When is it time to swap out old pipes?

White crust is usually just mineral buildup, nothing to lose sleep over unless it gets out of hand.

Yeah, that’s what I’ve been told too. My place is about 30 years old and there’s definitely some crusty spots, but nothing wild. The green stuff freaked me out at first, but turns out it was just one section near a leaky joint. Haven’t noticed any weird smells or taste in the water yet, thankfully. I guess as long as the water pressure’s good and there’s no leaks, I’ll just keep an eye on things.

The green stuff freaked me out at first, but turns out it was just one section near a leaky joint.

That green corrosion is usually copper oxide - shows up when there’s a little moisture hanging around. Not the end of the world, but definitely worth keeping an eye on. Here’s how I usually break down the “should I swap pipes?” question:

- Age isn’t everything: 30 years isn’t ancient for copper or even galvanized steel, but it’s kind of like dog years for polybutylene or old PVC. If you’ve got those, start budgeting for replacement.
- Pressure drops: If water pressure starts to tank in certain spots, that can mean buildup inside the pipes or even pinhole leaks. Sometimes you don’t notice until you try to run two showers at once and suddenly it’s a sad trickle.
- Discoloration: Brown or yellow water after the tap hasn’t been used? Could be rust inside steel pipes. Not always urgent, but it’s a sign things are breaking down.
- Leaks and stains: One leaky joint isn’t a crisis, but if you start seeing water stains on ceilings or walls - or worse, actual drips - it’s time to get serious.
- Taste and smell: You said you haven’t noticed any weird smells or tastes, which is good. Metallic taste or rotten egg smell is a red flag.

Funny story - had a client swear their pipes were fine “because they’re still shiny under the sink.” Turned out the main line in the crawlspace looked like Swiss cheese. Sometimes what you see isn’t the whole picture.

If you’re comfortable with it, check exposed pipe sections in your basement or crawlspace every so often. Tap them with a screwdriver; if they sound dull or flake apart, that’s not great news.

Bottom line: if it ain’t leaking and your water’s clear, probably no rush. But keep an eye on those crusty spots and maybe take some photos every few months for comparison. Pipes rarely fail all at once - they just get sneakier as they age...

I’m right there with you on not panicking about a little green corrosion, but I’ve learned the hard way that ignoring it for too long can bite you. A couple years back, I waited until a pinhole leak turned into a mess behind the drywall - definitely not worth the “wait and see” approach if you’re seeing more than one spot. My rule now:

- If I see more than one crusty joint, I call a plumber for an inspection.
- If pressure drops or water gets funky, I budget for at least partial replacement.
- For old polybutylene or brittle PVC, I just plan to swap it when I’ve got the cash.

Trying to avoid those surprise plumbing bills… they always show up at the worst time.

That’s a solid approach, and I can relate - waiting too long on plumbing issues has burned me more than once. The “wait and see” method only works until you’re staring at a soaked ceiling or a tenant’s frantic text at 2am. I’ve found that if you’re seeing green corrosion in multiple spots, it’s usually the tip of the iceberg. Even if things seem fine now, it’s just a matter of time before something gives.

You’re dead on about polybutylene and old PVC. Those materials are just ticking time bombs, especially in older buildings. I used to think I could stretch them a few more years, but after one too many emergency calls (and drywall repairs), I just started budgeting for replacements as soon as I took over a property. It hurts up front, but it’s way cheaper than dealing with water damage later.

One thing I’d add - sometimes plumbers will try to upsell you on whole-house repipes when you might get away with targeted fixes for a while longer, especially if you’re not seeing pressure drops or leaks yet. But if you’ve got tenants or anyone relying on the place, peace of mind is worth a lot.

Anyway, your checklist makes sense to me. Staying proactive saves money and headaches down the line. Plumbing surprises always seem to hit right after you’ve paid for something else... Murphy’s Law at work.

I get where you’re coming from, but I’m not totally sold on the “replace everything ASAP” approach unless there’s a real pattern of issues. I’ve had some copper pipes with green spots that hung in there for years with no drama - just needed a little TLC and regular checks. Sometimes it feels like the plumbing industry pushes full replacements a bit too hard, especially if you’re handy and can keep an eye out for early warning signs. Not saying ignore problems, but sometimes targeted repairs really do buy you more time than folks think.

Sometimes it feels like the plumbing industry pushes full replacements a bit too hard, especially if you’re handy and can keep an eye out for early warning signs.

Yeah, I hear you. Not every green spot means the sky’s falling. I’ve seen pipes that looked rough but kept chugging along for ages. Full replacement is pricey - sometimes it’s just overkill unless you’re seeing leaks or serious corrosion. A little maintenance goes a long way, honestly.

Not every green spot means the sky’s falling.

Exactly. I’ve seen folks panic over a little discoloration, but honestly, some pipes just look ugly and still do their job fine. As long as you’re not seeing pinhole leaks or major rust flakes, you’re probably good for a while. Just keep an eye out and don’t let anyone scare you into a full swap unless it’s really needed.

Had the same debate with myself last fall - noticed a weird greenish patch under the kitchen sink and freaked out a bit. Here’s what I did: wiped it down, checked for moisture, and then put some paper towel underneath to see if any water dripped overnight. Nothing happened, so I just kept checking every week. It’s easy to get spooked when you’re new to this stuff, but monitoring and not jumping straight to replacing everything saved me a lot of money... and stress.

I get wanting to avoid unnecessary work, but greenish patches under the sink usually mean corrosion, especially if you’ve got copper pipes. I had something similar and ignored it for a while - turned out there was a slow leak inside the wall. Ended up with a bigger repair job than if I’d just swapped out the bad section early on. Sometimes it’s worth being proactive, even if it feels like overkill at first.

Yeah, those greenish spots are usually a dead giveaway for copper corrosion. I’ve seen folks try to just wipe it off and hope for the best, but that’s like putting a band-aid on a busted pipe. Thing is, sometimes you can get away with just replacing a small section, but if the corrosion’s widespread or you’re seeing pinhole leaks, it might be time to bite the bullet and swap out a bigger chunk.

Curious - has anyone here actually tried one of those epoxy pipe liners as a fix? I’ve heard mixed things. Some say it buys you time, others say it’s just delaying the inevitable. Wondering if it’s worth considering before going full replacement, especially in older houses where tearing into walls is a nightmare.

“I’ve heard mixed things. Some say it buys you time, others say it’s just delaying the inevitable.”

- Looked into those epoxy liners when I spotted green patches in my basement.
- Price tag wasn’t terrible compared to ripping out walls, but I kept hearing stories about them failing after a few years.
- If you’re planning to stay put long-term, I’d lean toward actual pipe replacement. Feels safer, even if it stings the wallet.
- That said, if you’re just trying to buy a couple years before a big reno, might be worth a shot. Just don’t expect miracles...

- Totally get where you’re coming from on the liners. I’ve seen a couple jobs where they looked fine at first, but then a year or two later, there were weird leaks or the liner started peeling away. Not always, but enough that it makes me nervous about recommending them for anything long-term.

- One thing I noticed - if your pipes are already super corroded or have a bunch of pinhole leaks, the liner doesn’t really fix the underlying problem. It’s more like putting a band-aid on something that probably needs stitches.

- Pipe replacement is definitely pricier and messier, but at least you know what you’re dealing with. Plus, if you’re already seeing green patches (assuming that’s copper corrosion), it might be a sign things are further along than they look.

- If you’re just trying to hold out until a bigger reno, yeah, maybe the liner buys you some time. But I wouldn’t trust it for peace of mind over the long haul... especially if you hate surprises like sudden water damage at 2am.

I’ve been weighing this exact thing for a while, especially since I’m not looking to gut the whole house just yet. The liner vs. replacement debate always gets me thinking about cost vs. risk. Here’s how I’ve been breaking it down for myself:

1. Figure out how much of the piping is actually bad. If it’s just a section or two, maybe a liner makes sense as a stopgap. But if you’re seeing corrosion or leaks in multiple spots, that feels like a sign the whole system’s on borrowed time.

2. Think about how long you want to stay in the house. If you’re planning to move in a couple years, maybe patching is fine. But if you’re settling in for the long haul, replacement seems like the safer bet.

3. Consider what’s behind your walls and floors. In my place, the pipes run under original hardwood I’d rather not rip up unless I have to. That’s made me more cautious about jumping straight to replacement.

4. Budget-wise, lining can seem cheaper upfront, but if it fails and you end up replacing anyway, you’re basically paying twice. That’s the part that bugs me.

I’ve heard some folks say that water pressure drops are a big red flag too - like if you’re noticing weaker flow at faucets, it could mean the pipes are closing up inside with corrosion or buildup. Has anyone here actually had that happen before going for a full replacement? Did you regret waiting?

I’m also curious: has anyone tried partial replacement - like just doing the worst sections - and did that buy you any real peace of mind? Or did it just delay the inevitable? Just trying to figure out if there’s a middle ground that makes sense without blowing up the whole budget...

Budget-wise, lining can seem cheaper upfront, but if it fails and you end up replacing anyway, you’re basically paying twice. That’s the part that bugs me.

You’re spot on about the “paying twice” risk - seen that play out more than once in older buildings. I’ve done partial replacements in a few units and honestly, it bought some time but never really felt like a long-term fix. The peace of mind only lasted until the next section started leaking. Water pressure drops are definitely a red flag too; if you’re already noticing that, chances are the rest of the pipes aren’t far behind. Still, your breakdown is solid - especially factoring in how destructive full replacement can get with original features. Sometimes there’s just no perfect answer...

Honestly, I’ve been down this road a few times and it’s never as straightforward as you hope. Here’s what’s worked (or not) for me:

- Lining *can* be a quick fix, but if your pipes are already corroded or have a bunch of pinhole leaks, it’s like putting a band-aid on something that needs stitches. I had a section lined in my last place - looked good for about two years, then the next joint failed and I was back to square one.
- Full replacement is brutal if you’ve got original tile or plaster you care about. The mess is real. But once it’s done, you stop worrying every time you hear the pipes creak or see a water spot on the ceiling.
- Water pressure dropping? That’s usually the canary in the coal mine. In my experience, by the time you notice it, there’s probably a lot more going on inside those pipes than you want to know about.
- Partial replacement is tempting cost-wise, but it rarely solves things long-term. I did half my kitchen and ended up chasing leaks into the walls six months later. At that point, wish I’d just bitten the bullet.

If you’re on the fence, sometimes it helps to get a plumber to do a camera inspection - at least then you know exactly what shape things are in. Not cheap, but better than guessing.

One thing I will say: if you’re living in an old house with irreplaceable features, sometimes it’s worth getting creative with routing new pipes through closets or soffits instead of tearing up original floors/walls. Not always possible, but saved me some headaches (and cash) when I did it.

No perfect answer here...but if leaks and pressure drops are starting up, waiting usually just means bigger repairs down the line.

“Partial replacement is tempting cost-wise, but it rarely solves things long-term.”

Couldn’t agree more. I tried patching just the worst spots in my 1950s place, thinking I’d save money, but it turned into a game of whack-a-mole. If you’re seeing rust flakes in the aerators or brown water after vacations, that’s another red flag. One thing I’d add: if you do go for full replacement, map out your shutoff valves first - saved me a ton of hassle when I had to isolate sections during the work.

Totally get where you’re coming from. I’ve seen folks spend more on patch jobs over a few years than if they’d just bitten the bullet and done the whole thing. One thing I’d add - don’t forget to check what type of pipe you’ve got behind the walls. Sometimes you find a mix of copper, galvanized, even old lead in the same run... makes planning a bit of a headache. And yeah, mapping shutoffs is clutch, but also label everything while you’re at it. Saved me a ton of confusion later on.

Yeah, labeling is a lifesaver - learned that the hard way after chasing a mystery valve for half a day. I hear you on the mixed piping too. Last place I worked on had copper spliced into old galvanized, and every fix felt like a gamble. Sometimes I wonder if it’s worth just budgeting for a full repipe upfront, even if it stings at first. Patch jobs can nickel-and-dime you over time... but then again, not everyone’s got the cash to go all in at once. It’s always a bit of a balancing act.

Mixed piping is basically plumbing roulette - never know what’s gonna leak next. I’ve seen patch jobs turn into a full-blown scavenger hunt, especially when you add in decades-old repairs. Sometimes biting the bullet on a repipe saves you from chasing leaks every other month, but yeah, that upfront cost can be brutal. Still, if you’re fixing the same spot twice, that’s usually my red flag.

Ever run into a spot where you fix a leak, and then a few months later, it’s the pipe right next to it? That’s usually when I start wondering if it’s worth patching anymore. But sometimes, I’ve seen folks get years out of a good repair, even with mixed materials. Curious - do you guys think water pressure issues play into how soon old pipes give out, or is it mostly just age and material?