4.304 Outdoor Water Use — 2025 California Green Building Standards Code

California Green Building Standards Code (Title 24, Part 11) · 2025 edition · updated 2026-09-25 · California

CBSC: official editions, supplements and errata

Cite as: 2025 California Green Building Standards Code (Title 24, Part 11) § 4.304 · Effective January 1, 2026 · Official source: Building Standards Commission

4.304.1 Outdoor potable water use in landscape areas. Residential developments shall comply with a local water efficient landscape ordinance or the current California Department of Water Resources’ Model Water Efficient Landscape Ordinance (MWELO), whichever is more stringent.

RESIDENTIAL MANDATORY MEASURES

Notes:

The Model Water Efficient Landscape Ordinance (MWELO) is located in the California Code of Regulations, Title 23, Chapter 2.7, Division 2.

MWELO and supporting documents, including a water budget calculator, are available at: https://www.water.ca.gov/

Get a plain-English answer with a citation back to this text.

Ask AI about this code

Export this section

▸Contents — California Green Building Standards Code (Title 24, Part 11)

California Green Building Standards Code (Title 24, Part 11)

GoCodebook provides public access, search, citation, multilingual explanation, and practical interpretation of legally adopted building regulations. It is not a substitute for the official ICC or California code publications.