PWS systems must avoid dead-ends in the distribution system. Where a dead-end main exists, it must be equipped with a valve or other arrangement for flushing. Flush until the water is clear or a chlorine residual is found. Flush every ninety (90) days or more often where conditions require.

Added at 17 Ok Reg 1987, eff 6-12-00

Amended at 20 Ok Reg 1153, eff 6-1-03