This updated operations manual provides specific guidance on the design, operation, and maintenance of water distribution systems that supply water for fire protection and suppression. This work is an industry peer-reviewed reference that lays out standard practices in relation to fire suppression. Four methods of fire protection are discussed in relation to how water utilities should design and operate their systems to maximize fire protection benefits while delivering safe, potable water to customers. The emphasis is on public water systems and covers the National Fire Academy method. Coverage includes fire flow requirements and examines criteria for system design, demand, and storage.