Most plumbing problems in older homes trace back to a short list of causes: pipe materials near the end of their service life, drain and sewer lines that have cracked or filled with buildup, and water heaters or fittings installed decades ago. The right fix depends on what your house was built with. Start by identifying your pipes, then match each symptom to its likely cause before you decide between a repair and a replacement.
More homeowners deal with this every year. According to the National Association of Home Builders, the median age of an owner-occupied home in the U.S. reached 42 years in the 2024 American Community Survey. Hickory has its share of older housing too. The city has four National Register historic districts (Claremont High School, Kenworth, Oakwood, and Southwest Downtown), with roughly 530 properties on the National Register. Many homes in the Kenworth district date to the early 1920s and still have original or partly updated plumbing. This guide covers the problems that come up most often, what you can check on your own, and when it makes sense to call a plumber in Hickory, NC.
Identify Your Pipe Materials First
Older homes rarely have one pipe material from end to end. A house built in the 1920s might have galvanized steel supply lines, a cast iron drain stack, a clay sewer line running to the street, and sections of copper or PEX added during later remodels. Each material fails in its own way, so knowing what you have tells you which problems to watch for.
Start where the main water line enters the house, usually near the water meter, in a crawl space, basement, or garage. Then look under sinks, around the water heater, and along any exposed pipe in the crawl space. A few quick checks help:
• Magnet test: A strong magnet sticks to galvanized steel. It won’t stick to lead, copper, or plastic.
• Scratch test: If a dull gray pipe doesn’t attract a magnet, scratch it gently with a coin. Lead shows a shiny silver color underneath.
• Copper: Scraped copper looks like a new penny.
• Polybutylene: This is a flexible plastic pipe, usually gray indoors, often stamped “PB2110.”
| Material | Where You’ll Usually Find It | Typical Era | What to Watch For |
| Galvanized steel | Water supply lines | Common in homes built before about 1960 | Rusty water, dropping pressure, leaks at threaded joints, possible lead buildup if it was ever connected downstream of a lead line |
| Lead | Service line from the street; sometimes inside the home | Banned nationally for drinking water plumbing in 1986 | Lead in drinking water |
| Copper with lead solder | Water supply lines | Before the 1986 ban | Lead from solder joints; pinhole leaks in aging copper |
| Polybutylene | Supply lines and yard service lines | 1978 to 1995 | Sudden leaks at fittings or along the pipe |
| Cast iron | Drain stacks and main drain lines | Common in older homes | Scale buildup inside, cracks, rust-through along the bottom of horizontal runs |
| Clay (vitrified clay) | Sewer line from the house to the street | Common in older homes | Tree roots entering at joints, shifted or separated sections |
If you can’t see enough of the system to tell, check your home inspection report from when you bought the house. Your water provider may also have records on the service line that feeds your property.
Match the Symptom to the Likely Cause
Many older-home problems look alike at first. A slow sink and a failing sewer line can both start as “the water drains slowly.” This table helps you sort out where to look first.
| What You Notice | Likely Cause in an Older Home | Good First Step |
| Weak pressure at one faucet | Rust or sediment clogging the aerator | Unscrew and rinse the aerator |
| Weak pressure everywhere | Corroded galvanized pipe, a partly closed main valve, or a failing pressure regulator | Check the main shutoff and test pressure with a hose-bib gauge |
| Brown or orange water when a tap first opens | Corroding galvanized pipe or an aging water heater tank | Run cold and hot separately to see which side it’s on |
| Several drains slow at once, or gurgling toilets | Buildup or a blockage in the main drain or sewer line | Get a sewer camera inspection |
| Sewage smell or backups at the lowest drain | Cracked, root-filled, or collapsed sewer line | Stop heavy water use and have the line inspected |
| Water bill rising with no change in habits | Hidden leak or running toilet | Do the water meter test described below |
| Rumbling water heater or rusty hot water | Sediment buildup or a tank near the end of its life | Check the heater’s age from its label |
Low Water Pressure and Discolored Water
Galvanized steel pipe has a zinc coating meant to slow rust. Over decades, that coating wears away and the inside of the pipe corrodes. The rust builds up and narrows the opening a little at a time. That’s why many older homes have pressure that seems to get weaker every year, along with brown water when a faucet first turns on.
Narrow Down the Cause Before Replacing Pipe
Before assuming the whole system is failing, rule out the simpler fixes. If only one faucet is weak, take off the aerator at the tip and rinse it. Older pipes shed rust flakes that collect there. If pressure is low only on the hot side, the problem may be sediment in the water heater or a valve near it, not the supply pipes.
If the whole house is weak, make sure the main shutoff valve is fully open. Older gate valves can break inside and stay partly closed even when the handle turns. Some homes also have a pressure-reducing valve on the main line, and these wear out. A pressure gauge that threads onto an outdoor faucet costs a few dollars at a hardware store and gives you a reading in about a minute. North Carolina’s plumbing code is based on the International Plumbing Code, which calls for a pressure-reducing valve when incoming static pressure is above 80 psi, so very high readings are worth fixing too.
When Galvanized Pipe Needs to Go
Rust staining, repeated leaks at threaded joints, and low pressure throughout the house usually mean galvanized pipe is near the end of its useful life. Spot repairs often don’t last, because each new connection is threaded onto pipe that’s already corroded. Replacing the supply lines with copper or PEX (a flexible plastic tubing used in most new homes) solves the pressure problem and the rust problem at the same time.
There’s also a lead concern. Under EPA rules, a galvanized line that is or ever was downstream of a lead service line is classified as “galvanized requiring replacement,” because the galvanized pipe can absorb lead and release it into the water later.
Checking for Lead in Older Plumbing
Congress prohibited lead pipe and lead solder in drinking-water plumbing through the 1986 amendments to the Safe Drinking Water Act. A 2011 federal law tightened the definition of “lead-free” plumbing materials, and that stricter standard took effect in January 2014. If your home was built before 1986, lead could be present in the service line, in solder joints on copper pipe, in galvanized pipe, or in older brass faucets and valves.
North Carolina water systems have already done some of the groundwork. Under the EPA’s revised Lead and Copper Rule, every public water system had to submit an inventory of service line materials by October 16, 2024, covering both the utility-owned and customer-owned sides of the line. Newer federal rules require water systems to replace lead and “galvanized requiring replacement” lines under their control by November 1, 2037. In many systems, the homeowner is responsible for the service-line section on their property; confirm the division of responsibility with your water provider.
Here’s what to do if your home is older:
• Check the inventory. Ask your water provider how your service line is classified: lead, galvanized requiring replacement, non-lead, or unknown.
• Test your water. Use a state-certified lab. Your water provider can usually point you to one.
• Use cold water for drinking and cooking. Hot water pulls more lead from pipes and fittings. This includes water for baby formula.
• Run the tap after water has been sitting, such as first thing in the morning, until it turns noticeably colder.
• Coordinate replacement. If your service line is lead, talk with the utility before replacing your side. Replacing only one portion can disturb the rest of the line.
Polybutylene Pipe in Homes Built From 1978 to 1995
Not every older-home problem comes from very old homes. Polybutylene was a plastic pipe made from 1978 to mid-1995, and InterNACHI, a home inspector association, estimates it went into as many as 10 million U.S. homes. Over time, chlorine and other disinfectants in treated water react with the pipe and its fittings, making them brittle. Damage starts inside the pipe, so the outside can look fine until it splits.
The class-action settlement that once covered some repairs has ended, so replacement costs now fall on the homeowner. Because polybutylene often runs behind drywall and under floors, a leak can go unnoticed long enough to cause mold and water damage. If you’re waiting for a visible problem before acting, the damage may already be done by the time you see it.
If you find gray plastic pipe stamped “PB” or “PB2110,” plan on replacing it. A full repipe with PEX or copper is the usual solution. If only some sections are polybutylene, a plumber can trace where it runs and replace those runs.
Slow Drains, Gurgling, and Sewer Line Trouble
Older drain systems tend to fail in two places: the cast iron pipes inside the house and the clay sewer line outside.
Cast iron drains build up a rough layer of rust and scale inside. That layer catches grease and debris and narrows the pipe. Horizontal runs can also rust through along the bottom, where water sits. Clay sewer lines come in short sections, and each joint is a place where tree roots can work their way in looking for water. Roots grow inside the pipe, catch waste, and can crack or shift sections over time.
Warning signs include several drains running slowly at once, a toilet that gurgles when the tub drains, sewage odors in the yard or basement, water backing up into a floor drain or lower-level shower, or a strip of unusually green grass over the sewer line’s path.
A camera inspection is the best first step. A small waterproof camera on a cable goes down the line and shows exactly what’s going on, whether it’s a grease clog, roots at a joint, a belly (a sagging section that holds water), or a crack. That footage decides the fix:
• Snaking clears a single clog or cuts through light root growth.
• Hydro jetting uses high-pressure water to scour away scale, grease, and roots. In fragile old pipe, it should only follow a camera check.
• Spot repair replaces one damaged section.
• Trenchless lining forms a new pipe inside the old one, which can avoid digging up the whole yard if the old line still holds its shape.
• Full replacement makes sense when the line has collapsed or is damaged along much of its length.
Skip harsh chemical drain openers on old pipes. They rarely clear roots or heavy scale, and if they don’t work, they sit in the line until someone has to deal with them.
Hidden Leaks and Rising Water Bills
Older homes have more joints, older valves, and worn toilet parts, so small leaks are common. The EPA’s WaterSense program estimates that the average household’s leaks waste nearly 10,000 gallons of water a year, and that one in ten homes has leaks wasting 90 gallons or more per day. A faucet dripping once per second can waste more than 3,000 gallons a year. The EPA also says fixing easy household leaks can cut water bills by about 10 percent.
Two quick tests catch most hidden leaks:
- The meter test. Turn off every faucet and water-using appliance. Write down the reading on your water meter, wait two hours without using any water, and read it again. If the number changed, water is going somewhere.
- The toilet dye test. Put a few drops of food coloring in the toilet tank. If color shows up in the bowl within 10 minutes without flushing, the flapper is leaking.
If the meter moves but every toilet passes the dye test, the leak may be underground or inside a wall. That’s the point where professional leak detection saves time and limits damage.
Frozen Pipes in Crawl Spaces and Exterior Walls
Hickory’s winter temperatures regularly reach freezing, and hard freezes can push well below that. Older homes are more exposed because many have pipes in vented crawl spaces, exterior walls with little insulation, and outdoor faucets that aren’t frost-free.
Before winter:
• Wrap exposed crawl space pipes with foam pipe insulation.
• Disconnect garden hoses so water can drain from outdoor faucets.
• Close crawl space vents or install vent covers during cold months, if your crawl space design allows it.
• Consider replacing old outdoor faucets with frost-free sillcocks, which shut off the water inside the warm part of the wall.
• Find your main shutoff valve and make sure it turns.
During a hard freeze, let faucets on outside walls drip and open the cabinet doors under sinks so warm air reaches the pipes. If a pipe freezes, open the faucet it feeds and warm the pipe gently with a hair dryer, starting near the faucet. Never use an open flame. If you see a split or bulge, shut off the main water valve before it thaws.
Aging Water Heaters and Outdated Connections
The U.S. Department of Energy estimates that standard tank water heaters last about 10 to 15 years, while tankless units can last about 20. The age is usually printed on the label or coded into the serial number. Signs a tank is near the end include rust-colored hot water, rumbling or popping sounds from sediment, moisture or rust around the base, and hot water that runs out faster than it used to.
In older homes, the heater may have been replaced several times, sometimes without updating what’s around it. When you replace one, have the connections, venting, and temperature and pressure relief valve line checked against current code. Shutoff valves near the heater are also worth replacing if they’re old and stiff.
Repair, Replace, or Repipe: How to Decide
A single leak doesn’t always mean the whole system needs replacing. These guidelines help sort it out.
| Situation | A Repair Usually Makes Sense | Replacement or Repiping Usually Makes Sense |
|---|---|---|
| Leak frequency | One leak with a clear cause | Several leaks in a year, or new leaks after recent repairs |
| Pipe material | Copper or PEX in good condition | Galvanized steel or polybutylene |
| Water quality | Clear water, stable pressure | Rusty water and pressure dropping throughout the house |
| Lead | No lead found in testing or the utility inventory | Lead service line, or galvanized pipe classified as needing replacement |
| Sewer camera results | One clog or a small root intrusion | Cracked, collapsed, or badly offset sections along much of the line |
| Remodel plans | No walls or floors being opened | Kitchen or bath remodel planned, which makes access to pipes easier |
Cost, how long you plan to stay, and insurance requirements also play a role. If your insurer has flagged polybutylene or galvanized pipe, that may tip the decision toward replacement.
What to Ask Before Hiring Help for an Older Home
Older systems reward careful work. Before any major job, confirm that the person doing it is a licensed plumber. In North Carolina, you can look up a license through the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors.
When you compare plumbing services for an older home, these questions help:
• Will you do a camera inspection before recommending sewer or drain work, and can I see the footage?
• Does this job need a permit and inspection?
• What pipe material will you use, and why?
• Will you replace old shutoff valves while the water is off?
• Who handles drywall or floor patching after a repipe?
• Can I get the scope of work in writing?
Frequently Asked Questions
Can I keep my cast iron drain pipes?
Often, yes. Many cast iron drains still work well after decades, and a camera inspection will show whether yours have heavy scale, cracks, or rust-through that needs attention.
Does homeowners insurance cover old pipe failures?
It depends on your policy. Many policies treat sudden water damage differently from damage caused by long-term wear or slow leaks, so read your policy or call your agent to see how pipe age and material affect coverage.
How do I find out if my home has a lead service line?
Contact your water provider and ask how your line is classified in its service line inventory. If it’s listed as unknown, a water test from a certified lab and a visual check of the pipe where it enters your home are good next steps.
Should I repipe before selling an older home?
Not always. Buyers and their inspectors often flag polybutylene, galvanized, and lead pipe, though, so getting an estimate ahead of time helps you decide whether to replace the pipe, adjust your price, or disclose it with a plan in hand.
Get a Clear Picture of Your Older Home’s Plumbing
Whether you’re chasing a slow drain, rusty water, or a water bill that keeps climbing, the fix starts with knowing what’s behind your walls. A&B Plumbing is a family-owned plumbing company licensed in North Carolina and accredited by the BBB. We carry general liability and workers’ compensation insurance on every job. Call us to look at your pipes, water heater, or sewer line, and we’ll walk you through what we find and the options that fit your home.