Ch. 17 Geothermal Energy Systems and Ambient Temperature Loops — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
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) Chapter 17 · Effective January 1, 2026 · Official source: Building Standards Commission
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
| Adopting Agency | BSC | BSC-CG | SFM | HCD 1 | HCD 2 | HCD 1-AC | DSA AC | DSA SS | DSA SS/CC | OSHPD 1 | OSHPD 1R | OSHPD 2 | OSHPD 3 | OSHPD 4 | OSHPD 5 | OSHPD 6 | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopt Entire Chapter | X | X | X | X | X | |||||||||||||||||||
| Adopt Entire Chapter as amended (amended sections listed below) | ||||||||||||||||||||||||
| Adopt only those sections that are listed below | ||||||||||||||||||||||||
| Chapter/ |
This state agency does not adopt sections identified with the following symbol: † The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
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Part I – General.
1701.0 General.¶
1702.0 Groundwater Systems.¶
1703.0 Design of Systems.¶
1704.0 Heat Pumps.¶
1705.0 Valves.¶
1706.0 Specific System Components Design.¶
1707.0 Installation Practices.¶
1708.0 System Start-Up.¶
1709.0 Decommissioning and Abandonment.¶
1710.0 General.¶
1711.0 Ground-Heat Exchanger Testing.¶
1712.0 General.¶
1713.0 Open Ground Water Systems.¶
1714.0 Testing and Verification.¶
1715.0 Direct Exchange (DX) Systems.¶
1716.0 Ambient Temperature Loop (ATL) Distributed Energy Systems.¶
Energy Systems.
1717.0 ATL Distributed Energy Systems Design Requirements.¶
Requirements.
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