Plumbing in Original Tolleson Homes Built Before 1970: A Room-by-Room Guide

Original Tolleson, the historic residential core south of Van Buren Street that dates to the city's 1912 founding, contains some of the oldest housing stock in the West Valley. Homes built in the 1920s through the 1960s carry plumbing systems that predate modern pipe materials, current water code, and in many cases any significant maintenance or inspection in the decades since original installation. If you own one of these homes or are considering purchasing one, here is what the plumbing system likely contains and where to focus a professional assessment.

Supply Lines: Galvanized Steel and Early Copper

The supply lines most commonly found in pre-1970 Original Tolleson homes are galvanized steel, with some 1950s and 1960s homes transitioning to copper. Galvanized steel has a functional service life of 40 to 70 years under normal conditions, which means the oldest galvanized installations in Original Tolleson are at or well past end of service life.

Signs that galvanized supply lines are failing: water pressure has declined noticeably at showers and upstairs fixtures over the years; water from cold-water taps has a rusty or slightly metallic tint when first opened after a period without use; there have been multiple small leaks at fittings or fixture connections within a short period. In homes with mixed-material supply (copper hot lines, galvanized cold lines, a common mid-century configuration in Original Tolleson), the galvanized cold-water lines are typically the first to show severely restricted flow.

Drain Lines: Cast Iron and Early Plastics

Original Tolleson homes built in the 1920s through the 1950s most commonly have cast-iron drain stacks with hub-and-spigot joints sealed with lead and oakum. Cast iron has a long potential service life but deteriorates on the interior from decades of scale accumulation and corrosion, and the lead-and-oakum joint connections can crack or pull apart with foundation movement. Common signs of aging cast-iron drain issues include persistent slow drains throughout the house that do not fully clear with snaking, and visible rust-colored staining around floor drain connections or at clean-out access points.

Homes built in the 1950s and 1960s may have transitioned to early ABS plastic drain sections, which have their own deterioration characteristics: brittleness from decades of thermal cycling, and joint failures at hub connections where the original adhesive bond has dried out over decades.

Sewer Lateral: The Most Overlooked Component

The buried sewer lateral connecting the home to the city sewer main is the most commonly overlooked plumbing component in older homes, primarily because it is out of sight until it fails. In Original Tolleson homes, the lateral may be clay tile, cast iron, or early Orangeburg pipe (a fiber-based material used in some mid-century installations that has a particularly short service life).

A sewer camera inspection of the lateral is the single most important plumbing assessment for a pre-1970 Original Tolleson home. The camera identifies root intrusion through clay tile joints, interior deterioration in cast iron, and any bellied or offset sections where standing water creates recurring blockages. Many buyers and owners of these homes discover that the lateral is the most significant repair need, and understanding its condition before other plumbing work is planned allows for better prioritization and budget allocation.

Water Heater

Water heaters in pre-1970 Original Tolleson homes are sometimes installed in non-standard locations: exterior alcoves, detached garage utility areas, or converted storage spaces that experience extreme temperature swings in Arizona summers. Units in these locations age faster than units in conditioned utility rooms. In Tolleson's hard-water environment at 16 to 19 grains per gallon, a water heater more than eight years old is approaching or past the expected service life for local conditions. If the unit is original to the home or has not been replaced in more than eight years, a replacement evaluation is worth scheduling before an emergency failure creates water damage in the utility space.

Gas Lines

Pre-1970 Original Tolleson homes served by natural gas typically have original steel gas pipe now 50 to 80 years old. Flexible appliance connectors at ranges, water heaters, and furnaces have a recommended replacement interval of approximately 20 years. Original connectors in these homes are well past that interval. If the home has not had the gas system pressure-tested and the appliance connectors inspected in recent years, this is a maintenance item worth including in any professional plumbing assessment.

Where to Start

For owners of pre-1970 Original Tolleson homes who have not had the plumbing system professionally assessed, the most useful starting point is a sewer camera inspection combined with a licensed plumber's walk-through of the visible supply and drain system. The camera inspection provides the clearest picture of the most potentially costly repair. The walk-through identifies visible galvanized supply issues, drain condition, and water heater status. Together, these two assessments give a prioritized picture of what the system actually needs without requiring any destructive access.