Plumbing in Older Greenville Homes: Galvanized, Cast Iron and Clay

By the GVL Plumbers editorial team · Updated Oct 30, 2026 · 6 min read

Where the older homes are

What's probably in your walls, by era

How to tell what you have

Look where the main water line enters the house (often in the crawlspace or at the water heater) and under sinks.

• Galvanized steel: dull gray, threaded joints. A magnet sticks to it. Scratch it with a key and it shows silver-gray.
• Copper: reddish-brown or green with age, soldered joints. A magnet won't stick.
• Lead: dull gray, soft enough that a key scratch shows bright silver, often with a bulb-shaped joint. A magnet won't stick. Rare in Greenville supply lines, but possible in very old homes.
• Polybutylene: flexible gray plastic, often stamped "PB".
• Cast iron drains: heavy, black or rust-colored pipe, 3–4 inches across, with hub-shaped joints.

Lead: what Greenville Water says, and what's still in older houses

Greenville Water reports no lead service lines anywhere in its distribution system, based on its service line inventory, and its 2024 lead sampling came in at a 90th percentile of 0 ppb. It has run a corrosion-control program since the mid-1970s, adding an inhibitor because soft, low-alkalinity water can be aggressive toward metal pipe.

Inside the house is a different question. Copper pipe joined with lead solder before the 1986 federal ban, and older brass faucets and fittings, can still release small amounts of lead. If you have a pre-1986 home with young children or someone pregnant in it:

• Run the cold tap for a minute or two after water has sat overnight.
• Use cold water for drinking and cooking.
• Ask Greenville Water about testing, or use a certified lab.
• Replace old fixtures with ones labeled lead-free.

Galvanized pipe: repair or repipe?

Galvanized steel rusts from the inside, narrowing until a faucet barely runs, then leaks at the threads. One leak is fixable. When you see low pressure at several fixtures, brown water after the water sits, and repeat leaks, the pipe has reached the end of its life.

• Sectional replacement of the worst run (often the line feeding a bathroom) can buy time on a budget.
• A full repipe runs about $4,500–$15,000 on national guides. Crawlspace homes, common in 1950s–80s Greenville County construction, are at the lower end, because PEX can be run underneath with few wall openings.
• Mixed metals: where copper or brass meets galvanized steel without a dielectric fitting, the joint corrodes faster. These are the first places to check.

Our repiping guide covers the process, and the cost guide covers what moves the price.

Cast-iron drains and clay laterals

Cast iron rusts from the inside too, building scale that catches debris until drains slow throughout the house. Eventually it cracks, often along the bottom where it's hard to see. Clay laterals fail at the joints, where roots get in. Both are camera-inspection jobs; see our sewer line repair guide for the options and our who-owns guide for where your responsibility ends.

Greenville's mill villages

Greenville grew as a textile center, and its mill villages still hold some of the oldest plumbing in the county: Monaghan, Poe, Brandon, Judson, Dunean, Woodside, Mills Mill and Union Bleachery among them. Many mill houses were built with little or no indoor plumbing and had it added later, sometimes with sewer lines that ended up running under the houses themselves.

MetroConnects' Clean Water Forward program is rehabilitating about 100-year-old public sewer in several of these villages, funded partly by state SCIIP grants and federal money. Mills Mill came first, starting in 2024, with work that includes moving sewer lines from under houses out to the street. Union Bleachery's first phase was finished in May 2025, Dunean followed, and Judson was next in line.

What it means for a homeowner: the program fixes the public system. When a line is moved to the street, your house needs a working connection to the new main, so watch for notices from MetroConnects about your street, and ask what part of the reconnection it covers before hiring anyone.

Buying or renovating an older house

• Add a sewer camera inspection to the home inspection.
• Ask what the supply pipe is and test the pressure at the top floor's shower while a downstairs tap runs.
• Check for polybutylene in 1978–95 homes; some insurers ask about it.
• Plan pipe work during the remodel, while walls and floors are already open.
• Historic districts: exterior changes can need design review in the City of Greenville; interior plumbing usually needs only the normal permit. Ask the city if you're unsure.

What to fix first

1. Anything leaking now, and gas or venting problems.
2. The sewer lateral, if it has backed up more than once.
3. Galvanized supply, if pressure or leaks are getting worse.
4. The water heater, if it's past about 10–12 years.
5. Fixtures and shutoff valves: old gate valves often won't close when you need them.

Older home plumbing questions