Nevada Administrative Code › Chapter 445A - Water Controls › WATER POLLUTION CONTROL › Standards for Water Quality › Section 445A.1906 - Walker Region: Walker River at the Walker River Indian Reservation

Current through June 11, 2024
The limits of this table apply to the body of water known as
				  the Walker River from the confluence of the East Fork of the Walker River and
				  the West Fork of the Walker River to the exterior border of the Walker River
				  Indian Reservation. This segment of the Walker River is located in Lyon
				  County.
STANDARDS OF WATER QUALITY
Walker River at the Walker River Indian Reservation
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 and largemouth bass.
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] 0.26 [LESS THEN OR EQUAL TO]
							 0.40
*
*
X
X
Nitrogen Species (as N) - mg/l
Total Nitrogen
Nitrate S.V. Nitrite S.V.
[LESS THEN OR EQUAL TO] 10 [LESS THEN OR
							 EQUAL TO] 1d
X
*
X
X
*
X
A-Avg. S.V.
[LESS THEN OR EQUAL TO] 1.2 [LESS THEN OR
							 EQUAL TO] 1.5
Total Ammonia (as N) - mg/l
e
*
Suspended Solids - mg/l
S.V.
[LESS THEN OR EQUAL TO] 80
*
Turbidity - NTU
f
*
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] 400 [LESS THEN OR EQUAL TO]
							 450
A-Avg.
[LESS THEN OR EQUAL TO] 500
X
X
*
Chloride - mg/l
A-Avg. S.V.
[LESS THEN OR EQUAL TO] 30 [LESS THEN OR EQUAL TO]
							 35
S.V.
[LESS THEN OR EQUAL TO] 250
X
X
*
X
Sulfate - mg/l
A-Avg. S.V.
[LESS THEN OR EQUAL TO] 95 [LESS THEN OR EQUAL TO]
							 110
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]
							 410
*
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 in the reach from Walker Lake to Weber
				  Reservoir.
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 in the reach from Walker Lake to the Weber
				  Reservoir.
e The ambient water quality
				  criteria for ammonia are specified in NAC 445A.118.
f 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