a toilet that rocks, or a faucet that drips. You are not fixing these today. You are making the list that tells you what to watch.

One reference you will want as you record pipe types is how long each material is expected to last. Rather than repeat those numbers here, see our guide on how long do different plumbing pipes last (107).

Red Flags a Home Inspection May Have Missed

A general home inspection is broad and visual, so it often misses plumbing problems that only show up over time or behind finished surfaces. A standard inspection is not a plumbing inspection. The inspector runs faucets and flushes toilets, but does not camera the sewer line, does not test water quality, and rarely catches a slow leak inside a wall. In your first weeks, walk the house specifically hunting for the things that get past a quick once-over.

Look for the quiet signs of moisture. Brown rings on a ceiling, soft or bubbled paint near a tub or shower, a musty smell in a closet that shares a wall with a bathroom, or warped flooring around a toilet base can all point to a leak that an inspection-day walkthrough would not catch. Check under sinks for water-stained cabinet bottoms and for hard-water crust that signals a connection that weeps slowly.

Pay attention to drains and the sewer side too. If multiple drains are slow, or a lower-level fixture gurgles when an upstairs one runs, the issue may be in the main line rather than any single drain. In an older home, or one that sat vacant before you bought it, this is worth taking seriously, because a sewer or main-line problem is expensive and is firmly licensed-plumber territory, not a DIY fix. The same goes for any sign of past basement water near floor drains.

A practical move for any new owner is to run the EPA’s simple leak checks. According to the EPA WaterSense program, household leaks can waste more than 9,300 gallons of water a year, and many hide in plain sight. Put a few drops of food coloring in a toilet tank and wait about ten minutes without flushing; if color appears in the bowl, the flapper is leaking. Read your water meter, then avoid all water use for two hours and read it again; if the number moved, water is escaping somewhere. These two checks cost nothing and surface problems no inspection report listed.

Quick Wins That Prevent Expensive Surprises Early

A handful of low-effort, clearly safe tasks in your first weeks remove the most common causes of new-owner water damage. These are the do-them-now items. None require special skill, opening a pressurized line, or touching gas or the water heater’s internals.

• Swap the washing machine hoses for braided steel. A burst rubber washing-machine hose is one of the most common sources of sudden indoor flooding. If yours are old black rubber, replacing them with braided stainless lines is a straightforward, shutoff-and-swap job. The how-to lives in our guide on how to connect and maintain washing machine water hoses (166).
• Know where the floor drains and sump pump are, and test the sump. If you have a sump pit, pour a bucket of water in and confirm the pump kicks on and empties it. Testing it now beats discovering it failed during the first heavy storm.
• Check the water heater temperature setting. The Department of Energy recommends setting the thermostat to 120 degrees Fahrenheit, which reduces scald risk and slows mineral buildup; the Consumer Product Safety Commission recommends no higher than 120 degrees to prevent scalding. This is a dial or control-panel setting on the outside of the unit, not internal repair. If yours is cranked higher, turning it down is a safe adjustment.
• Find and label the breaker panel and the gas shutoff. You do not operate the gas shutoff casually, but knowing where it is matters in an emergency.
• Caulk gaps you can see around tubs and sinks. Fresh caulk where a tub meets the wall keeps water out of the structure and is a beginner-friendly task.

Resist the urge to tackle anything bigger in week one. If a task involves the water heater’s internals, the main line, a gas appliance, or any pipe you would have to cut, that is a different category of work. Note it and move on.

Setting Up Your Ongoing Plumbing Routine

Turn your inventory and your red-flag list into a repeating schedule, because a system you check on a calendar fails far less often than one you wait to break. This post got you oriented. The handoff happens here. The point of the first 90 days was to learn the house; the point of everything after is to keep it from surprising you.

Build a simple home file. Keep the make, model, and age of your water heater, the pipe materials you recorded, the location of every shutoff, and the date of anything you fixed or replaced. A phone note or a single sheet taped inside a utility-room cabinet is enough. When a plumber does eventually visit, this record saves time and money.

Then set recurring reminders rather than trusting memory. A few sensible intervals: test the sump pump and check exposed connections for moisture a couple of times a year, flush sediment from the water heater on the schedule its manual recommends, and do a seasonal pass before cold weather arrives. The detailed routine itself is not this post’s job. For the full recurring program, hand yourself off to our guide on a year-round home plumbing maintenance checklist (177), and for the deeper prevention habits that stop the most common problems, see our guide on how to prevent the most common plumbing problems (180).

One inventory item deserves a recurring reminder of its own: water pressure. Pressure that is too high quietly stresses every fixture, hose, and connection in the house. Under the International Plumbing Code, when static pressure exceeds 80 psi a pressure-reducing valve is required, though the exact figure and enforcement vary by jurisdiction, so confirm your local code. If a plumber or your own gauge ever flags high pressure, treat it as a real item, not a quirk.

When to Bring In a Plumber for a Baseline Assessment

Bring in a licensed plumber for a baseline assessment when your inventory turns up something you cannot safely evaluate yourself: a suspected lead service line, a water heater near or past its expected life, signs of a hidden or main-line leak, or a house old enough that you simply do not know what is behind the walls. A baseline visit early in ownership is not an admission of failure. It is the professional version of the inventory you just did, and it gives you a starting condition to measure against.

This is distinct from a formal, paid inspection product with a written report. That is its own thing, with its own scope and timing, covered in our guide on what plumbing inspections cover and when to get one (183). A baseline assessment is simpler: a pro confirms what you have, points out what is aging, and tells you what is urgent versus what can wait.

Draw the DIY line clearly and keep it. Locating shutoffs, swapping hoses, reading a data plate, running a dye test, and adjusting a thermostat dial are owner tasks. Anything involving gas lines, the water heater’s internal components, the main or sewer line, or work your local code requires a permit for is plumber territory, full stop. A new homeowner who knows that line, and who has spent a few weeks actually learning the house, is in a far stronger position than the previous owner ever wrote down.

Frequently Asked Questions

What is the very first plumbing thing I should do in a new house?
Find and test the main water shutoff valve. Confirm you can reach it and that it fully stops the water, so a future leak is a 30-second problem instead of a flooded floor.

How do I tell how old my water heater is?
Check the rating plate on the side or top of the tank for the serial number. Most manufacturers encode the build date in that serial, so a quick search of the brand and serial format reveals the year. The U.S. Department of Energy notes conventional tank water heaters typically last about 10 to 15 years.

How can I tell if my pipes are lead without hiring anyone?
On an exposed section, the EPA describes a scratch test: lead is soft and non-magnetic and turns shiny silver when scratched with a coin or key, and a magnet will not stick to it but will cling to galvanized steel. A scratch test is only a clue. Testing your water is the only way to confirm lead is present.

Is a regular home inspection the same as a plumbing inspection?
No. A general home inspection is broad and visual. It usually does not camera the sewer line, test water quality, or find slow leaks inside walls, which is why a separate plumbing baseline can be worth it in an older home.

What water heater temperature should a new homeowner set?
The Department of Energy recommends 120 degrees Fahrenheit, and the Consumer Product Safety Commission recommends no higher than that to prevent scalding. It also slows mineral buildup. This is an external dial setting, not an internal repair.

This article is general information, not professional advice. Plumbing conditions vary by home and by local code; for safety-critical or code-regulated work, consult a licensed plumber.

Sources

• U.S. EPA, Protect Your Tap: A Quick Check for Lead: https://www.epa.gov/ground-water-and-drinking-water/protect-your-tap-quick-check-lead
• U.S. EPA, EPA Researchers Share Approaches to Identify Lead Service Lines: https://www.epa.gov/sciencematters/epa-researchers-share-approaches-identify-lead-service-lines
• U.S. EPA WaterSense, Fix a Leak Week: https://www.epa.gov/watersense/fix-leak-week
• U.S. Department of Energy, Storage Water Heaters: https://www.energy.gov/energysaver/storage-water-heaters
• U.S. Department of Energy, Do-It-Yourself Savings Project: Lower Water Heating Temperature: https://www.energy.gov/energysaver/do-it-yourself-savings-project-lower-water-heating-temperature
• International Code Council, 2021 International Plumbing Code Section 604.8 (Water Pressure): https://codes.iccsafe.org/s/IPC2021P1/chapter-6-water-supply-and-distribution/IPC2021P1-Ch06-Sec604.8