Galvanized water lines — internal scale, restricted flow, possible lead.
Zinc-coated steel supply pipe, threaded and magnetic. The interior corrodes over decades, building scale that throttles fixture flow and may entrap lead-solder remnants. Limited Eden Prairie cohort — original Round Lake cottages, pre-1955 Pioneer Trail farmhouses, scattered Flying Cloud builds — but every one we find gets a flow test and a recommendation.
Slow throttle. Quiet lead pathway. Easy to miss without a flow test.
Eden Prairie's pre-1960 housing fringe is small but real. Original Round Lake cottages, pre-1955 Pioneer Trail farmhouses, a handful of Flying Cloud-corridor structures. On those properties, galvanized supply persists either as the entire system or as a partial-replacement holdover — galvanized stubs to fixtures with copper main, or copper at the water heater feeding galvanized risers behind walls. The corrosion scale narrows the effective inside diameter from 3/4-inch nominal to 3/8-inch effective, throttling flow at second-floor fixtures and the most-distant outdoor hose bib. We measure it. We document it. We recommend a lead test before anyone drinks the water.
How galvanized goes bad.
Six conditions we audit every time galvanized turns up in an Eden Prairie home.
Internal scale buildup
The signature failure mode. Iron-oxide tubercles narrow the bore. Visible at any fitting that can be opened — the inside of a tee or elbow tells the story.
Galvanic dissimilar-metal joint
Galvanized to copper without a dielectric union. Galvanic corrosion accelerates at the joint. Common at water-heater connections.
Lead solder at copper transitions
Pre-1986 plumbing solder contained lead. Where galvanized meets copper, the joint may have been soldered with lead-bearing alloy. Test the water.
External rust drip stain
Visible weep stain below a fitting indicates pinhole start or thread seep. Even small leaks accelerate scale; the failure curve is non-linear.
Partial replacement
Half-house galvanized, half-house copper or PEX. Documented common in Eden Prairie's pre-1960 stock. Remaining galvanized still throttles flow.
Galvanized service line
Buried galvanized from curb stop to home. Replacement is a street-side excavation. Documented and itemized as separate scope from indoor re-pipe.
Three steps. Magnet, gauge, photograph.
Visual + magnet at every accessible run
Galvanized is grey-silver and magnetic. We confirm with a magnet at the meter, water heater, fixture stub-outs, and any accessible behind-wall section. Each location is photographed.
Pressure at the most-distant fixture
Static and dynamic pressure measured at the highest, most-distant fixture and compared to supply main pressure. Restriction is quantified — not just observed.
Re-pipe scope & lead-test recommendation
Same-evening report includes magnet-confirmed locations, pressure-test results, photos of any rust drip, and a re-pipe scope recommendation paired with a lead-water-test recommendation.
Pre-1960 Eden Prairie home? Book a precision inspection.
Two-minute quote. Booking this week. Pressure-tested results same evening.