Our headquarters sits in Federal Way, which means our crews spend more time inside South King County homes than anywhere else in the state. After enough crawl spaces, you learn to predict a house's plumbing before opening the access hatch — because Federal Way was built in waves, and each wave installed the standard materials of its day. Some of those materials aged well. Two of them did not.
Pre-1970s homes: the galvanized problem
Homes built before the early 1970s — common near Redondo, Buenna, and the older blocks west of Pacific Highway — often still carry original galvanized steel supply lines. Galvanized pipe corrodes from the inside out: rust narrows the bore year by year, which shows up as weak flow at fixtures, rusty morning water, and pressure that drops when two fixtures run at once. The corrosion you can't see is the bigger issue — threaded joints rot until a minor bump or pressure spike opens a leak inside a wall.
If your home still has galvanized supply lines, repiping in copper or PEX is not a luxury upgrade; it's scheduled maintenance that's overdue. We repipe most Federal Way ramblers in two to three days, walls patched, with water back on every night.
1980s–90s homes: check for polybutylene
The Twin Lakes and West Campus expansions of the 1980s and early 90s coincided with the polybutylene era — a gray plastic pipe marketed as the future and later the subject of one of the largest class-action settlements in construction history. Poly fails without warning: chlorine in municipal water embrittles it from the inside, and the first symptom is often the ceiling coming down. Look for gray plastic pipe at the water heater connections or under sinks, often marked 'PB2110.' If you find it, have it assessed — insurers increasingly surcharge or decline homes that still have it.
Don't forget the pipe you can't see
Sewer laterals in older Federal Way neighborhoods are frequently original concrete or clay — prime targets for root intrusion from the mature evergreens this area is known for. If you own (or are buying) a pre-1980 home here, a camera inspection is cheap insurance against a five-figure sewer line replacement. Our sewer scope guide covers the warning signs in detail.
None of this is a reason to fear an older Federal Way home — they're well-built houses in a great part of the state. It's a reason to know what's behind the walls before it introduces itself. We're headquartered at 36058 21st Ln S, and South King County — Kent, Auburn, Des Moines — is our shortest drive. Request an assessment and we'll tell you plainly what your home's era means for its pipes.
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