CSKT Natural Resources Department
Water Quality Program

The Confederated Salish and Kootenai Tribes (CSKT) are seeking public comment on proposed updates for the CSKT Water Quality Standards or any other aspects of the CSKT Water Quality Standards.  Request for public comment begins July 9, 2018 and will be accepting public comments until close of business August 23, 2018. A public hearing will be held on August 15, 2018 at 11:00 a.m. at the Tribal Council Chambers located at New Tribal Complex Building, 42487 Complex Blvd., Pablo, MT.

Requests for a copy of the revised standards can be sent to:
CSKT Natural Resources Department
Water Quality Program – Attention Paula Webster
PO Box 278
Pablo, MT 59855
Or request by email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Alternatively, the CSKT Water Quality Standards Document can be downloaded at: http://nrd.csktribes.org/. This document will be listed under the Featured Documents on the main page.  Proposed changes are denoted in red. New text is red and underlined. Deleted text is red with overstriking.

Comments can be submitted online to the same address listed above. You can find the form listed under Available Forms. Oral and written comments may be provided at the hearing, or written comments to the physical or email addresses above.


For more information, you may contact:
Paula Webster, CSKT Water Quality Program Manager, at 406-675-2700 ext. 7211.

The 2018 proposed updates:

  • The aquatic life criteria using the 2018 EPA National Recommended Water Quality Criteria - Aquatic Life Criteria Table
  • The human health criteria using the 2018 EPA National Recommended Water Quality Criteria - Human Health Criteria Table
  • The organoleptic effects (taste and odor) using the 2018 National Recommended Water Quality Criteria - Organoleptic Effects
  • A total of 122 priority pollutants and 48 non-priority pollutants were reviewed and updated.  Maximum contaminant levels (MCL’s) were also reviewed for both priority and non-priority pollutants.
  • The changes affected the acute and chronic aquatic life standards. Several human health standards were updated due to new scientific information made available for new calculations.

Changes of Note:

The Tribes are not adopting EPA’s new recommended criteria for ammonia. The new criteria are designed to protect particularly sensitive aquatic organisms (e.g., mussels and clams). The Tribes will determine the presence or absence of such sensitive species in Tribal waters before adopting the new ammonia criteria recommendations.

The Tribes are adopting the EPA’s new CWA 304(a) numeric criteria recommendations for fish-tissue-based criteria (e.g. for methylmercury and/or selenium). The CSKT Fisheries program has performed long-term fish tissue analysis of heavy metals (including mercury and selenium) to determine fish consumption guidelines for multiple fish species found within the waters of the Flathead Indian Reservation.  

The Tribes have added a compliance schedule section.  The Compliance Schedule details requirements that may be useful for NPDES permit holders on the Reservation.

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