The Florida Department of Environmental Protection (DEP) has amended its approval for the statewide use of reagent-less in-line chlorine meters to measure residual chlorine in reclaimed water at domestic wastewater facilities, which was issued in December 2020 pursuant to Rule 62-160.220, Florida Administrative Code (F.A.C.). The previous approval was specifically for in-line chlorine meters with an amperometric, 3-electrode sensor immersed in an electrolytic medium with a permeable membrane selective to chlorine. However, amperometric sensors that are not immersed in an electrolytic solution and do not have a membrane represent the same essential technology and are as effective at monitoring chlorine. Therefore, the amended final order for the alternative method approval is inclusive of both varieties of meters.

The amended final order approving the alternative method and the accompanying basis of approval are available on DEP's Aquatic Ecology and Quality Assurance Section Alternative Methods Approval webpage.

The statewide alternative method was exclusively approved for continuous analysis of residual chlorine in reclaimed water from domestic wastewater facilities.

Exceptions to this approval include where reclaimed water is:

• Directly discharged to surface waters of the state.
• Intentionally used as drinking water supply.
• Used to augment a drinking water supply.

This technology may not be used for other matrices or by another facility type without separate review and approval by DEP.

Please contact the quality assurance team for any questions regarding this notice at Quality_Assurance@FloridaDEP.gov.

Thank you for your commitment to quality assurance.