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Required Reassessments of Technically Based Local Limits (TBLLs)

Requirements and steps for reassessing technically-based local limits.

If you have an approved pretreatment program, within 60 days after your Texas Pollutant Discharge Elimination System (TPDES) permit is issued, renewed, or amended, you must reassess your existing technically based local limits (TBLLs). The TPDES permit will contain these types of options:

  • Within 60 days, submit to the TCEQ Pretreatment Program a written certification that you have reassessed your TBLLs. This reassessment must demonstrate that the existing TBLLs are protecting the POTW and receiving stream. To follow this option:

    • You must submit a completed TBLLs Reassessment FormAdobe Acrobat PDF Document (TCEQ-20221). (Help with PDF.)

    • The certification statement on this form must be signed by your POTW's authorized representative.

  • Within 60 days, submit to the TCEQ Pretreatment Program a written notification that new TBLLs will be developed and submitted to us for review and approval within 12 months of the date the permit was issued. To follow this option:

    • You may notify us with a letter or with a completed TBLLs Reassessment Form.

    • If you notify by letter, you must enclose a certification statement that is signed by your POTW's authorized representative.

    • If you submit a completed TBLLs Reassessment FormAdobe Acrobat PDF Document (TCEQ-20221), the certification statement on the form must be signed by your POTW's authorized representative.

    • Any new or revised TBLLs must be submitted along with any necessary supporting documents no more than one year from the date the permit was issued.

The TBLLs reassessment documentation and certification statement need to be:

  • signed by the POTW’s authorized representative, and

  • submitted to the TCEQ Pretreatment Program.

Related content
What Are "Local Limits"?