1703.2 Piping and Tubing Materials Standards — 2025 California Mechanical Code

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · California

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Italicized text is a California amendment to the model code, as printed in the official publication.

Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1703.2 · Effective January 1, 2026 · Official source: Building Standards Commission

For water-based systems, ground source heat pump ground-loop pipe and tubing shall comply with the standards listed in Table 1703.2. Piping and tubing used for DX systems shall be of copper in accordance with Section 1715.3. TABLE 1703.2

PLASTIC GROUND SOURCE LOOP PIPING

MATERIAL	STANDARD
Cross-linked Polyethylene (PEX)	ASTM F876, CSA B137.5, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-3
High Density Polyethylene (HDPE)	ASTM D2737, ASTM D3035, ASTM F714, AWWA C901, CSA B137.1, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-1
Polypropylene (PP)	ASTM F2389, CSA B137.11, NSF/ANSI 358-2
Polyethylene of Raised Tempera- ture (PE-RT)	ASTM F2623, ASTM F2769, CSA B137.18, ANSI/CSA/IGSHPA C448, NSF/ANSI 358-4

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▸Contents — California Mechanical Code (Title 24, Part 4)

California Mechanical Code (Title 24, Part 4)

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