(a) Discharge or disposal. Filter backwash water and drainage water that is not reused in a lagoon shall be discharged or disposed of in accordance with the requirements of TCEQ or local regulatory authority.
(b) No direct connection. No direct mechanical (hard) connection shall be made between the lagoon, the lagoon drain, the chemical treatment equipment, or the system of piping and the sanitary sewer system, septic system, or other wastewater disposal system.
(c) Backwash water. Backwash water and lagoon draining water shall be discharged through an air gap formed by positioning the discharge pipe opening at least two pipe diameters above the overflow level of any barriers that could cause flooding and submergence of the discharge opening or by other means in accordance with TCEQ requirements. Splash screening barriers are permitted as long as the barriers do not destroy air gap effectiveness.
(d) On-site sewage facility wastewater disposal lines. On-site sewage facility wastewater disposal lines shall be located in compliance with 30 TAC §285.31 (relating to Selection Criteria for Treatment and Disposal Systems) or local regulatory requirements.
(e) Other wastewater or drainage water disposal facilities or lines. The location of other wastewater disposal facilities or lines shall meet applicable standards of 30 TAC, Chapter 307, Texas Surface Water Quality Standards, Chapter 308, Criteria and Standards for the National Pollutant Discharge Elimination System, Chapter 311, Watershed Protection, and Chapter 315, Pretreatment Regulations for Existing and New Sources of Pollution, or local regulatory authority.

Source Note: The provisions of this §265.164 adopted to be effective March 1, 2020, 45 TexReg 1024