Nevada Administrative Code
Chapter 445A - Water Controls
WATER POLLUTION CONTROL
Standards for Water Quality
Section 445A.2158 - Colorado Region: Las Vegas Wash at Lake Mead

Universal Citation: NV Admin Code 445A.2158
Current through September 16, 2024

The limits of this table apply to the body of water known as the Las Vegas Wash from the Historic Lateral to its confluence with Lake Mead. This segment of the Las Vegas Wash is located in Clark County.

STANDARDS OF WATER QUALITY

Las Vegas Wash at Lake Mead

PARAMETER

REQUIREMENTS TO MAINTAIN EXISTING HIGHER QUALITY

WATER QUALITY CRITERIA TO PROTECT BENEFICIAL USES

Beneficial Usesa
Livestock Irrigation Aquatic Contact Noncontact Municipal Industrial Wildlife Aesthetic Enhance Marsh

Beneficial Uses

X

X

X

X

X

X

Aquatic Life Species of Concern

Warm-water fish.[DAGGER]

Temperature [DELTA]Tb - °C

[DELTA]T = 0

S.V.<=34*

*

pH - SU

S.V. 6.5 - 9.0

*

Dissolved Oxygen - mg/L

S.V.>=5.0 *

*

Total Inorganic Nitrogen (as N) - mg/L

95% of S.V. samples <= 17

*

Nitrate (as N) - mg/L

S.V.<= 90

*

Nitrite (as N) - mg/L

S.V.<= 5

*

Total Suspended Solids -mg/L

S.V.<= 135c

*

Total Dissolved Solids -mg/L

95% of S.V. samples <= 2400

S.V. <= 3000

*

Fecal Coliform - No./100 mL

d

*

E. coli - cfu/100 mL

A.G.M.<= 630

*

Toxic Materials

e

* = The most restrictive beneficial use.

X = Beneficial use.

[DAGGER] Warm-water fish indicates protection of aquatic life warm-water fish, not the establishment of a warm-water fishery.

a Refer to NAC 445A.122 and 445A.2142 for beneficial use terminology.

b Maximum allowable increase in temperature above water temperature at the boundary of an approved mixing zone.

c The total suspended solids standard does not apply when flows are greater than 110 percent of average flow as measured at the nearest gage. "Average flow" is defined as the 12-month rolling average of the average monthly flow.

d Any discharge from a point source into the Las Vegas Wash must not exceed a log mean of 200 per 100 milliliters based on a minimum of not less than five samples taken over a 30-day period, nor may more than 10 percent of the total samples taken during any 30-day period exceed 400 per 100 milliliters.

e The water quality criteria for toxic materials are specified in NAC 445A.1236.

Added to NAC by Environmental Comm'n by R160-06, eff. 8-26-2008; A by R037-19A, eff. 10/22/2019

NRS 445A.425, 445A.520

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