Davis, CA Building Safety: Plumbing Permits (2026)
Key Facts
- Adopted code
- 2025 California Plumbing Code
- New-home fitting
- 3/4-inch irrigation T-fitting required
- Exception
- Waived where irrigation well water is supplied
- Indirect waste
- Pot/scullery sinks need indirect connection
- Penalty
- Misdemeanor: up to $1,000 fine, 6 months jail
Summary
Davis adopts the 2025 California Plumbing Code with a signature local amendment: every new single-family home or duplex needs a 3/4-inch "T" fitting after the main shut-off valve so a future landscape irrigation system can tap in, unless the development already runs on well water.
The 2025 Edition of the California Plumbing Code, as adopted and amended by the California Building Standards Commission in the 2025 California Building Standards Code, Title 24 of the California Code of Regulations, ... with the amendments set forth in Section 8.01.080. ... In the construction of all new single-family dwellings and single family attached dwellings, including duplexes, a "T" type fitting shall be installed after the house water shut-off valve for future irrigation systems. This "T" type fitting shall be a minimum of 3/4 inches in diameter and have a threaded termination with a plug or cap. Exception: Developments provided with irrigation well water supply shall be connected to and use such water for their landscape watering.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4915048; v22 updated 2026-05-19).
Full Breakdown
080. 1: every new single-family dwelling and single-family attached dwelling, including a duplex, must have a "T" fitting installed after the house's main water shut-off valve, sized at least 3/4 inches in diameter with a threaded plug or cap, so a future landscape irrigation system can be connected without cutting into finished plumbing later. That requirement drops away for developments already supplied by an irrigation well, which must use that well water for landscaping instead of tapping the domestic line. 3 so that pot sinks, scullery sinks, dishwashing sinks, and similar fixtures must connect indirectly to the drainage system rather than tying in directly. 160, carrying up to $1,000 and six months in jail per day of violation.
Violations & Fines
Skipping a plumbing permit, or building a new single-family home without the required future-irrigation T-fitting or the indirect-waste connections required for fixtures like scullery or dishwashing sinks, is enforced as a building code violation under Section 8.01.160: a misdemeanor with up to $1,000 and six months in jail per day it continues.
Frequently Asked Questions
Why does my new Davis home need a plumbing "T" fitting?
Is there an exception to the irrigation fitting rule?
Do I need a permit for plumbing work in Davis?
Sources & Official References
Other rules in Davis
California rules heatmap·Compare Davis to another location·View the California building safety overview
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