Nevada Administrative Code › Chapter 445A - Water Controls › WATER POLLUTION CONTROL › Standards for Water Quality › Section 445A.1908 - Walker Region: Walker River at Walker Lake

Current through June 11, 2024
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]pH
6.5 - 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 - NTU
e
*
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.
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