By Austin Holcomb & Austin Webb, Pineapple Plumbing | Summerville, SC
Every plumbing call starts the same way: something isn’t working the way it should, and the homeowner isn’t sure how serious it is. A slow drain might be a minor clog or the first sign of root intrusion in a 60-year-old sewer lateral. A water bill spike might be a running toilet or a hidden supply-line leak behind a wall. The problem you see on the surface rarely tells the whole story.
After 22 combined years of working on plumbing systems across Charleston, Summerville, Mount Pleasant, and the Lowcountry, we’ve learned that most plumbing problems fall into a handful of categories. The difference between a minor fix and an expensive repair usually comes down to how quickly the homeowner recognizes what’s happening and whether they wait it out or call early.
This guide covers the most common plumbing problems we see in Charleston-area homes, what’s likely causing each one, how urgent it is, and what you should do about it.
Quick Reference: What’s Happening and How Urgent Is It?
Use this table to get a quick read on your situation before diving into the details below.
| What you’re noticing | Likely problem | Urgency | What to do first |
|---|---|---|---|
| One slow drain | Localized clog (hair, grease, debris) | Schedule soon | Try plunging; if it returns, call a plumber |
| Multiple slow drains at once | Main line blockage or venting issue | Call today | Stop using water; call for diagnosis |
| Toilet overflowing | Clog in the trap or branch line | Call today | Shut off toilet valve; stop flushing |
| Water stain spreading on ceiling or wall | Active leak above or behind the surface | Call today | Take photos; locate nearest shut-off |
| Sudden drop in water pressure (whole house) | Broken supply line or failed valve | Call today | Check main shut-off; call immediately |
| No hot water | Water heater element, pilot, or thermostat failure | Schedule soon | Check breaker (electric) or pilot (gas) |
| Water heater actively leaking | Tank failure or fitting leak | Emergency | Turn off gas/power and cold water supply |
| Unexplained water bill increase | Hidden leak somewhere in the system | Schedule soon | Run the water meter test (see below) |
| Sewage smell from drains | Dried P-trap, venting issue, or sewer problem | Schedule soon | Run water in all drains; if smell persists, call |
| Water pooling at base of toilet | Failed wax ring or cracked base | Call today | Shut off toilet valve; don’t continue using |
| Banging or hammering pipes | Water hammer from pressure spikes | Monitor | If persistent, schedule a pressure check |
| Rusty or discolored water | Corroded pipes or failing water heater | Schedule soon | Test hot and cold separately to isolate source |
Why Do Drains Keep Clogging in Charleston Homes?
A single slow drain is usually a straightforward fix. Hair and soap residue build up in bathroom drains. Grease coats kitchen drain walls over time. These are normal wear problems that a plunger or professional clearing resolves quickly.
But when the same drain clogs again within a few weeks, or when multiple drains slow down around the same time, the problem is deeper. In Charleston, the two most common causes of recurring drain problems are tree root intrusion and deteriorating pipe material.
Charleston’s live oaks and mature landscaping send roots toward moisture in aging sewer laterals. Clay and cast iron lines, common in homes built before the 1970s across downtown Charleston, West Ashley, and James Island, are especially vulnerable because roots enter through joint gaps and cracks. Once inside, they catch everything that flows past until the line blocks completely.
What you can check: If only one fixture is slow, try plunging it. If that clears it temporarily but the clog returns, or if multiple drains are affected, call for a professional drain evaluation. A camera inspection shows exactly what’s inside the line.
What happens if you wait: Recurring clogs that aren’t addressed eventually become full blockages. A full blockage in the main line can cause sewage to back up into your home through floor drains, tubs, and toilets.
What Causes Low Water Pressure Throughout the House?
If water pressure drops at every fixture in your home, the problem is in the supply system, not at individual faucets.
In Charleston homes built before the 1960s, the most common cause is galvanized steel supply lines that have corroded from the inside out. The interior of the pipe narrows over decades until water barely flows through. Cleaning aerators and adjusting the pressure regulator helps temporarily, but the underlying problem is the pipe itself.
Other causes include a failing pressure regulator (the bell-shaped device near where the main supply enters the house), a partially closed main shut-off valve, or a break in the underground supply line between the meter and the house.
If pressure is low at only one fixture, the problem is usually a clogged aerator, a partially closed valve under the sink, or a supply line that has kinked or corroded at the connection point.
What you can check: Unscrew the aerator from the affected faucet and rinse out any sediment. If that doesn’t help, check whether the shut-off valve under the fixture is fully open. If the whole house is affected, check that the main shut-off valve is fully open.
When to call: If pressure continues to decline across the house after checking the obvious causes, a plumbing evaluation can identify whether the issue is pipe corrosion, the regulator, or the supply line.
How Can I Tell If I Have a Hidden Leak?
Hidden leaks waste water, inflate your bills, and cause damage you can’t see. The EPA estimates that 10 percent of American homes have leaks wasting 90 or more gallons every day.
The fastest way to check is the water meter test: turn off every fixture, appliance, and ice maker in the house. Go to your water meter and write down the reading. Wait two hours without using any water. If the reading changed, water left your system somewhere.
Other signs include water stains on walls or ceilings that grow or change shape, unexplained bill increases over two or three billing cycles, dampness or musty smell under sinks or in the crawl space, and warm spots on the floor (which can indicate a hot water line leak beneath a slab).
In Charleston’s humid climate, hidden leaks are especially problematic because damp materials behind walls and in crawl spaces don’t dry on their own. Mold can begin developing within 48 to 72 hours of sustained moisture.
When to call: If the meter test confirms a leak you can’t find, professional leak detection uses acoustic equipment, thermal imaging, and pressure testing to locate the source without tearing into walls until the exact location is confirmed.
Why Is My Toilet Running (and How Much Water Is It Wasting)?
A running toilet is one of the most common and most underestimated plumbing problems. The sound is easy to tune out, but a worn flapper valve can waste 200 gallons per day without making much noise at all.
The fix is usually simple: the flapper (the rubber seal at the bottom of the tank) has deteriorated and no longer creates a tight seal. Water leaks from the tank into the bowl continuously. A replacement flapper costs a few dollars and takes five minutes to install.
Less commonly, the fill valve or float mechanism may be malfunctioning, causing the tank to overfill and drain through the overflow tube. This also wastes water continuously.
How to test: Remove the tank lid and add a few drops of food coloring to the tank water. Wait 10 to 15 minutes without flushing. If the color appears in the bowl, the flapper is leaking.
When to call: If replacing the flapper doesn’t stop the running, or if the toilet rocks on its base, leaks at the floor, or has cracks in the porcelain, a professional assessment is the next step.
What’s Wrong With My Water Heater?
Water heater problems are among the most common calls we take, and the symptoms usually fall into a few patterns.
No hot water at all. On electric units, a tripped breaker or failed heating element is the most likely cause. On gas units, a pilot light that won’t stay lit or a faulty thermocouple is typical. Both are usually repairable.
Hot water runs out too quickly. Sediment buildup at the bottom of the tank reduces usable volume and insulates the water from the heat source. Annual flushing prevents this. If it’s been years since the tank was flushed, the sediment layer may be significant.
Popping or rumbling sounds. Hardened sediment getting disturbed during heating cycles. This means the unit is working harder than it needs to.
Leaking at the base. This can be condensation (common and harmless during humid Charleston summers) or an actual tank failure. If the tank itself has corroded through, replacement is the only option.
Rusty hot water only. The anode rod (a sacrificial metal rod designed to corrode instead of the tank) has worn out. Replacing it early can extend tank life by years. If corrosion has reached the tank walls, replacement is necessary.
When to call: If your water heater is over 8 years old, showing any of these symptoms, or you can’t remember the last time it was flushed, schedule a water heater evaluation.
Why Do My Pipes Make Banging or Hammering Noises?
Water hammer is a pressure shock caused when water flow is suddenly stopped, usually when a faucet, valve, or washing machine solenoid closes quickly. The momentum of the water creates a shockwave that rattles the pipes.
Occasional water hammer is common and usually harmless. Persistent, loud water hammer can indicate water pressure above 80 psi, loose pipe supports, or a failed air chamber or water hammer arrestor.
What you can check: If the noise is new, check your water pressure with a gauge ($10 at any hardware store). Healthy residential pressure is 40 to 60 psi. Above 80 psi requires attention because it stresses pipes, fixtures, and water heaters over time.
What Does a Sewage Smell in the House Mean?
If you smell rotten eggs or sewage inside your home, the first thing to check is your P-traps. Every drain has a curved pipe section that holds a small amount of water, creating a seal that blocks sewer gas from entering the home. When a drain sits unused for weeks (guest bathrooms, floor drains, laundry tubs), that water evaporates and the seal breaks.
In Charleston’s heat, P-traps dry out faster than in cooler climates. Running water in all unused drains for 30 seconds refills the traps and usually eliminates the odor immediately.
If the smell persists after refilling all traps, the issue may be a cracked or failed vent pipe, a venting problem in the drain-waste-vent system, or a damaged sewer lateral. These require professional diagnosis.
Why Charleston Homes Are Harder on Plumbing
These problems occur everywhere, but several factors make them more frequent and more damaging in the Lowcountry.
Humidity keeps damp materials wet. A hidden leak behind a wall in a drier climate might partially dry between moisture cycles. In Charleston, where humidity stays above 70 percent for months, wet drywall, wood framing, and insulation stay wet. Mold develops faster. Corrosion accelerates. Damage compounds.
Older pipe materials are reaching end of life. Galvanized steel supply lines in pre-1960s homes, cast iron drains in pre-1970s homes, and polybutylene in 1978 to 1995 construction are all materials that fail with age. Charleston’s housing stock spans every one of these eras.
Flat terrain means slower drainage. The Lowcountry sits at minimal elevation with shallow slopes on sewer lines. Waste moves slower and settles more easily than in hillier markets, making grease buildup and sediment accumulation more common in kitchen and main drain lines.
Heavy storm season stresses drainage. Hurricane-season rainfall can overwhelm drain systems, especially in older downtown neighborhoods with combined sewer and stormwater connections that back up during major events.
Salt air corrodes outdoor plumbing faster. Homes near the coast in Mount Pleasant, James Island, Folly Beach, and Sullivan’s Island see outdoor fixtures fail in roughly half the normal lifespan due to salt-laden humidity.
Frequently Asked Questions
How much does a plumber charge for common repairs in Charleston?
Most common repairs (faucet leaks, running toilets, single-fixture clogs, minor pipe repairs) cost $150 to $500 in the Charleston area, depending on the issue and parts needed. Water heater replacement ranges from $1,200 to $2,500 for tank units and $2,500 to $4,500+ for tankless. We provide a written estimate before starting any work.
How do I know if my plumbing problem is an emergency?
Active water flowing where it shouldn’t (burst pipe, water heater rupture, overflowing fixture), sewage backing up into your home, no water throughout the house, or the smell of gas near a plumbing appliance are all emergencies. Shut off the water (or gas, and leave the house if you smell gas) and call immediately. A slow drain, a dripping faucet, or low pressure at one fixture can typically wait for a scheduled appointment. Learn more about our emergency service.
Can I use chemical drain cleaners to clear a clog?
We don’t recommend them. Chemical drain cleaners generate heat that can damage older pipes, sit in low spots eating at the pipe wall, and rarely remove the full blockage. For kitchen clogs, try plunging first. For recurring clogs, professional clearing with a camera inspection identifies and resolves the actual cause.
How can I tell if my pipes are old enough to need replacing?
Look at exposed pipes in your crawl space, garage, or under sinks. Galvanized steel (silver-gray metal, threaded fittings) in pre-1960s homes is likely past its useful life. Polybutylene (gray flexible plastic) in 1978 to 1995 homes has a documented failure history. Cast iron (heavy, dark metal) drains older than 50 to 60 years develop internal corrosion. A plumbing inspection identifies materials and remaining useful life.
Why does my water look rusty or discolored?
If only the hot water is discolored, the water heater’s interior or anode rod is likely deteriorating. If both hot and cold are affected, supply pipes are corroding internally, most commonly in homes with galvanized steel lines. Persistent discolored water from multiple fixtures means the corrosion is advanced enough to warrant professional evaluation.
How often should I have my plumbing professionally inspected?
Once a year for most Charleston homes. Homes over 30 years old, properties with mature trees near sewer lines, and coastal properties with accelerated corrosion benefit from more frequent checks. An annual maintenance inspection covers supply lines, shut-off valves, the water heater, drains, and the crawl space.
Does Charleston’s water quality affect my plumbing?
Charleston Water System delivers water at approximately 3.5 grains per gallon (moderately soft). This causes less mineral buildup than hard-water areas, but sediment still accumulates in water heaters and can affect fixture aerators over time. Annual water heater flushing and periodic aerator cleaning address this.
What should I do before the plumber arrives?
If there’s an active leak, shut off the water at the fixture valve or the main supply. Move belongings away from standing water. Take photos of any damage before cleanup (useful for insurance). When you call, let us know what you’re seeing, whether you’ve been able to shut off the water, and what type of home you’re in (slab, crawl space, historic, newer construction). That helps us arrive prepared.
When Something Doesn’t Feel Right, Call Early
Most of the expensive plumbing repairs we see started as small problems someone hoped would go away on its own. A drip that ran for months behind a wall. A slow drain that finally backed up. A water heater that rumbled for a year before it failed.
The earlier you call, the simpler and less expensive the fix. If anything in this guide sounds like what’s happening in your home, give Pineapple Plumbing a call at (843) 739-7438 or schedule service online. We’ll tell you what we find, explain your options, and let you decide. No pressure, no surprises.
Pineapple Plumbing. 503 N Commodore Way, Summerville, SC 29483.
