(a) Firemain systems may be discharged for testing and inspections of the firemain system. To the greatest extent practicable, conduct maintenance and training outside of port and as far away from shore as possible. Firemain systems may be discharged in port for certification, maintenance, and training requirements if the intake comes directly from the surrounding waters or potable water supplies and there are no additions (e.g., aqueous film-forming foam) to the discharge.

(b) Firemain systems must not be discharged in federally-protected waters except when needed to washdown the anchor chain to comply with anchor washdown requirements in Subpart 1700.16.

(c) Firemain systems may be used for secondary uses if the intake comes directly from the surrounding waters or potable water supplies.