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UFS 3-420-01 05 June 2026 UNIFIED FACILITIES SUPPLEMENT (UFS) APPROVED FOR PUBLIC RELEASE; DISTRIBUTION UNLIMITED PLUMBING SYSTEMS UFS 3-420-01 05 June 2026 FOREWORD Unified Facilities Supplements (UFS) provide non-mandatory, supplemental information in support of Unified Facilities Criteria (UFC). Only UFC establish enforceable criteria. UFS are For Information Only (FIO) and exist to help users understand and apply UFC requirements. The purpose of UFS is to offer procedural guidance, best practices, lessons learned, examples, and explanatory materials that clarify how to meet UFC criteria. They may include step-by-step procedures, checklists, illustrations, or decision aids, but they do not create new requirements or modify UFC content. UFS are developed by Discipline Working Groups (DWG

information and best practices based on experience and lessons learned. 1-3 DESIGN METHODS. Design methods are provided for design of appliances, equipment, or systems. 1-4 DESIGN ANALYSIS AND DRAWING REQUIREMENTS. The design analysis and drawing requirements chapter provides documentation requirements necessary to demonstrate compliance with UFC 3-420-01. UFS 3-420-01 05 June 2026 2 CHAPTER 2 BEST PRACTICES 2-1 CENTRAL DRINKING WATER SYSTEMS. Central drinking water systems should be evaluated as an alternative to unitary water coolers in facilities where 15 or more drinking stations are required. Evaluation should include potential heat recovery from central condenser, addition of heat to building envelope by unitary condensers, differences in anticipated energy usage, and differences in

ATER LEVELS AND WITHDRAWALS (Based on bottom outlet tanks and a 10 percent residual) PRESSURE RANGE psi (kPa) HIGH WATER LEVEL (percent of total tank capacity) WITHDRAWAL (96% of total tank capacity) 20-40 (140-275) 43 33 30-50 (205-345) 38 28 40-60 (275-415) 34 24 50-70 (345-480) 32 22 60-80 (415-550) 28 18 20-45 (140-310) 48 38 30-55 (205-380) 42 32 40-65 (275-450) 37 27 50-75 (345-520) 35 25 60-85 (415-590) 32 22 UFS 3-420-01 05 June 2026 10 CHAPTER 4 DESIGN ANALYSIS AND DRAWING REQUIREMENTS Provide the following in addition to the design analysis and drawing requirements in UFS 3-401-01: 4-1 DESIGN ANALYSIS. The Design Analysis must consist of a Basis of Design Narrative and Calculations demonstrating compliance with all UFC requirements. 4-1.1 Basis of Design Narrative Requirements. I

at DoD Owned or Operated Potable Water Treatment Plants, 18 Mar 2013. MIL-STD-3007, Standard Practice for Unified Facilities Criteria and Unified Facilities Guide Specifications, https://www.wbdg.org/dod/fedmil/mil-std-3007. OEBGD, Overseas Environmental Baseline Guidance Document, 1 May 2007. Unified Facilities Criteria, https://www.wbdg.org/dod/ufc UFC 1-200-01, DoD Building Code UFC 3-230-01, Water Storage, Distribution and Transmission UFC 3-420-01, Plumbing Systems UFC 3-600-01 Fire Protection Engineering for Facilities UFM 3-570-06, Operation and Maintenance: Cathodic Protection Systems UFM 3-601-02, Fire Protection Systems Inspection, Testing, and Maintenance UFS 3-190-06, Protective Coatings and Paints

and Section titled “Conflicts in Criteria.” Requirements in UFC 3-420-01, Section titled “Energy Efficiency in Water Conservation” and Section titled “Reliability” do not apply; however, consideration must be given to resource conservation where and when practical. See paragraph 1-11 of this UFC, “Resource Conservation.” Follow UFC 3-420-01, Section titled “Piping Arrangement.” Piping is not required to be concealed or painted. Follow UFC 3-420-01, Appendix A: IPC Chapter 1 “Administration” Supplements, Item A, Delete Chapter 1 in its entirety. Follow UFC 3-420-01, Appendix A: IPC Chapter 2 “Definitions” Supplements. 4-5.7 Plumbing - General Regulations. Follow the International Plumbing Code (IPC), Chapter 3, General Regulations, with the following exceptions: • Section 310.5, “Urinal Par

s unless required otherwise by UFC 1-200-01 and UFC 3-420-01. • Two-company station: Provide 1 water closet, 1 shower, and 1 lavatory for females, and provide 4 water closets, 4 showers, and 3 lavatories for males unless required otherwise by UFC 1-200-01 and UFC 3-420-01. For larger stations, consult with user, UFC 1-200-01, and UFC 3-420-01 for final fixture count but plan for concentrated usage of the toilets after a call and the disparity between male and female fixture counts. Note: Use of individual unisex shower/changing rooms as dictated by installation mission requirements is acceptable. Provide a janitor's closet associated with or in proximity to this room. This closet includes a floor mop sink with hot and cold water and a hose connection, a floor drain, and storage for pails,

ive • 4-215 Maintenance – Weapons, Spares • 4-216 Maintenance - Ammunition, Explosives, Toxins • 4-218 Maintenance - Facilities for Miscellaneous Procured Items and Equipment • 4-220 Production • 4-229 Production - DoD Maintenance, Repair, and Operation of Installations UFS 1-300-01 14 January 2026 34 A-4.3 4-300 Series - Research, Development, Test, and Evaluation Facilities. • 4-310 Science Laboratories • 4-390 Other Than Buildings A-4.4 4-400 Series - Supply Facilities. • 4-420 Ammunition Storage • 4-440 Storage - Covered • 4-442 Storage - Covered - Installation and Organizational • 4-450 Storage - Open • 4-451 Storage - Open - Depot A-4.5 4-500 Series - Hospital and Medical Facilities. • 4-510 Medical Center / Hospital A-4.6 4-600 Series - Administrative Facilities. • 4-610 Administrat

d by UFC 3-420-01) /3/ IPSDC, International Private Sewage Disposal Code, (same version as International Plumbing Code as required by UFC 3-420-01) Manufacturers Standardization Society of the Valve and Fittings Industry, Inc., 127 Park Street, NE, Vienna, Virginia 22180-4602 MSS SP-58-2018, Pipe Hangers and Supports, Materials, Design, Manufacture, Selection, Application, and Installation WATER ENVIRONMENT FEDERATION WEF MOP FD-3, Industrial Wastewater Management, Treatment, and Disposal, third edition CANCELLED