- (a) The O/O of a groundwater system who installs a new treatment process after December 1, 2009, specifically for purposes of disinfection shall meet 4-log treatment unless the O/O demonstrates, by conducting the 6 months of sampling described in Env-Dw 717.07(a), that the groundwater is free from fecal contamination.
(b) The O/O of a groundwater system who installs a new treatment process after December 1, 2009, that includes disinfection shall meet 4-log treatment unless the system:
- (1) Has not had any acute violations of the microbiological MCL within the past 3 years; and
- (2) Has no outstanding significant deficiencies.
- (c) If the department determines that 4-log treatment is not required pursuant to (a) or (b), above, the O/O shall be subject to the triggered monitoring requirements of Env-Dw 717.11.
Source. #9600, eff 11-21-09; ss by #12525, eff 6-1-18