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        Current and Past Actions

        The State Environmental Commission (SEC) is charged with adopting and amending regulations to carry out the provisions of the Water Pollution Control Law, including water quality standards. All WQS revisions, adopted by the SEC, are provided to the Legislative Council Bureau (LCB) for review and approval and incorporation into the Nevada Administrative Code. The U.S. Environmental Protection Agency has the final authority to approve, dissaprove, or take no action on the proposed water quality standards regulation. Below is a listing of our current WQS activities and all of our past WQS actions. Note: prior to September 1993, the water quality standards changes are kept on file within NDEP.

        Current Water Quality Standards Activities

        Temperature Water Quality Standards Review - The Bureau of Water Quality Planning has developed scientifically supported guidance for updating our temperature water quality standards in Nevada waters.  As NDEP reviews temperature standards throughout the state this guidence will be followed to establish proper temperature criteria for protection of aquatic life. 

        Past Water Quality Standards actions, as managed by the SEC

        Petition IDAdopted by SECEffective OnPetition to Change

        R048-93

        9/22/1993

        10/29/1993

        Truckee River standards

        R060-94

        5/26/1994

        7/5/1994

        Lake Mead Marina Campground Ammonia

        R059-94

        5/26/1994

        7/5/1994

        Aquatic standards for selected metals

        R112-94

        8/11/1994

        9/15/1994

        Carson River standards

        R031-95

        10/3/1995

        11/9/1995

        Lake Tahoe Basin standards

        R127-95

        11/7/1995

        11/29/1995

        Humboldt River standards

        R128-95

        11/7/1995

        11/29/1995

        Toxic materials and metals update

        R086-96

        10/22/1996

        11/27/1996

        Lake Tahoe Basin standards #2

        R062-98

        6/17/1998

        8/4/1998

        Las Vegas Bay satndards

        R110-96

        4/10/1999

        5/25/1999

        Lake Tahoe Basin Regulation Repeal

        R017-99

        9/9/1999

        9/27/1999

        Health Division drinking standard

        R104-00

        2/15/2001

        Not Filed

        Walker River and Lake standards

        R128-01

        12/11/2001

        1/18/2002

        Walker River standards

        R129-01

        12/11/2001

        1/18/2002

        Walker Lake standards

        R099-02

        11/19/2002

        12/17/2002

        Statewide Standards Amendments

        R-226-03

        2/26/2004

        4/23/2004

        Class Waters standards

        R-136-04

        11/30/2004

        2/17/2005

        Lake Mead and Las Vegas Bay standards

        R-158-06

        9/6/2006

        9/18/2006

        Toxic materials applicable to designated waters

        R-159-06

        9/6/2006

        9/18/2006

        Colorado River Salinity Standards

        R160-06

        6/17/2008

        8/26/2008

        Class water removal and standards tables

        R083-08

        6/17/2008

        8/26/2008

        Muddy River standards

        R186-08

        11/12/2008

        12/17/2008

        Molybdenum aquatic life standard

        R127-10

        10/5/2010

        12/16/2010

        Smoke, Bronco, and Gray Creeks standards

        R130-10

        10/5/2010

        12/16/2010

        Colorado River Salinity Standards

        R133-10

        10/5/2010

        12/16/2010

        Snake River Basin standards

        R129-10

        12/7/2010

        1/13/2011

        Class D Waters and Removal of Tribal waters

        R128-12

        10/11/2012

        12/20/2012

        Smoke, Bronco, and Gray Creeks revises DO and chloride standards

        R129-12

        10/11/2012

        12/20/2012

        Aquatic life toxics standards

        R130-12

        10/11/2012

        12/20/2012

        North Antelope Creek standards

        R131-12

        10/11/2012

        12/20/2012

        Statewide fecal coliform standards

        R132-12

        10/11/2012

        12/20/2012

        Colorado River Salinity Standards

        R093-13

        12/4/2013

        12/23/2013

        Remove NV WQS on Federal Indian Reservations

        R102-14

        10/8/2014

        10/24/2014

        Upper Humboldt Class Waters, Water Quality Standards Revision

        R103-14

        12/3/2014

        12/22/2014

        South Fork Humboldt River and South Fork Reservoir Water Quality Standards Revisions

        R101-14

        2/10/2016

        4/4/2016

        Lahonton Reservoir, Water Quality Standards Revision

        R130-15

        2/10/2016

        4/4/2016

        Lower Humboldt Class Waters, Water Quality Standards Revision

        R102-16

        12/5/2017

        12/19/2017

        Lower Humboldt Class Waters, Water Quality Standards Revision

        R109-16

        12/5/2017

        12/19/2017

        Consistency Petition, Water Quality Standards Revision

        R036-19

        10/2/2019

        10/30/2019

        Cadmium, Water Quality Standards Revision

        R037-19

        10/2/2019

        10/30/2019

        Colorado River, Water Quality Standards Revision

        R043-19

        12/4/2019

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        Selenium, Water Quality Standards Revision

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