(a) The board, when acting as a responsible agency, may prohibit, postpone, or condition the discharge of waste and may deny, postpone, or condition water recycling requirements or other entitlement for use for any project subject to CEQA to protect against environmental damage to water resources, to minimize adverse environmental impacts on water resources, or to ensure long-term protection of water resources, or if the information required pursuant to sections 3740 and 3741 has not been timely submitted to the board. The board's authority under this subdivision is limited to the protection of water resources within its purview.

(b) The board, when acting as lead agency, may prohibit, postpone, or condition the discharge of waste and may deny, postpone, or condition water recycling requirements or other entitlements for use for any project to protect against environmental damage, to prevent nuisance, to minimize adverse environmental impacts, or to ensure long-term protection of the environment, or if the information required pursuant to sections 3740 and 3741 has not been timely submitted to the board.