Water Line Replacement – Mountain Park, Lake Oswego OR
True Flow Plumbing replaces water service lines throughout Mountain Park in Lake Oswego. Homes in Mountain Park were built in the 1970s with copper water service lines — now 50-plus years old and well into the age range where Portland's soft water chemistry has done significant interior damage. Soft water pitting in copper doesn't show on the outside; it develops microscopic pits on the interior walls that deepen over decades until a pinhole opens — often in a wall or underground where it isn't noticed until damage is already done. At this age, the right answer when problems appear is full replacement with PEX.
50-Year Copper vs. New PEX in Mountain Park
1970s Copper — 50 Years in Portland Soft Water
- Interior pitting from decades of acidic water
- Pinhole leaks — in walls, ceilings, or underground
- Blue-green staining at fixtures and drains
- Patching one pinhole leaves the rest unchanged
- Soil movement on hillside lots adds stress to joints
New PEX Service Line
- Immune to soft water pitting — no corrosion
- Flexible — handles hillside soil movement without joint stress
- No pinhole leak risk from water chemistry
- Full pressure restored from meter to house
- 50+ year rated service life
Signs Your Mountain Park Water Line Needs Replacement
- Small wet spots on walls or ceilings with no identifiable source
- Water bill increasing without explanation
- Blue-green staining at faucet aerators, drains, or fixtures
- Soft or wet area in the yard along the service line route
- Pressure lower at multiple fixtures than it used to be
- Home is 1970s Mountain Park construction with original copper
Hillside Lots and Installation Method
Mountain Park's hillside terrain on Waluga Hill means lot grades vary significantly across the neighborhood. Directional drilling — the boring machine method that replaces a water line without opening a trench — works well on many Mountain Park lots but isn't suitable for all of them. Steep grade changes, subsurface rock, or tight meter-to-foundation layouts can make targeted excavation the better approach on specific properties. We assess each lot individually before committing to a method and explain the reasoning before work starts. Either way, water is restored before we leave and most jobs are completed in a single day.
- Site assessment before committing to installation method
- Directional drilling where lot grade and soil allow
- New PEX service line — corrosion-proof, 50+ year rated
- City of Lake Oswego permit handled
- Water restored before we leave
- Most jobs completed same day
Frequently Asked Questions
I found a pinhole leak in my Mountain Park copper water line. Should I repair it or replace the whole line?
On 50-year-old copper in Portland's soft water, a pinhole isn't an isolated event — it means the interior pitting that produced it is present throughout the pipe. Patching that spot leaves the rest of the line in the same condition. Whether repair or replacement makes more sense depends on the overall line condition and how many pinholes have appeared. We'll assess what's there and give you an honest answer rather than defaulting to the larger job. On 1970s Mountain Park copper, full replacement usually makes more long-term sense than spot patches.
Do you serve all of Mountain Park?
Yes — all streets in Mountain Park on Waluga Hill in Lake Oswego. We also serve Palisades, Westlake, Lake Grove, First Addition, and the greater Lake Oswego area.
Mountain Park & Lake Oswego Neighborhoods We Serve
All Water Line Services – Lake Oswego → | Drain Cleaning – Mountain Park → | Sewer Scope →
Water Line Issues in Mountain Park?
Call us. We'll assess what's in the ground and give you straight answers on what it needs.