Guidance

Downloads folder for Plan and Technical Review Guidance
RG - 559: Public Water System: Baffling Factors and T10 Calculations

This guidance describes the method that TCEQ uses to determine baffling factors, basin volumes, and flow rates necessary to calculate the concentration time (CT) as required by TCEQ for disinfection processes. This guidance also provides a table with allowable baffling factors for various configurations and facilities.

RG - 560: Blending Chloraminated and Chlorinated Water

This guidance helps public water systems and their representatives submit an exception to blend chloraminated and chlorinated waters. Blending scenarios covered include isolating areas with different disinfectants; and blending in distribution, in a storage tank, and during emergencies.

RG - 562: How to Protect Aerators and Cooling Towers

This guidance provides information on the use of aerators and cooling towers and the required protection of the drinking water source with the use of these facilities. This guidance also notes that if aerators or cooling towers are used to reduce trihalomethanes (THMs), an exception may be required.

RG - 563: Public Water System: How to Use Chlorine Dioxide

This guidance lists the information required for an exception request to use chlorine dioxide as a disinfectant or for aesthetic purposes (taste and odor). It explains the monitoring and reporting requirements for the use of chlorine dioxide, as well as the approval process for the associated facilities.

RG - 565: Public Water Systems: Meeting Treatment Technique Requirements for Cryptosporidium, Giardia, and Viruses

This guidance provides a brief overview of Surface Water Treatment Rules (SWTRs) and outlines how to comply with their requirements for treatment techniques. Surface Water Treatment Plants must provide at least the amount of pathogen treatment required by their Bin classification. This guidance explains the BIN classification process and provides options for pathogen removal and inactivation.

RG - 570: UV Disinfection for Pathogen Inactivation Credit

This guidance lists the information a public water system must submit to request an exception to use ultraviolet (UV) light disinfection for pathogen inactivation credit. Prior to the exception request, TCEQ must have reviewed and approved a validation study for the selected UV reactor.