Chapter 6 — WATER SUPPLY AND DISTRIBUTION
611.4 Sizing of Residential Softeners — 2025 California Plumbing Code
California Plumbing Code (Title 24, Part 5) · 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 Plumbing Code (Title 24, Part 5) § 611.4 · Effective January 1, 2026 · Official source: Building Standards Commission
Residential-use water softeners shall be sized in accordance with Table 611.4.
TABLE 611.4 SIZING OF RESIDENTIAL WATER SOFTENERS [4]
| REQUIRED SIZE OF SOFTENER CONNECTION (inches) |
NUMBER OF BATHROOM GROUPS SERVED1 |
|---|---|
3⁄4 |
up to 22 |
1 |
up to 43 |
For SI units: 1 inch = 25 mm
Notes: 1 Installation of a kitchen sink and dishwasher, laundry sink, and automatic clothes washer permitted without additional size increase. 2 An additional water closet and lavatory permitted. 3 Over four bathroom groups, the softener size shall be engineered for the specific installation. 4 See also Appendix A, Recommended Rules for Sizing the Water Supply System, and Appendix C, Alternate Plumbing Systems, for alternate methods of sizing water supply systems.
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