Last reviewed and updated: 2026-09-20
The neighbourhoods around Marietta Square include the city's oldest housing, much of it on crawlspace or pier foundations with plumbing that has been repaired, extended and partially replaced many times over a century. Galvanised steel and cast iron are still in service here. Homes in this area are also usually billed by Marietta Power & Water rather than Cobb County, which means a completely different leak credit process.
What makes the Square area different
- Development era: the oldest in the city, late 19th and early 20th century through to mid-century
- Foundations: crawlspace and pier predominate, with some later slab infill
- Likely pipe: galvanised steel, cast iron drains, early copper, and layers of later patch repairs
- Water utility: usually Marietta Power & Water, not Cobb County
- Historic status: parts fall within designated historic districts, which affects what work is permitted
- Access: crawlspaces make much of the plumbing reachable, which helps
A century of plumbing layers
Plumbing in a home this old is rarely one system. It is galvanised steel from one era, copper from a 1970s partial repipe, PEX from a 2000s bathroom remodel, and cast iron drains underneath all of it. Each junction between materials is a potential failure point, and dielectric corrosion where dissimilar metals meet is a genuine issue in houses like these.
Galvanised steel is the specific thing to watch. It corrodes internally, narrowing the bore until pressure drops noticeably, and then it perforates. Locating it is standard leak detection in Marietta work, priced as a flat diagnostic: see what it costs.
The leak profile here
The most common calls here are pressure complaints that turn out to be corroded galvanised supply, cast iron drain failures under crawlspaces, and leaks at the junctions where one generation of pipe meets another. The compensation is access: a crawlspace means much of the system can be inspected directly rather than through a slab. Where later infill sits on concrete, it is slab leak detection work like anywhere else in Marietta.
| Most common leak type | Why, in this area |
|---|---|
| Galvanised steel corrosion | Internal rust narrows the bore, then perforates: original supply pipe in many homes |
| Cast iron drain failure | Century-old drain lines cracking and separating at joints |
| Dissimilar metal junctions | Dielectric corrosion where copper meets galvanised from a partial repipe |
| Crawlspace supply leaks | Exposed pipe, freeze damage and physical damage |
| Sewer lateral failure | Old clay laterals under mature street trees |
| Hidden leaks from added bathrooms | Later remodels running new pipe through old structure |
Which water utility bills you here
This is the key local difference. Homes around the Square are usually inside the City of Marietta utility service area, which means the bill comes from Marietta Power & Water, not Cobb County Water System. The two run entirely separate leak credit processes. Applying to the wrong one is a common and avoidable mistake: check the utility name printed on your bill first.
Historic districts and what they affect
The area takes in the Square itself and the surrounding streets including the Whitlock Avenue and Kennesaw Avenue historic corridors and the Church Street and Cherokee Street neighbourhoods. Parts fall within designated historic districts, which can affect exterior work, excavation and anything visible from the street. It is worth establishing early whether a proposed repair route runs into that, because it changes which repair options are realistic.
Frequently asked questions
Am I billed by the city or the county near Marietta Square?
Usually by Marietta Power & Water, because the Square area sits inside the City of Marietta utility service area. That matters because the city and Cobb County run entirely separate leak credit processes. Check the utility name printed on your bill.
What pipe is in a house near the Square?
Frequently several kinds. Original galvanised steel supply, cast iron drains, copper from a 1970s partial repipe and PEX from a later bathroom remodel can all be present in the same house. Each junction between materials is a potential failure point.
Why is my water pressure low in an older Marietta home?
Very often corroded galvanised steel supply pipe. It rusts from the inside, progressively narrowing the bore until pressure drops noticeably, and perforation usually follows. A pressure gauge reading plus the age of the pipe usually confirms it.
Does historic district status affect leak repairs?
It can, particularly for exterior work, excavation and anything visible from the street. It is worth establishing early whether a proposed repair route runs into those requirements, because it changes which repair options are realistic.
Is a crawlspace better or worse than a slab for finding leaks?
Generally better. A crawlspace lets much of the supply and drain system be inspected directly, rather than having to be located through concrete. The trade-off is that crawlspace pipe is exposed to freezing and physical damage.