Section 611.952  Additional Watershed Control Requirements for Unfiltered Systems

a)         Applicability.  A Subpart B system supplier that serves fewer than 10,000 persons that does not provide filtration must continue to comply with all of the filtration avoidance criteria in Sections 611.211 and 611.230 through 611.233, as well as the additional watershed control requirements in subsection (b).

b)         Requirements to Avoid Filtration.  A supplier must take any additional steps necessary to minimize the potential for contamination by Cryptosporidium oocysts in the source water.  A watershed control program must fulfill the following for Cryptosporidium:

1)         The program must identify watershed characteristics and activities that may have an adverse effect on source water quality; and

2)         The program must monitor the occurrence of activities that may have an adverse effect on source water quality.

c)         Determination of Adequacy of Control Requirements.  During an onsite inspection conducted under the provisions of Section 611.232(c), the Agency must determine whether a watershed control program is adequate to limit potential contamination by Cryptosporidium oocysts.  The adequacy of the program must be based on the comprehensiveness of the watershed review; the effectiveness of the program to monitor and control detrimental activities occurring in the watershed; and the extent to which the supplier has maximized land ownership or controlled land use within the watershed.

BOARD NOTE:  Derived from 40 CFR 141.520 through 141.522.

(Source:  Amended at 44 Ill. Reg. 6996, effective April 17, 2020)