Master-planned community · Scottsdale
Finding a water leak in McCormick Ranch
Houses began going up here in the early 1970s around man-made lakes and miles of linked greenbelt, which makes the common-area water system as old as the community and far longer than any pipe in a house.
McCormick Ranch is a master-planned community in Scottsdale, with homes built from the early 1970s onward around man-made lakes and greenbelts, which means half-century-old copper under the older slabs and a common-area irrigation system of the same generation.
McCormick Ranch was among the first communities in the Valley to be planned whole rather than subdivided piecemeal, with its owners’ association incorporated in September 1972 and houses going up from the early 1970s. That makes its infrastructure some of the oldest purpose-built community infrastructure we work on.
The thing that sets it apart is not the houses, though they matter. It is the sheer length of shared, watered ground: acres of man-made lakes, miles of linked greenbelt and a landscaped parkway running through the community, plus two eighteen-hole golf courses. That is a continuous buried irrigation system rather than a series of separate ones, and it has been in the ground for half a century.
What pipe is under a McCormick Ranch home?
Copper, on the homes from the community’s first decade, which is most of them. Streets filled in later carry newer material, but copper is the assumption to start from here.
Copper of the early 1970s has been in the slab for around fifty years. It fails at a single worn point, almost always where the tube was bent at installation or where it rests against something set into the concrete. The escape is small and the water goes wherever the backfill lets it, so the damp patch indoors is evidence that a leak exists and almost no evidence of where.
The reliable shortcut on this generation is temperature. The hot line usually fails first, and a hot line escaping under concrete warms the slab above it, which a thermal camera can read through tile, timber or carpet before anything is cut.
Related: slab leak detection and thermal imaging leak detection.
| What we go on | In McCormick Ranch |
|---|---|
| Build window | from the early 1970s; no completion year verified |
| City or jurisdiction | Scottsdale, Arizona |
| Likely supply material | copper supply under the older slabs, with later material on the streets filled in afterwards |
| What tends to fail first | copper at bends and rub points, and old glued joints on greenbelt mains |
| What we check first | a thermal sweep indoors, and a continuous-versus-scheduled reading on anything outdoors |
Is McCormick Ranch older than the rest of Scottsdale?
Yes, by close to twenty years at the community’s start, which puts it among the oldest housing in a city that is not itself young.
Scottsdale’s own Census profile shows a city with genuine age in it, and McCormick Ranch at the early end. The American Community Survey puts the median year of construction at 1990, with nearly three in ten homes built before 1980.
| Housing across Scottsdale city, Arizona | Share |
|---|---|
| Median year built | 1990 |
| Built before 1980 | 29 percent |
| Built since 2000 | 26 percent |
Source: U.S. Census Bureau, American Community Survey 5-year estimates (2023). Geography: Census place.
Why does a leak here so often surface somewhere else?
Because the community is threaded with continuous greenbelt and linked landscape, so water that escapes under one property has a long, soft, well-drained path to travel before it reaches a surface. It emerges where the ground lets it, not where it left the pipe.
The way out is to stop treating the wet spot as the starting point. Establish first whether a loss is continuous or scheduled: a break upstream of the station valves passes water every hour of the day, while one downstream of a valve only passes it during that station’s cycle. That single distinction tells you whether you are looking at a mainline or one zone, and it is read from a meter rather than from the grass.
Related: irrigation and drip leak detection, community and HOA leak detection and what a board gets in writing.
Asked and answered
What do people in McCormick Ranch ask us?
What kind of pipe is under a McCormick Ranch home?
Copper, on most of them. Houses began going up in the early 1970s, which places the majority of the community firmly in the copper era, with newer material only on streets filled in later. Copper of that age wears through at bends and rub points rather than bursting, and the hot side tends to go before the cold.
The wet ground is on the greenbelt, not on my lot. What now?
It is still worth establishing the facts, because water in linked greenbelt travels a long way before it surfaces, and the visible symptom is often some distance from the failure. The first thing to settle is whether the loss runs continuously or only during an irrigation cycle, which distinguishes a mainline break from a single zone.
Is McCormick Ranch older than the rest of Scottsdale?
Yes, by close to twenty years at its start. The Census Bureau puts Scottsdale's median year of construction at 1990 while this community began building in the early 1970s. Scottsdale does contain a lot of older housing, so the community is at the early end of a wide range rather than a lone outlier.
Wet ground or a warm floor in McCormick Ranch?
Tell us where it is and whether it changes with the irrigation schedule, and we will say what it points to.
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What customers in the Phoenix valley have written. The words are theirs, on listings we cannot edit.
“Humberto has been amazing! Prompt, professional, and patient. He has gone above and beyond, taking the time to show me how to operate the water valves and educating me so I can continue to monitor for future leaks. He identified multiple leaks and made thoughtful recommendations.”
“Beto was very professional, thorough and patient in explaining everything he was doing and why. It was an excellent and well worth it experience, and this is saying something for an architect who had a hundred questions!”
“The owner and operator of this company is everything a contractor should be. On time, honest, competent, reachable, comprehensive. Hope to work with him again in the future.”