Antidegradation

New voluntary approach for small domestic wastewater treatment systems with design flows of less than 10,000 gallons per day:

  • The department conducted a general analysis of wastewater treatment alternatives for small systems in accordance with the Antidegradation Implementation Procedure, and concluded that there are several available technologies that are capable of producing a high quality effluent.  Applicants that wish to utilize this general analysis only need to complete three documents: The Antidegradation Review Request form, Attachment E, and the “No Discharge Evaluation” form.  This optional approach would allow applicants to forgo the preparation of a site-specific alternatives analysis and eliminate the need to submit the "Attachment A” form.
  • Section 10. of Attachment E provides a table of effluent limits that applicants will agree to accept using this approach.
  • This approach would only be available to new or expanding domestic wastewater treatment systems that will discharge to Tier 2 waters (those waters that are not impaired or are classified as Outstanding State State or National Resource Waters).
  • The “No Discharge Evaluation” form is used to demonstrate that land application or subsurface wastewater disposal is not feasible.
  • The fee for this review will be $500.

Fees: For a new wastewater treatment plant, if the design flow is less than 100,000 gallons per day the fee is $500; for a new wastewater treatment plant, if the design flow is equal to or more than 100,000 gallons per day the fee is $1000; for a review in which the existing wastewater treatment train is being retained as part of an upgrade or for a water quality review analysis the fee is $250.

Missouri Antidegradation Implementation Procedure - Approved July 13, 2016

Review Request Forms, Process Diagram, and Example Outline for Antidegradation Submittals

Resource Documents