Nev. Admin. Code § 445A.2166
The limits of this table apply to the body of water known as the Virgin River from Mesquite to the river mouth at Lake Mead. This segment of the Virgin River is located in Clark County.
STANDARDS OF WATER QUALITY
Virgin River at Lake Mead
| 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 | ||||||||||
| Aquatic Life Species of Concern | ||||||||||||||||
| Temperature - °C [DELTA]Tb - °C | DT | = 0 | S.V. Nov-Jun S.V. Jul-Oct DT | [LESS THEN OR EQUAL TO] 21 [LESS THEN OR EQUAL TO] 32 [LESS THEN OR EQUAL TO] 2 | * | |||||||||||
| pH - SU | S.V. DpH | 6.5 - 9.0 ± 0.5 | X | X | * | X | X | * | ||||||||
| Dissolved Oxygen - mg/l | S.V. | [GREATER THEN OR EQUAL TO] 5.0 | X | * | X | X | ||||||||||
| Total Phosphates (as P) - mg/l | A-Avg. | [LESS THEN OR EQUAL TO] 0.1 | * | X | ||||||||||||
| Nitrogen Species (as N) - mg/l | Total Nitrogen | Nitrate S.V. Nitrite S.V. | [LESS THEN OR EQUAL TO] 90 [LESS THEN OR EQUAL TO] 5.0 | X | * | X | X | |||||||||
| A-Avg. S.V. | [LESS THEN OR EQUAL TO] 2.9 [LESS THEN OR EQUAL TO] 6.1 | |||||||||||||||
| Total Ammonia (as N) - mg/l | c | * | ||||||||||||||
| Turbidity - NTU | d | * | ||||||||||||||
| Color - PCU | e | * | ||||||||||||||
| Total Dissolved Solids - mg/l | f | X | * | |||||||||||||
| Alkalinity (as CaCO3) - mg/l | 25% change from natural conditions | * | X | |||||||||||||
| E. coli - No./100 ml | A.G.M. | [LESS THEN OR EQUAL TO] 630 | * | |||||||||||||
| Fecal Coliform - No./100 ml | A.G.M. S.V. | [LESS THEN OR EQUAL TO] 625 [LESS THEN OR EQUAL TO] 1250 | S.V. | [LESS THEN OR EQUAL TO] 1,000 | X | * | X | X | ||||||||
* = The most restrictive beneficial use.
X = Beneficial use.
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, but the increase must not cause a violation of the single value standard.
c The ambient water quality criteria for ammonia are specified in NAC 445A.118.
d Increase in turbidity must not be more than 10 NTU above natural conditions.
e Increase in color must not be more than 10 PCU above natural conditions.
f The salinity standard for the Colorado River System is specified in NAC 445A.1233.
Nev. Admin. Code § 445A.2166
NRS 445A.425, 445A.520