“Reliably and consistently below the MCL” means, for a particular contaminant, that each water quality test result is less than 80% of the applicable MCL based on sampling for at least 4 consecutive quarters.

Source. (See Revision Note at chapter heading for Env-Dw 100) #10606, eff 6-1-14; renumbered by #10770 (from Env-Dw 103.44); renumbered by #12180 (from Env-Dw 103.45)