Section 809.33. Surface water microbiological organisms and indicators.

 

(1)   General requirements. The requirements in this section establish or extend treatment techniques in lieu of maximum contaminant levels for Cryptosporidium. These requirements are in addition to requirements for filtration and disinfection in subch. II of ch. NR 810 .

(2)   Applicability. These requirements apply to all surface water and GWUDI public water systems.

(a) Wholesale systems that supply water from a surface water or GWUDI source shall comply with the requirements of this section based on the population of the largest public water system in the combined distribution system.

(b) The requirements of this section for filtered public water systems apply to all public water systems required by s. NR 810.29 to provide filtration treatment, whether or not the public water system is currently operating a filtration system.

(c) The requirements of this section for unfiltered public water systems apply only to unfiltered public water systems that met and continue to meet the filtration avoidance criteria in s. NR 810.30 as applicable.

(3)   Requirements. Public water systems subject to this section shall comply with the following requirements:

(a) The following monitoring is required under this section:

1. Water suppliers shall have conducted and submitted to EPA an initial round of source water monitoring for treatment plants existing as of January 5, 2006 under 40 CFR part 141 National Primary Drinking Water Regulations Subpart W that determined the level of treatment for Cryptosporidium needed under s. NR 810.34 .

2. Water suppliers shall conduct source water monitoring as part of the treatment approval process for plants constructed after January 5, 2006 under s. NR 811.21 (1) (f) . This monitoring shall include Cryptosporidium, E. coli, and turbidity to determine what level of Cryptosporidium treatment shall be provided using the requirements of the bin classifications under s. NR 810.34 .

3. A second round of source water monitoring for each plant that treats a surface water or GWUDI source shall be conducted by the water supplier and submitted to the department as required in s. NR 809.331 (2) . This monitoring may include sampling for Cryptosporidium, E. coli, and turbidity as described in ss. NR 809.331 to 809.336 , to determine what level, if any, of additional Cryptosporidium treatment the public water system shall provide.

(b) Water suppliers that plan to make a significant change to the disinfection practice at a public water system shall develop disinfection profiles and calculate disinfection benchmarks, as described in s. NR 810.32 .

(c) Water suppliers for filtered public water systems shall determine their Cryptosporidium treatment bin classification as described in s. NR 810.34 and provide additional treatment for Cryptosporidium, if required, as described in s. NR 810.35 . All unfiltered public water systems shall provide treatment for Cryptosporidium as described in s. NR 810.36 . Filtered and unfiltered public water systems shall implement Cryptosporidium treatment according to the schedule in s. NR 810.37 .

(d) Water suppliers for public water systems with an uncovered finished water storage facilities shall comply with the requirements to cover the facility or treat the discharge from the facility as described in s. NR 810.28 .

(e) Water suppliers for public water systems required to provide additional treatment for Cryptosporidium shall implement microbial toolbox options that are designed and operated as described in ss. NR 810.41 to 810.46 .

(f) Water supplier shall comply with the applicable recordkeeping and reporting requirements described in ss. NR 809.336 and 809.82 .

(4)   Surface water treatment technique violations. Surface water and GWUDI public water systems are in violation of the treatment technique requirements for turbidity if any of the requirements of s. NR 810.29 (1) to (4) are not met.

CR 09-073 : cr. Register November 2010 No. 659 , eff. 12-1-10; CR 15-049 : am. (4) Register March 2016 No. 723 , eff. 4-1-16.