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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. You must demonstrate that the existing TBLLs are protecting your public owned treatment works (POTW) and receiving stream. To follow this option:

    • Submit a completed TBLLs Reassessment FormAdobe Acrobat PDF Document (TCEQ-20221).

    • Have your POTW's authorized representative sign the certification statement on the form.

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 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.

  • Submit any new or revised TBLLs an any necessary supporting documents no more than one year from the date the permit was issued.

For either option, submit all documentation, forms, letters or any other required certification to:

Texas Commission on Environmental Quality
Water Quality Division
Wastewater Permitting Section
Stormwater & Pretreatment Team MC-148
P.O. Box 13087
Austin, Texas 78711-3087

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