Nev. Admin. Code § 445A.1906 - Walker Region: Walker River at the Walker River Indian Reservation

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.

Notes

Nev. Admin. Code § 445A.1906

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