Code of Federal Regulations Title 40. Protection of Environment § 40.141.171 Criteria for avoiding filtration

(a) Site-specific conditions. In addition to site-specific conditions in § 141.71(b), systems must maintain the watershed control program under § 141.71(b)(2) to minimize the potential for contamination by Cryptosporidium oocysts in the source water. The watershed control program must, for Cryptosporidium:

(b) During the onsite inspection conducted under the provisions of § 141.71(b)(3), the State must determine whether the watershed control program established under § 141.71(b)(2) 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 system's program to monitor and control detrimental activities occurring in the watershed;  and the extent to which the water system has maximized land ownership and/or controlled land use within the watershed.