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A house built here in 1959 was plumbed to the standards of that decade, and in most cases that means cast iron drain lines below the slab and galvanized steel on the supply side. Both have finite lives. Cast iron corrodes from the inside out and loses wall thickness until it cracks or bellies; galvanized steel scales up internally, which shows first as falling pressure at the furthest fixture rather than as a leak.
Neither material was a mistake at the time. They are simply at the end of a service life that nobody expected to be measured against a 2026 water bill.
This is also the one Sugar Land neighborhood where the foundation type cannot be assumed. Texas residential construction was still moving toward slab-on-grade through this period, so some homes of this era sit on raised pier-and-beam foundations. That changes everything about how a drain line is reached — a pier-and-beam house is accessed from below, a slab house needs either a tunnel or a break-through in the floor.
The lakes matter too. Waterfront lots sit on a higher water table, which is a practical constraint on any under-slab work: an open tunnel fills differently here than on a dry lot three streets back.
Original below-slab drain lines that have corroded, bellied or cracked after six decades in Gulf Coast soil.
Internal scaling that shows up as weak pressure at the fixtures furthest from the meter, long before it leaks.
Homes from the transitional era that are reached from a crawl space rather than through the slab.
Under-slab repairs on lakefront lots, where groundwater changes how a tunnel is dug and shored.
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