Sunday, January 4, 2009

Definition of Significant Industrial User Under New MPCA Pretreatment Rules

The new wastewater pretreatment rules (Minnesota Rules 7049) became effective on October 27, 2008. One of the key elements of the new Rule is the designation of Significant Industrial Users.

Under the new Rules, a "Significant Industrial User" means an industrial user that:

(1) contributes a process wastewater containing 5% or more of the flow or load of any pollutant of concern to the receiving POTW;
(2) is designated by MPCA or the POTW as significant on the basis that it has reasonable potential to impact the receiving POTW plant, or violate required pretreatment standards; or
(3) discharges 25,000 gallons per day or more of process wastewater.

Any industrial user that is subject to national categorical pretreatment standards may also be considered a Significant Industrial User.


Caltha LLP provides technical consulting services to industrial dischargers to meet POTW requirements.

For further information, contact Caltha LLP at:
Email: info@calthacompany.com
Phone: (763) 208-6430
Website: www.calthacompany.com

Two Minnesota offices - Minneapolis and Pine River

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