>> Questions or Comments: wqap@tceq.texas.gov
You are here:

What Is a "Categorical Industrial User"?

Definition of and requirements for categorical industrial users (CIUs).

A categorical industrial user (CIU) is a facility that meets these conditions:

If you are a CIU, then you must comply with the categorical pretreatment standards specified in the federal regulations and any local limits established by the POTW that receives your wastewater discharges.

For assistance to determine whether you are a CIU, please submit a "Request for a Categorical Determination" to the TCEQ. The application requirements are listed in 40 CFR §403.6Exit the TCEQ.

Contact us if you have questions.