Statutes, codes, and regulations
Nevada Administrative Code
Chapter 445A - Water ControlsWATER POLLUTION CONTROL
Standards for Water Quality
Section 445A.1908 - Walker Region: Walker River at Walker Lake

Nev. Admin. Code § 445A.1908

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Current through November 8, 2024
Section 445A.1908 - Walker Region: Walker River at Walker Lake

The limits of this table apply to the Walker River from the exterior border of the Walker River Indian Reservation to Walker Lake. This segment of the Walker River is located in Mineral County.

STANDARDS OF WATER QUALITY

Walker River at Walker Lake

PARAMETER REQUIREMENTS TO MAINTAIN EXISTING HIGHER QUALITY WATER QUALITY STANDARDS FOR BENEFICIAL USES Beneficial Usea
Livestock Irrigation Aquatic Contact Noncontact Municipal Industrial Wildlife Aesthetic Enhance Marsh
Beneficial Uses X X X X X X X X
Aquatic Life Species of Concern Channel catfish, largemouth bass and, from February through June when an adequate flow exists, adult Lahontan cutthroat trout and adult rainbow trout.
Temperature - °C [DELTA]Tb - °C DT = 0 S.V. Nov-Mar S.V. Apr-Jun S.V. Jul-Oct DT [LESS THEN OR EQUAL TO] 13 [LESS THEN OR EQUAL TO] 23c [LESS THEN OR EQUAL TO] 28 [LESS THEN OR EQUAL TO] 2 * X
pH - SU S.V. [DELTA]pH6.5 - 9.0 ± 0.5 X X * * X X X
Dissolved Oxygen - mg/l S.V. Nov-May S.V. Jun-Oct [GREATER THEN OR EQUAL TO] 6.0 [GREATER THEN OR EQUAL TO] 5.0 X * X X X X
Total Phosphates (as P) - mg/l A-Avg. S.V. [LESS THEN OR EQUAL TO] 0.17 [LESS THEN OR EQUAL TO] 0.23 * * X X
Nitrogen Species (as N) - mg/l Total Nitrogen Nitrate S.V. Nitrite S.V. Ammonia (un-ionized) [LESS THEN OR EQUAL TO] 10 [LESS THEN OR EQUAL TO] 1.0d [LESS THEN OR EQUAL TO] 0.06 X * X X * X
A-Avg. S.V. [LESS THEN OR EQUAL TO] 1.2 [LESS THEN OR EQUAL TO] 1.5
Suspended Solids - mg/l S.V. [LESS THEN OR EQUAL TO] 60 S.V. [LESS THEN OR EQUAL TO] 80 *
Turbidity - NTUe * X
Color - PCU S.V. [LESS THEN OR EQUAL TO] 75 X *
Total Dissolved Solids - mg/l A-Avg. S.V. [LESS THEN OR EQUAL TO] 390 [LESS THEN OR EQUAL TO] 570 A-Avg. [LESS THEN OR EQUAL TO] 500 X X *
Chloride - mg/l A-Avg. S.V. [LESS THEN OR EQUAL TO] 23 [LESS THEN OR EQUAL TO] 34 S.V. [LESS THEN OR EQUAL TO] 250 X X * X
Sulfate - mg/l S.V. [LESS THEN OR EQUAL TO] 250 *
Sodium - SAR S.V. [LESS THEN OR EQUAL TO] 3 A-Avg. [LESS THEN OR EQUAL TO] 8 * X
Alkalinity (as CaCO3) - mg/l 25% change from natural conditions * X
E. coli - No./100 ml A.G.M. S.V. [LESS THEN OR EQUAL TO] 126 [LESS THEN OR EQUAL TO] 235 * X

* = The most restrictive beneficial use.

X = Beneficial use.

a Refer to NAC 445A.122 and 445A.1882 for beneficial use terminology.

b Maximum allowable increase in temperature above water temperature at the boundary of an approved mixing zone, but the increase must not cause a violation of the single value standard.

c The temperature beneficial use standard is [LESS THEN OR EQUAL TO] 21°C from February through June when Lahontan cutthroat trout are present.

d The nitrite beneficial use standard is [LESS THEN OR EQUAL TO] 0.06 mg/l from February through June when Lahontan cutthroat trout are present.

e Increase in turbidity must not be more than 10 NTU above natural conditions.

Nev. Admin. Code § 445A.1908

Added to NAC by Environmental Comm'n by R160-06, eff. 8-26-2008; A by R093-13, 12-23-2013

NRS 445A.425, 445A.520