Is PEX Legal in California? What Tustin Homeowners Should Know About Code Approval, Standards and Inspections
PEX was not always allowed in California homes. How it became part of the state plumbing code, which standards and markings to look for, and what a Tustin inspector…
Homeowners in Old Town Tustin, Tustin Meadows and Peppertree sometimes hear that PEX is not allowed in California, usually from a relative or a neighbor who remembers the debate years ago. It is a fair question to ask before you replace every pipe in your house, so here is the short version: yes, PEX is approved for potable water in California homes, and it is installed under permit every day across Orange County.
A little history
For many years, California was one of the last states that did not list PEX in its plumbing code for general use, while the rest of the country had used it for a long time. The holdup was a long environmental review and legal process about whether plastic water pipe could affect water quality. That process ended around 2009 and 2010, when PEX was added to the California Plumbing Code for statewide use. Since then it has become one of the most common materials for new construction and repiping.
What makes a PEX install code compliant
The code does not just say PEX is fine. It sets requirements for the pipe, the fittings and the installation:
- Pipe printed with its standards, such as ASTM F876 and F877, plus NSF/ANSI 61 for drinking water contact. Look for the markings along the side of the tubing.
- Fittings listed for the system, such as ASTM F1960 cold-expansion fittings for PEX-A.
- Support spacing, protection where pipe passes through studs, and nail plates where it is close to the face of a wall.
- Separation from heat sources like water heater flues and recessed lights, with metal or approved transitions at the water heater.
- A pressure test before walls are closed.
What the Tustin inspector looks at
Repiping in Tustin requires a plumbing permit through the city's Community Development Department. A typical sequence is a rough inspection with walls and ceilings open, where the inspector checks the pipe markings, supports, fittings and pressure test, followed by a final after patching. Homes in Tustin Ranch, built mostly in the 1980s and 1990s, and the older ranch homes west of the 5 freeway both follow the same path. Condos and townhomes may also need HOA approval for access through shared walls.
Why PEX-A is our usual choice
For most Tustin repipes we use PEX-A with expansion fittings. The pipe is flexible enough to snake through attics and walls with fewer openings, the fittings have a full-bore inside diameter, and the material tolerates the occasional freeze far better than copper or CPVC. Copper is still an option if you prefer it, and we will price both so you can compare.
Related reading
See how a full PEX repipe is planned and compare materials in PEX vs copper. Nearby residents can visit Irvine, Costa Mesa and Lake Forest, or see all cities at repipeinc.com.
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Repipe OC, 23821 Hillhurst Drive, Laguna Niguel, CA 92677, (949) 524-2362, CSLB #1087885 C-36.
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Written by Repipe OC · CSLB #1087885 C-36 · 23821 Hillhurst Drive, Laguna Niguel, CA 92677 · (949) 524-2362