Why 1970s-90s Copper Pipes Are Failing Across Marietta
The single biggest plumbing issue in our service area comes down to one fact: a lot of houses are the same age as their original pipes.
If you ask us what the single most common serious plumbing problem is across our Marietta-area coverage, the answer isn't really a specific symptom. It's an age range. Most of East Cobb, Indian Hills, and a good portion of Historic Marietta and Kennesaw were built out between the 1970s and late 1990s, and the copper supply lines installed during that construction boom are now 30 to 50 years old. That's not a coincidence showing up in a handful of houses. It's a structural fact about the housing stock itself.
Copper doesn't last forever, even when it's installed correctly
Copper pipe has a genuinely long service life, often cited in the range of decades, but it isn't indefinite. Water chemistry, water hardness, and the specific conditions inside a given home's system all affect how quickly internal corrosion progresses. Cobb County's moderately hard water accelerates the process somewhat, contributing to the pinhole leaks and slab leaks that become common once a system crosses that 30-year mark. None of this means the original installation was done poorly. It means copper, like anything else, has a lifespan, and a large share of our area's homes are now approaching or past it at roughly the same time.
One leak is normal. A pattern is the actual signal
A single pinhole leak
Age-appropriate wear on an otherwise sound system. Usually a straightforward repair.
A second leak within a year or two
The point where the math often shifts toward a full repipe instead of continued spot repairs.
Slab leaks specifically
A hot water line leaking under the foundation, common in slab-on-grade construction from this era.
Discolored water or visible green/blue staining
A sign copper corrosion has been developing for a while, not a new event.
When repair stops being the cheaper option
The hardest part of this for most homeowners isn't understanding that their pipes are old. It's knowing when to stop repairing individual leaks and start thinking about the system as a whole. As a rough guide, a single leak in a home in this age range is usually just a repair. A second leak within a year or two is typically the point where a full repipe starts to cost less over the next several years than continuing to chase leaks one at a time, especially once you factor in the water damage that often comes with each new leak.
PEX has become the more common choice for a full repipe in homes like this, largely because it doesn't develop the same pinhole-leak pattern that aging copper does. Copper remains an option for homeowners who prioritize its longevity and are willing to pay more upfront. Either way, any repiping work is performed to the Georgia State Minimum Standard Plumbing Code, based on the International Plumbing Code (IPC), and the decision itself is easier to make with real information about your specific system's condition and leak history than with a general rule of thumb.
You don't have to wait for a leak to find out where you stand
If your home falls into this construction era and you haven't had any leak history yet, that's genuinely good news, not a guarantee of future safety, but a sign your system may still have useful life left. A leak detection assessment can give you a clearer picture of your system's actual condition rather than just its age on paper.
Why your neighbor's repipe might not predict your own timeline
It's a natural instinct to look at a neighbor's recent repipe and wonder if your own home, built the same year on the same street, is on the same clock. In practice, individual water usage, whether a home has had any prior partial repiping, and even small variations in original installation quality all affect the actual timeline. Two houses built in the same subdivision in 1985 can genuinely be years apart in terms of how much life is left in their copper. That's exactly why we look at your specific system's condition and leak history rather than assuming your home's timeline matches a neighbor's.
Repiping is a real investment, but so is repeated repair
We understand that a full repipe is a significant expense, and it's reasonable to want to avoid it as long as possible. The point of this article isn't to push every homeowner in this age range toward an immediate repipe. It's to help you recognize the pattern, a second leak caught through leak detection within a year or two of the first, that actually signals the math has shifted, a pattern we see often in Indian Hills' oldest homes.
What to ask before you close
If you're house hunting in Marietta and considering a home built in this era, it's worth asking directly whether the plumbing has been repiped, and if so, when and with what material. A home with a documented repipe is generally a safer bet than one with original 1970s-90s copper and no leak history on record, since the absence of a known leak doesn't tell you much about how close the system actually is to its first one. A pre-purchase plumbing inspection, similar in spirit to a sewer camera inspection for the drain side, can give you a much clearer picture than relying on the home's age alone.
Not sure where your system stands?
We'll give you an honest read on your home's specific situation.