San Francisco — Access & Water Supply

Last reviewed: July 6, 2026

Overview

This page distills what the San Francisco Fire Code requires for on-site fire department access and fire protection water supplies—how close engines must get, how many hydrants you need and where, and when water must be available. San Francisco largely follows the California Fire Code for access roads (§ 503) and water supplies (§ 507) with important local amendments for hydrant clearances, cistern access, and how water-flow data are issued. Use this as a coordination checklist alongside your San Francisco Fire Code, your building’s plans under the California Building Standards Code, and your planning approvals under the San Francisco Planning Code.

Key rule in plain English: Keep a full 5 feet of clear space around every hydrant in San Francisco—more than the statewide 3 feet—so crews can connect and flow water quickly (§ 507.5.5 [For SF] ).

What the San Francisco Fire Code requires

Citywide scope and how to use this page

• Fire department access roads and on-site water supply apply citywide, across all use districts; they are separate from zoning controls like Use Districts, Height & Bulk, and Setbacks & Yards.
• The California Fire Code baseline governs fire apparatus access and water supply, with local San Francisco amendments layered on top (§ 501–§ 507; see cites throughout). Construction-phase access and water supply are also controlled in Chapter 33 fire-safety provisions (§ 3307 ).
• Coordinate early with the Fire Department water-flow service (local § 507.4 [For SF]) and your permitting team (Permits & Inspections).

Fire department access (roads, reach, turning, grades, gates)

• Provide approved fire apparatus access roads to every new building or facility so that crews can get within 150 feet of all portions of the exterior first-story walls, measured along an approved route (§ 503.1.1 ).
  • The fire code official can increase the 150‑foot reach where the building is fully sprinklered, where conditions prevent installing roads and alternative protection is provided, or for up to two small residential/utility buildings (§ 503.1.1 Exceptions ).
  • The fire code official may require more than one access road if a single route could be compromised (§ 503.1.2 ).
• Minimum road specifications (used by the Fire Department for design review) are set in Appendix D:
  • Provide an all-weather surface capable of supporting a 75,000‑pound apparatus (§ D102.1 ).
  • Where a hydrant is on the access road, the minimum clear road width is 26 feet; otherwise use Appendix D tables to size width and turnarounds (§ D103.1 and Table D103.4 ).
  • Maximum grade is 10%, unless a steeper grade is explicitly approved (§ D103.2 ).
  • Dead-ends over 150 feet require approved turnarounds per Table D103.4 (e.g., 60‑foot “Y”, hammerhead, or 96‑foot cul-de-sac) (§ D103.4 ).
  • Gates across access roads must meet width, operability, and emergency-opening standards, and Fire Department keying is required (§ D103.5 ; § 506.2.1 [For SF] referencing Admin. Bulletin 5.09 ).
• Access and/or water supply must be installed and serviceable before and during construction unless an approved alternative is provided (§ 501.4 ).

Water supply, fire flow, and hydrants

• Every project must have an approved water supply capable of delivering the required fire flow (§ 507.1 ). Water supplies can be public mains, tanks, reservoirs, or other fixed systems (§ 507.2–§ 507.2.2 ).
• Fire flow must be determined by an approved method or Appendix B (as applicable to your project) (§ 507.3 ). The Fire Department offers a local service to issue water-flow/supply information, valid for one year from issuance to building-permit submittal (§ 507.4 [For SF] ).
• Hydrants and distribution:
  • Provide hydrants as required so that any portion of a new building is within 400 feet of a hydrant measured along an approved exterior route; the distance increases to 600 feet for fully sprinklered Group R‑3 and U occupancies (§ 507.5.1 ).
  • Where standpipes are installed, place a hydrant within 100 feet of each fire department connection (FDC), unless the fire code official approves a greater distance (§ 507.5.1.1 ).
  • Determine hydrant number and spacing by Appendix C or an approved method (§ 507.5 ). Not found in retrieved materials: whether San Francisco has formally adopted Appendix C for all occupancies—verify with the Fire Department.
• Hydrant access and protection:
  • Do not obstruct hydrants; maintain immediate access at all times (§ 507.5.4 ).
  • Maintain a full 5‑foot clear space around the entire hydrant circumference citywide (§ 507.5.5 [For SF] ).
  • Protect hydrants from vehicle impact where needed (§ 507.5.6 via § 312 ).
• Other water sources:
  • If using tanks or pools as auxiliary supplies, provide a 6‑inch draft connection from the bottom of the tank to a Fire Department–designated point; below-grade tanks must be designed for drafting by apparatus (§ 507.6, with listed exceptions ).
  • Keep a 5‑foot clear zone around underground emergency water-supply cistern openings; access openings must be on the same level as the cistern (§ 507.5.3.1 [For SF] ).
  • San Francisco’s Auxiliary Water Supply System (AWSS) installations/modifications must also comply with the Subdivision Code and SFPUC requirements (§ 507.7 [For SF] ). Details are not specified in the Fire Code—Verify with the jurisdiction.

During construction: temporary access and water

• Provide approved vehicle access to all construction/demolition sites; maintain access to within 100 feet of temporary or permanent FDCs on an all-weather surface (§ 3307.1 ).
• When combustible materials arrive on site, provide a minimum fire flow of 500 gpm; the supplying hydrant must be within 500 feet along an approved access lane (§ 3307.2.1 ).
• For vertical construction of Types III, IV, and V using combustible materials, provide required fire flow with enough hydrants for coverage as construction proceeds (§ 3307.2.2 ).

How this interacts with your broader approvals

• Fire access lanes, hydrants, and tanks are separate from zoning or design controls, but they will affect site planning (curb cuts, setbacks, and frontage treatments). Coordinate with your planning approvals under the San Francisco zoning & planning overview and any Conditional Use needs early to avoid redesign.
• If you are adding units or an accessory unit, any new structures still must meet access/hydrant rules in addition to ADU and housing requirements.

Quick-reference standards

Checklist

• Confirm an approved fire apparatus access route reaches all exterior portions within 150 ft, or obtain approval for any exception (§ 503.1.1 ).
• Size and design access roads for width, grade, turning, loading, and gates per Appendix D and local practice (§ D102.1, § D103.1–§ D103.5 ).
• Request SFFD water-flow/supply information and use it to size fire flow; note the 1‑year validity to your permit submittal (§ 507.4 [For SF] ).
• Provide hydrant coverage so no point of the building is beyond the allowed distance; add hydrants if required (§ 507.5.1 ).
• Place hydrants within 100 ft of each FDC where standpipes are present (§ 507.5.1.1 ).
• Keep hydrants unobstructed with a 5‑ft clear zone all around; add bollards if vehicle impact is likely (§ 507.5.4–§ 507.5.6; SF amendment § 507.5.5 ).
• If using tanks/pools: provide a 6‑inch draft connection and 5‑ft clear around underground cistern openings (§ 507.6; § 507.5.3.1 [For SF] ).
• For construction: establish access and a temporary water supply (≥500 gpm; hydrant within 500 ft) as soon as combustibles arrive (§ 3307.1–§ 3307.2.1 ).
• Coordinate any AWSS obligations with SFPUC if subdivisions or AWSS mains are implicated (§ 507.7 [For SF] ).
• Install key boxes where required and coordinate gate emergency access with SFFD (Admin. Bulletin 5.09 via § 506.2.1 [For SF] ).

Risks & Ambiguities

Plain-English Summary

No matter your zoning, San Francisco requires a fire engine to get close to your building and a reliable water supply to fight a fire. Plan an all‑weather access lane that reaches within 150 feet of the building, provide hydrant coverage within required distances, keep 5 feet clear around hydrants, and, if you use tanks or cisterns, include a 6‑inch draft connection. Get SFFD’s water‑flow letter early and make temporary access and water available during construction so your project doesn’t stall.

Information Gaps

• Whether San Francisco has formally adopted California Fire Code Appendices B, C, and D for all occupancies: Not found in retrieved materials.
• Citywide rules for counting hydrants on adjacent private property for non-school occupancies: Not found in retrieved materials.
• Any additional local standards for road widths/turning beyond Appendix D: Not found in retrieved materials.
• Specific AWSS design triggers and standards (live under SFPUC/Subdivision Code, not the Fire Code text): Verify with the jurisdiction.

Source References

• California Fire Code (Fire service features; access and water supply): § 501.4; § 503.1–§ 503.2; § 507.1–§ 507.5.6; Ch. 33 (§ 3307)
• California Fire Code Appendix D (access road loading, width, grade, turnarounds, gates): § D102.1; § D103.1–§ D103.5; Table D103.4
• San Francisco Fire Code local amendments (hydrant clearance, cistern clearance, water-flow service, AWSS, key boxes): § 507.4 [For SF]; § 507.5.3.1 [For SF]; § 507.5.5 [For SF]; § 507.6–§ 507.7; § 506.2.1 [For SF]
• San Francisco Fire Code overview page (reference hub): https://gocodebook.com/us/california/san-francisco/fire-code

Retrieved passages

• CFC § 903.3.1.1 (Section 903.3.1.1) High relevance show source text
• CFC § 506 (SECTION 506.) High relevance show source text
• CFC § 506 (SECTION 506.) High relevance show source text
• CWUIC § 1274.04 (Title 14) High relevance show source text
• CWUIC § 401 (Chapter 4) High relevance show source text
• CFC § 506.1 (Section 506.1.) High relevance show source text
• CFC § 1103.7.6 (Section 1103.7.6) High relevance show source text
• CFC § 906 (Section 906) High relevance show source text

Cited sections

• California Fire Code (Fire service features; access and water supply): § 501.4; § 503.1–§ 503.2; § 507.1–§ 507.5.6; Ch. 33 (§ 3307) (§ 501.4)
• California Fire Code Appendix D (access road loading, width, grade, turnarounds, gates): § D102.1; § D103.1–§ D103.5; Table D103.4 (§ D102.1)
• San Francisco Fire Code local amendments (hydrant clearance, cistern clearance, water-flow service, AWSS, key boxes): § 507.4 [For SF]; § 507.5.3.1 [For SF]; § 507.5.5 [For SF]; § 507.6–§ 507.7; § 506.2.1 [For SF] (§ 507.4)
• San Francisco Fire Code overview page (reference hub):
• SF Fire Code.md
• 2025 California Fire Code.md