Nev. Admin. Code § 445A.2164
The limits of this table apply to the body of water known as the Virgin River from the Arizona-Nevada state line to Mesquite. This segment of the Virgin River is located in Clark County.
STANDARDS OF WATER QUALITY
Virgin River at Mesquite
| 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. [DELTA]pH | 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] 0.9 [LESS THEN OR EQUAL TO] 1.6 | |||||||||||||||
| 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] 300 [LESS THEN OR EQUAL TO] 550 | 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.2164
NRS 445A.425, 445A.520