Finding water leaks in Arcadia

Arcadia is the clearest example in the Valley of a neighbourhood whose leaks come from its history rather than from its plumbing. The citrus ground it was laid out on came with flood irrigation, and a good deal of that system is still in use on private lots today.

That is the single most useful thing to understand about water here, so it is worth saying plainly: Salt River Project’s responsibility ends at its delivery gate. Once a zanjero opens that gate, the water travels to your property through ditches, channels and pipelines that are owned, operated and maintained by the homeowners themselves — who are also responsible for keeping all of that water on their own property.

The City of Phoenix describes the Camelback East Village, which contains Arcadia, as enriched with long-standing established neighbourhoods with flood irrigated lots, in areas which once were occupied by citrus groves, and notes that a major portion of the village’s housing was built between 1950 and 1970. The Census figures for 85018 line up with that.

Source: U.S. Census Bureau, American Community Survey 5-year estimates (2023). Geography: ZIP Code Tabulation Area 85018.

Past the SRP gate, the pipe is yours

Which means the gates, valves, standpipes and buried laterals on an Arcadia lot are private pipe. When one of them is losing water it is not a call to the utility, and nobody is coming to dig up the street. It is exactly the sort of call we get: water that arrives on schedule, goes somewhere it should not, and leaves a low corner permanently soft.

Flood irrigation makes detection harder in a specific way. The ground is periodically meant to be wet, so wet ground proves nothing, and the usual visual clue is gone. What still works is pressure behaviour, line tracing and listening between deliveries, when the system should be holding and quiet. That is when a leaking lateral gives itself away.

Related: irrigation and flood-irrigation leaks and underground and buried line work.

A slab from the era when copper bends were the weak point

Two thirds of the housing in the ZIP code that covers Arcadia predates 1980, and the median year of construction is 1971. Under a slab of that age the supply is usually copper, and copper of this era tends to fail where it was bent or where it rubs against a rebar chair — so the leak is rarely underneath the damp flooring you are standing on.

Arcadia also has a lot of mid-century houses with beautiful, unforgiving finishes: terrazzo, original tile, wide expanses of polished concrete. Nobody wants a speculative trench across that, which is why we would rather spend the time isolating and listening than open anything on a hunch.

The soil does not help

It is not uncommon to find clay, caliche or other hardpan layers at relatively shallow depths across greater Phoenix, and caliche restricts the movement of water so that it perches on top rather than draining away. On an Arcadia lot that means water can travel sideways along a hard layer and surface a long way from the pipe that lost it.

Related: slab leak detection and slab leak repair and rerouting.

Which Arcadia are we talking about?

Worth asking early, because the name straddles a city line. Some of what people call Arcadia is in Phoenix, some is in Scottsdale, and the name gets used for addresses out towards Paradise Valley too. It makes no difference to how we work, but it does decide who bills your water, and that matters as soon as a bill is part of the story.

Around half the homes here are owner-occupied and barely half the housing is single-family, which is higher-density than the tree-lined picture suggests. On a shared lot or a small cluster, the first job is often simply working out which unit the water is leaving from.