Environmental Protection › DEP Waste Management › Chapter 62-565 · Potable Reuse

Rule 62-565.540. Monitoring Requirements for Advanced Treatment Water Facilities and Potable Reuse Systems

Amended February 26, 2025 (current)

(1) For the purposes of this Chapter, all analytes and parameters shall be measured using approved EPA drinking water test methods, as identified in Rule 62-550.550, F.A.C. When an approved EPA drinking water test method is unavailable, other accepted published methods approved by the department shall be used for measuring.

(3) ATWFs discharging to surface waters of the state shall also be subject to the applicable monitoring requirements established in Chapters 62-302, and 62-304, F.A.C.

(4) For Giardia lamblia, Cryptosporidium, and enteric viruses, if there are no detects in the advanced treated water for two years, the permittee may notify the Department of the applicant’s intent to transition to bi-annual monitoring.

(5) With the exception of radionuclides, for the parameters listed in Table 1 which have an established MCL, if there are no exceedances of one half of the established MCL in finished advanced treated water samples for one year, the permittee may notify the Department of the applicant’s intent to transition to quarterly sampling.

(6) With the exception of radionuclides, for the parameters listed in Table 1 which have an established MCL, if there are no exceedances of one half of the established MCL in finished advanced treated water samples for two years following the transition to quarterly sampling, the permittee may notify the Department of the applicant’s intent to transition to bi-annual sampling.

(7) For the radionuclides identified in Table 1, if there are no exceedances of one half of the established MCL in finished advanced treated water samples for one year, the permittee may notify the Department of the applicant’s intent to transition to quarterly sampling.

(8) For the radionuclides identified in Table 1, if there are no exceedances of one half of the established MCL in finished advanced treated water samples for one year following the transition to quarterly sampling, the permittee may notify the Department of the applicant’s intent to transition to annual sampling.

(9) For the PFAS and HI identified in Table 1, if there are no exceedances of one half of the established MCL for all PFAS and HI constituents in finished advanced treated water samples for one year, the permittee may notify the Department of the applicant’s intent to transition to triennial sampling.

(10) For the PFAS and HI identified in Table 1, if there are no exceedances of the MCL for all PFAS and HI constituents in finished advanced treated water samples for one year, the permittee may notify the Department of the applicant’s intent to transition to annual sampling.

(11) If a permittee is on reduced monitoring for any of the parameters identified in subsections 62-565.540(4)-(10), F.A.C., and does not meet the reduced monitoring criteria for any sampling event, the permittee shall resume monitoring in accordance with the frequencies outlined in Table 1 for that parameter.

(12) Continuous Monitoring of pH.

(a) The permittee shall maintain the pH of reclaimed water and advanced treated water within the range set forth in the ATWF permit, except excursions from the range are permitted subject to the following limitations:

1. The total time during which the pH values are outside the required range of pH values shall not exceed 7 hours and 26 minutes in any calendar month; and

2. No individual excursion from the range of pH values shall exceed 60 minutes.

(b) The applicant may request an adjustment of the requirements set forth in paragraph (a) of this subsection with respect to the length of individual excursions from the range of pH values, and the Department shall approve the requested adjustment if a different period of time is appropriate based upon the treatment system, plant configuration or other related technical factors.

(c) An excursion is an unintentional and temporary incident in which the pH value of reclaimed water or advanced treated water exceeds the range set forth in the advanced treatment water facility permit.

(13) The Department shall allow use of continuous monitoring equipment, for those parameters identified in Table 1 requiring a grab sample, if all of the following conditions are met:

(a) The applicant provides an affirmative demonstration that the proposed monitoring equipment will provide a means for controlling the process that is at least as reliable and accurate as a grab sample.

(b) The proposed monitoring equipment will generate a continuous reading.

(c) The proposed monitoring equipment will be equipped with an automated data logging or recording device.

(d) The proposed monitoring equipment shall be calibrated according to the requirements of Chapter 62-160, F.A.C.

(e) The proposed monitoring equipment shall be maintained according to the manufacturer’s operation and maintenance instructions.

(f) The use of the proposed monitoring equipment and setpoints associated with use of the proposed monitoring equipment shall be fully incorporated into the operating protocol.

(14) In addition to the monitoring requirements established in subsection 62-565.540(2), F.A.C., ATWFs shall conduct semi-annual sampling of the water entering and exiting the ATWF for the toxic pollutants that have been identified under 40 CFR Part 122, Appendix D, (adopted and incorporated by reference in paragraph 62-620.100(3)(b), F.A.C., effective October 8, 2021).

(15) Monitoring Locations.

(a) All samples shall be collected in accordance with the monitoring locations identified in table 1 above.

(b) For influent sampling, a minimum of one sample shall be taken at every entry point to the treatment system that is representative of each source before treatment. If an ATWF draws water from more than one source and the sources are combined before treatment, samples shall be taken at an entry point to the treatment system during periods of typical operating conditions (e.g., when water is representative of the sources being used).

(c) For effluent sampling, a minimum of one sample shall be taken at every discharge point from the treatment system that is representative of the advanced treated water leaving the ATWF prior to blending with other sources of water. For ATWFs involving high-level disinfection, compliance with the TSS limitations shall be achieved, and sampled for, after filtration and before application of the disinfectant.

(d) For internal outfall sampling, a minimum of one sample shall be taken at the internal outfall or outfalls identified in the Department approved Operating Protocol.

(e) The location of monitoring sites shall meet the requirements set forth in subsection 62-565.500(11), F.A.C.

(f) Sampling shall demonstrate compliance with the TBTRs for emerging constituents , pathogen reduction, and site-specific indicator compound and surrogate parameter requirements set forth in this chapter.

(g) Samples shall be taken at the monitoring sites specified in the permit, unless the permittee receives prior approval from the Department to use an alternate site where a represenatitve sample can be collected.

(16) Grab samples shall be collected during periods of minimal treatment plant pollutant removal efficiencies. The actual time and flow conditions during which such samples are taken shall be recorded. Rulemaking Authority 403.861(9), 403.064(17) FS. Law Implemented 403.852(12), 403.861(7), 403.853(6), 403.861(17), 403.064(17) FS. History – New 2-26-25.