# Sewer Pipe Material Identification Guide Clay is glossy orange brown with a joint every few feet. Cast iron is grey black with rust nodules. Orangeburg is matte tar colored and layered. Concrete is grey and coarse. PVC is smooth white or green. ABS is matte black plastic. Those six cover nearly every line under a Denver property. - Six materials cover almost every Denver line. - Camera confirms what era only suggests. - Material sets the repair menu. - Mixed material lines are common. - Identification comes before any quote. ## Identify Your Sewer Material Fast Look at wall texture, color, and joint spacing. Clay: glazed, orange brown, joint every two to three feet. Cast iron: dark grey, rough, rusted, magnetic where exposed. Orangeburg: matte black or brown, layered, often oval. Concrete: grey, coarse, larger diameter, usually commercial or storm. PVC: smooth, white or green, long runs with few joints. ABS: matte black plastic, smooth. Age narrows the field. Denver's oldest lines are usually clay or cast iron. Fiber pipe is in play for the postwar building boom. From the mid 1970s forward, PVC and ABS dominate. Many properties have more than one material because sections were replaced piecemeal over the years. That is why the camera runs the full length rather than stopping at the first clear view. - Vitrified clay: glazed ceramic, short sections, fails at joints rather than through the pipe wall. - Cast iron: metal, scale and rust, fails by channeling as corrosion works through the wall. - Orangeburg fiber: tar and wood fiber, deforms oval before it collapses. - Concrete: coarse grey, larger bore, corrodes with sulfides over time. - PVC: smooth plastic, solvent welded, failures are usually event driven rather than age driven. - ABS: matte black plastic, common 1970s and 1980s, failures are usually event driven rather than age driven. ## Why the Material Decides Everything Material determines which repairs are physically possible. A clay line with one bad joint is a spot repair. A fiber line with the same symptom is a replacement. Same symptom, completely different project. Material also determines safe cleaning. Aggressive cutting is routine in clay and cast iron and destructive in softened fiber. Finally, material sets expectations about remaining life. A 1985 PVC line with a root intrusion has decades left. A 1958 fiber line with the same intrusion does not. - Clay: sectional spot repair, CIPP lining, or replacement. - Cast iron: descaling, reaming, lining, or replacement. - Orangeburg: replacement by pipe bursting or open cut. - Concrete: jetting, lining on suitable diameters, or replacement. - PVC and ABS: spot repair at the damaged fitting or section. ## How We Identify a Line 1. **Access** We use an existing cleanout where possible, or create safe access before running the camera. 2. **Full Length Camera Run** We record the entire line rather than a sample, because material often changes partway. 3. **Locate and Depth** We mark the path and depth so material findings map to real positions on the property. 4. **Documented Findings** You receive footage plus a plain summary of material, condition, and next step by section. ## Cost Notes Identification is an inspection cost, not a construction cost. It is the smallest line item in any sewer project and the one that keeps the rest of the budget honest. Where no cleanout exists, access work adds a modest amount and usually pays for itself the next time the line needs service. ## Frequently asked questions **Can I tell the material from the age of my house?** Age narrows the options but does not confirm anything. Previous partial replacements are extremely common. **What material is used for replacements today?** New sewer lines in the Denver metro are generally PVC or HDPE, both of which are jointless or long jointed compared with older materials. **Can one line have several materials?** Yes, and it often does. We map where each section starts and ends. ## Applicable Methods and Related Diagnosis Pages - [How to Identify Orangeburg Pipe](https://www.denversewerandwater.com/materials/how-to-identify-orangeburg-pipe) The tells that separate fiber conduit from clay, cast iron, and PVC. - [Clay Tile Sewer Line Repair](https://www.denversewerandwater.com/materials/clay-tile-sewer-line-repair) Vitrified clay tile, its joint problem, and what repair options it accepts. - [Cast Iron Sewer Replacement](https://www.denversewerandwater.com/materials/cast-iron-sewer-replacement) Scale, corrosion, and channeling in cast iron, and when replacement wins. - [Sewer Line Lifespan by Material](https://www.denversewerandwater.com/materials/sewer-line-lifespan-by-material) Expected service life for every material buried under Denver properties. - [Sewer Camera Inspection](https://www.denversewerandwater.com/methods/sewer-camera-inspection) Video inspection that identifies the defect, its depth, and its location. - [Method Comparison and Cost Guide](https://www.denversewerandwater.com/methods/sewer-repair-method-comparison) Side by side comparison of every method, what drives cost, and what rules each out. --- Denver Sewer and Water is a privately owned, licensed and insured plumbing contractor. We are not affiliated with, endorsed by, or connected to Denver Water, the municipal water utility, or any government entity. To pay a municipal water bill or reach the public utility, visit denverwater.org. Source: https://www.denversewerandwater.com/materials/pipe-material-identification-guide