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

2019 Petitions

Public Notice and Agenda for Workshops

P2019-01 Colorado Standards Review: The last review of the Colorado River / Lake Mead water quality standards was in 1998. NDEP is required to periodically review standards and update as appropriate. The NDEP is proposing to add warm-water fish criteria to the Las Vegas Wash, define Lake Mohave as its own reach, and add the Lake at Las Vegas as a reach to the NAC. Also, certain water quality standards are being updated to align with the current EPA criteria.

P2019-02 Selenium Petition: Nevada’s current aquatic-life criteria for selenium are based on EPA’s 1987 selenium criteria for aquatic life, so the NDEP is proposing to adopt EPA’s 2016 criterion, with modification. This petition will update numeric criteria in NAC 445A.1236, the “toxics table” and add NAC 445A.1237 describing the updated complex criterion for selenium. NDEP recalculated the criterion values to reflect the absence of sturgeon in Nevada by applying EPA’s recalculation procedure (EPA 2013) to the toxicity test data presented in EPA’s 2016 criteria document.

P2019-03 Cadmium Petition: The NDEP is proposing to amend NAC 445A.11704 – 445A.2234, Standards for Water Quality, to align with the most-current numeric criteria recommended and published by the EPA for cadmium to protect aquatic life from acute and chronic exposures to dissolved cadmium. The 2016 update published by EPA made minor changes to the formula used to calculate cadmium criteria concentrations over a range of concentrations of total hardness.

Temperature Water Quality Standards Review - The Bureau of Water Quality Planning of the Nevada Division of Environmental Protection (NDEP) has embarked on an effort to review and update our temperature water quality standards for the protection of aquatic life in Nevada waters. Nevada’s current temperature criteria are not well documented and we need scientifically supported guidance as NDEP reviews temperature standards throughout the state. 

Truckee River WQ Standards Review - The Bureau of Water Quality Planning of the Nevada Division of Environmental Protection (NDEP) has begun a review of the Truckee River water quality standards contained in Nevada Administrative Code 445A.1682 through 445A.1694.

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

Lower Humboldt Class Waters, Water Quality Standards Revision

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