Frequently Asked Plumbing Questions
Clear, concise, and safety-tested answers to the 20 most common questions American homeowners ask regarding plumbing emergencies, fixture maintenance, and professional contractor hiring.
How do I know if I have a hidden water leak?
Turn off every faucet and water-using appliance, then check your water meter. If the dial or low-flow indicator keeps moving over 15 to 30 minutes, you may have a leak. Other clues include an unexplained jump in your bill, musty odors, stains, or warped flooring. Toilets are a common culprit, so check them first.
What should I do first when a pipe bursts?
Shut off the main water valve, open the lowest faucet to drain the lines, and turn off your water heater (cut power at the breaker, or set a gas unit to pilot per its manual). Stay away from water near outlets or the electrical panel. Take photos for insurance, then call a licensed plumber.
Where is my main water shut-off valve?
It is usually where the water line enters your home: a basement, crawl space, utility room, or garage wall, or near the meter outside in warm climates. Find it before you need it, label it, and turn it once a year so it doesn't seize. Know whether it is a lever or a round wheel handle.
How often should I flush my water heater?
Many manufacturers recommend draining or flushing a tank heater about once a year to clear sediment, but instructions differ, so check your manual. Tank heaters often last roughly 8 to 12 years. If yours is older, noisy, or leaking, plan a replacement rather than waiting for a failure.
What temperature should my water heater be set to?
The U.S. Department of Energy suggests 120°F for most homes, which helps reduce scalding risk and energy use. Households with young children, older adults, or health conditions should weigh scald risk carefully, and anyone concerned about bacteria such as Legionella should talk with a plumber or health professional before changing the setting.
Is it safe to use chemical drain cleaners?
They can irritate skin and eyes, release harmful fumes, and may damage some pipes or fixtures. They are also risky if they sit in a standing clog before a plumber arrives. Try a plunger, a hand drain snake, or cleaning the P-trap first. Never mix cleaners. Recurring clogs usually need a professional.
Why is my toilet running constantly?
Most running toilets come from a worn flapper, a misadjusted float, or a faulty fill valve. Add a few drops of food coloring to the tank; if color shows up in the bowl without flushing, the flapper is leaking. These parts are inexpensive and often DIY-friendly. Left alone, a running toilet can waste a lot of water.
What causes low water pressure in a house?
First check whether it's one fixture or the whole house. One fixture often means a clogged aerator or showerhead. House-wide low pressure can point to a partly closed valve, a failing pressure regulator, corroded pipes, a hidden leak, or a supply issue. Home pressure is often cited in the 40 to 60 psi range, and codes commonly cap it near 80 psi.
How much does it cost to hire a plumber?
Prices vary widely by region, job complexity, parts, permits, and whether you call after hours. Rather than rely on a national average, ask for a written estimate that lists labor, materials, trip or diagnostic fees, and warranty terms. For non-emergencies, compare two or three licensed plumbers.
How do I choose a licensed plumber?
Verify the license with your state or local licensing authority, ask for proof of insurance, get a written estimate, and read recent reviews on several sites. Ask who pulls permits and what the warranty covers. Be cautious about pressure tactics, cash-only demands, or unusually low bids.
Do I need a permit for plumbing work?
Often yes for larger jobs such as water heater replacement, repiping, new gas lines, sewer work, or moving fixtures, but rules differ by city and county. Call your local building department to confirm. A licensed plumber typically handles permits and inspections, which can matter for insurance and resale.
When should I call an emergency plumber?
Call for sewage backup, a burst pipe or active flooding you can't stop at a shutoff, a heavily leaking water heater, or no water with signs of a major break. If you smell gas, leave the building first and call your gas utility or 911 from outside.
What should I do if I smell gas?
Don't flip switches, use lighters, or make calls inside. Leave immediately with everyone, including pets, and call your gas utility's emergency number or 911 from a safe distance. Don't go back until officials say it's safe. Only a licensed professional should repair gas lines or appliances.
How can I prevent frozen pipes?
Insulate exposed pipes in unheated spaces, keep your thermostat on, disconnect outdoor hoses, and open cabinet doors under sinks during hard freezes. Letting a faucet drip can help in extreme cold. Know where your main shutoff is. If a pipe freezes, thaw it gently and never use an open flame.
Should I choose a tank or tankless water heater?
Tank heaters store hot water and usually cost less upfront. Tankless heaters heat on demand and can last longer and save energy for some homes, but they cost more to install and may need larger gas lines, venting, or electrical upgrades. Flow-rate limits matter if several fixtures run at once.
Why does my drain smell?
Common causes include a dry P-trap in a rarely used drain, biofilm buildup, a clog, or a venting problem. Run water for a minute to refill the trap and clean the drain. If sewage odors persist or show up in several drains, call a plumber, because sewer gas shouldn't be ignored.
How long do household pipes last?
It depends on material, water chemistry, and installation. As rough rules of thumb, copper is often cited at 50+ years, galvanized steel around 40 to 60, and PEX around 40 to 50 or more. Older polybutylene and lead pipes are a concern. A plumbing inspection can tell you what you actually have.
What should never go down a toilet or drain?
Only toilet paper and human waste belong in the toilet. 'Flushable' wipes, paper towels, feminine products, and floss cause clogs. In sinks, avoid grease, oils, coffee grounds, and fibrous or starchy scraps, especially with a disposal. When in doubt, throw it out.
Can I replace a faucet or toilet parts myself?
Often yes. Replacing a flapper, fill valve, or faucet can be a good DIY project if your shutoff valves work and you have the right tools. Stop and call a pro if shutoffs are corroded or won't hold, pipes look damaged, or you're not comfortable.
Does homeowners insurance cover plumbing damage?
Many policies cover sudden, accidental water damage but not slow leaks, wear and tear, or the cost of repairing the failed pipe itself. Sewer backup often requires an optional endorsement. Policies differ, so read yours or ask your agent, and document damage right away.
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