1. (a) The owner of an NCWS monitoring bacteria at the frequency established by Env-Dw 709.01(b) shall return to the standard bacteria monitoring frequency if:

   1. (1) The NCWS:

      1. a. Has a bacteria monitoring violation;
      2. b. Has been required to issue a boil order in accordance with Env-Dw 709.19; or
      3. c. Has installed a continuously-operating bacterial disinfection or inactivation treatment process within 6 months of incurring a bacterial MCL violation.
   2. (2) The physical configuration of the NCWS warrants additional monitoring to accurately determine water quality; or
   3. (3) The department learns of an activity or circumstance that makes the source vulnerable to pathogenic contamination.
2. (b) If the department determines that any of the criteria listed in (a) above, has been met, the department shall notify the NCWS owner in writing of its determination and that Env-Dw 709.09(a) requires the system to return to monitoring for total coliforms at the standard quarterly frequency.

Source. #9700, eff 5-1-10; ss by #10771, eff 2-1-15; ss by 14343, eff 8-22-25, EXPIRES: 8-22-35