In the House · In brief
Every Water Heater in California Must Be Strapped
Water heater strapping in California is required for new, replacement and existing home heaters, with straps in the upper and lower thirds and the lower one at least 4 inches above the controls.
By the Ranch House Water desk · Updated · 2 min read
California treats a loose water heater as an earthquake hazard, and the rule that follows is Health and Safety Code §19211, which says all new and replacement water heaters, and all existing residential ones, must be braced, anchored or strapped to resist falling or sliding sideways in an earthquake.
Where do the straps go?
The law points to the California Plumbing Code. Code excerpts reprinted in a 2020 San Bernardino County handout say one strap goes within the upper third of the heater's height and one within the lower third, and the lower strap must sit at least 4 inches above the controls. That handout reflects an earlier code edition. The 2025 California Plumbing Code took effect on January 1, 2026, so check the current requirement with SLO County Planning & Building.
The same excerpts require that a heater in a garage have its burners and ignition devices at least 18 inches above the floor unless it is listed as flammable vapor ignition resistant. The law covers standard heaters of up to 120 gallons for which a pre-engineered strapping kit is readily available.
Who checks, and who does the work?
Owners can look for themselves: two straps, wrapped around the tank and fixed firmly to the wall framing, with the lower one clear of the controls. When a house sells, the law requires the seller to certify to the buyer that the heater complies.
Installing a heater is plumbing work in the C-36 classification, and work needing a permit is not covered by the $1,000 minor-work exemption under B&P Code §7048. Gas lines, venting and electrical connections stay with a licensed pro, and the relief valve and its drain must never be capped or blocked. Our story on water heaters and hard water covers upkeep, and plumbing in older ranch houses covers what else to check in an older home.
Sources
- California Legislature — Health and Safety Code §19211 — strapping requirement, seller certification, 120 gallons
- San Bernardino County — Water heater code excerpts (Rev. 01/20) — strap positions, 4 inches, 18 inches in garages
- California Building Standards Commission — Codes — 2025 code effective January 1, 2026
- CSLB — C-36 Plumbing Contractor — water heating installation
- California Legislature — B&P Code §7048 — $1,000 minor-work limit