Nevada Administrative Code

NAC 445A.11704 Definitions. (NRS 445A.425, 445A.520) As used in NAC 445A.11704 to 445A.2234, inclusive, unless the context otherwise requires, the terms and symbols defined in NAC 445A.11708 to 445A.1178, inclusive, have the meanings ascribed to them in those sections. (Added to …

NAC 445A.11708 “A-Avg.” or “A.A.” defined. (NRS 445A.425, 445A.520) “A-Avg.” or “A.A.” means annual average. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.129)

NAC 445A.11709 “BOD” or “biochemical oxygen demand” defined. (NRS 445A.425, 445A.520) “BOD” or “biochemical oxygen demand” means a measure of the amount of oxygen that bacteria will consume while decomposing organic matter under aerobic conditions. (Added to NAC by Environmental …

NAC 445A.11711 “cfu/100 mL” defined. (NRS 445A.425, 445A.520) “cfu/100 mL” means the number of colony-forming units of bacteria present in 100 milliliters of water. (Added to NAC by Environmental Comm’n by R102-16, eff. 12-19-2017)

NAC 445A.11712 “Δ” defined. (NRS 445A.425, 445A.520) “Δ” means the difference between two points. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.130)

NAC 445A.11716 “Δ pH” defined. (NRS 445A.425, 445A.520) “Δ pH” means the change in pH. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.131)

NAC 445A.1172 “Δ T” defined. (NRS 445A.425, 445A.520) “Δ T” means the change in temperature. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.132)

NAC 445A.11724 “Geometric mean” or “G.M.” defined. (NRS 445A.425, 445A.520) “Geometric mean” or “G.M.” means the mean of n positive numbers obtained by taking the nth root of the product of the numbers. (Added to NAC by Environmental Comm’n, eff. 6-29-84; A by R102-16, 12-19-2017…

NAC 445A.1173 “Logarithmic mean” or “log mean” defined. (NRS 445A.425, 445A.520) “Logarithmic mean” or “log mean” means a value calculated by: 1. Converting each data point into its log; 2. Calculating the mean of the values determined pursuant to subsection 1; and 3. Using the a…

NAC 445A.11736 “M.D.B. & M.” defined. (NRS 445A.425, 445A.520) “M.D.B. & M.” means Mount Diablo Base and Meridian. (Added to NAC by Environmental Comm’n by R226-03, eff. 4-23-2004)

NAC 445A.11737 “Mean” defined. (NRS 445A.425, 445A.520) “Mean” means the average of a group of numbers or data points. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.11738 “Median” defined. (NRS 445A.425, 445A.520) “Median” means the 50th percentile of a set of numbers. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.11739 “MF” defined. (NRS 445A.425, 445A.520) “MF” means the membrane filter used to measure bacteria. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.1174 “mg/L” defined. (NRS 445A.425, 445A.520) “mg/L” means the concentration of a substance, in milligrams, present in one liter of the water. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.134)

NAC 445A.11742 “MPN/100 mL” defined. (NRS 445A.425, 445A.520) “MPN/100 mL” means the most probable number determined using a statistical testing method to estimate the number of bacteria or other organisms present in 100 milliliters of water. (Added to NAC by Environmental Comm’n…

NAC 445A.11744 “No./100mL” defined. (NRS 445A.425, 445A.520) “No./100mL” means the number of organisms present in 100 milliliters of the water. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.135)

NAC 445A.11748 “NTU” defined. (NRS 445A.425, 445A.520) “NTU” means nephelometric turbidity units, a measure of turbidity. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.136)

NAC 445A.11752 “PCU” defined. (NRS 445A.425, 445A.520) “PCU” means platinum cobalt unit, a measure of color. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.137)

NAC 445A.1176 “SAR” defined. (NRS 445A.425, 445A.520) “SAR” means sodium adsorption ratio. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.139)

NAC 445A.11764 “SU” defined. (NRS 445A.425, 445A.520) “SU” means standard pH units. (Added to NAC by Environmental Comm’n by R226-03, eff. 4-23-2004)

NAC 445A.11768 “S.V.” defined. (NRS 445A.425, 445A.520) “S.V.” means single value. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.140)

NAC 445A.11772 “Trout water” defined. (NRS 445A.425, 445A.520) “Trout water” means a reach of water that the Commission determines is suitable as a habitat for trout. (Added to NAC by Environmental Comm’n by R226-03, eff. 4-23-2004)

NAC 445A.11773 “μg/L” defined. (NRS 445A.425, 445A.520) “μg/L” means a unit of concentration describing the mass of a substance, in micrograms, present in one liter of water. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.11774 “>” defined. (NRS 445A.425, 445A.520) “>” means greater than. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.11775 “<” defined. (NRS 445A.425, 445A.520) “<” means less than. (Added to NAC by Environmental Comm’n by R109-16, eff. 12-19-2017)

NAC 445A.11776 “≥” defined. (NRS 445A.425, 445A.520) “≥” means greater than or equal to. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.141)

NAC 445A.1178 “≤” defined. (NRS 445A.425, 445A.520) “≤” means less than or equal to. (Added to NAC by Environmental Comm’n, eff. 6-29-84)—(Substituted in revision for NAC 445A.142)

NAC 445A.118 Water quality criteria for total ammonia. (NRS 445A.425, 445A.520) 1. The acute criteria of water quality with regard to the concentration of total ammonia are subject to the following: (a) The 1-hour average concentration of total ammonia, in milligrams of nitrogen …

NAC 445A.1195 Determination of E. coli bacteria. (NRS 445A.425, 445A.520) The number of E. coli bacteria present in a sample of water may be determined and reported: 1. By counting the colony-forming units in the sample; or 2. Through the use of a statistical testing method to de…

NAC 445A.120 Applicability. (NRS 445A.425, 445A.520) 1. NAC 445A.070 to 445A.2234, inclusive, apply to all natural streams and lakes, reservoirs or impoundments on natural streams and other specified waterways, unless excepted on the basis of existing irreparable conditions which…

NAC 445A.121 Standards applicable to all surface waters. (NRS 445A.425, 445A.520) The following standards are applicable to all surface waters of the State: 1. Waters must be free from substances attributable to domestic or industrial waste or other controllable sources that will…

NAC 445A.122 Standards applicable to beneficial uses. (NRS 445A.425, 445A.520) 1. The following standards are intended to protect both existing and designated beneficial uses and must not be used to prohibit the use of the water as authorized under title 48 of NRS: (a) Watering o…

NAC 445A.1225 Designation of beneficial use of “extraordinary ecological, aesthetic or recreational value.” (NRS 445A.425, 445A.520) 1. For the purposes of paragraph (i) of subsection 1 of NAC 445A.122, the Commission may designate a surface water or segment of a surface water wi…

NAC 445A.123 Classification and reclassification of waters. (NRS 445A.425, 445A.520) 1. Stream standards and classifications in NAC 445A.123 to 445A.2234, inclusive, do not preclude the Commission from establishing standards and classifications for additional public waters nor re…

NAC 445A.1233 Cooperation regarding Colorado River; salinity standards. (NRS 445A.425, 445A.520) 1. The State of Nevada will cooperate with the other Colorado River Basin states and the Federal Government to support and carry out the conclusions and recommendations adopted April …

NAC 445A.1236 Standards for toxic materials applicable to designated waters. (NRS 445A.425, 445A.520) 1. Except for waters which have site-specific standards for toxic materials or as otherwise provided in this section, the standards for toxic materials prescribed in subsection 2…

NAC 445A.1237 Standards for selenium for support of aquatic life applicable to designated waters. (NRS 445A.425, 445A.520) 1. Except as otherwise provided in subsection 8, the standards for selenium prescribed in this section for the support of aquatic life are applicable to the …

NAC 445A.1239 Control points: Prescription and applicability of numerical standards for water quality; designation of beneficial uses. (NRS 445A.425, 445A.520) 1. Control points are locations where water quality criteria are specified. Criteria so specified apply to all surface w…

NAC 445A.1242 Hydrographic regions. (NRS 445A.425, 445A.520) The designated beneficial uses and water quality standards for select bodies of water within the 14 hydrographic regions of Nevada, as established by the Division of Water Resources of the Department and the United Stat…

NAC 445A.1252 Northwest Region: Designated beneficial uses. (NRS 445A.425, 445A.520) The designated beneficial uses for select bodies of water within the Northwest Region are prescribed in this section: Water Body Name Segment Description Beneficial Uses Aquatic Life Species of C…

NAC 445A.1254 Northwest Region: Standards for select bodies of water. (NRS 445A.425, 445A.520) The standards for water quality for select bodies of water within the Northwest Region are prescribed in NAC 445A.1254 to 445A.1268, inclusive. (Added to NAC by Environmental Comm’n by …

NAC 445A.1256 Northwest Region: Boulder Reservoir. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Boulder Reservoir. Boulder Reservoir is located in Washoe County. STANDARDS OF WATER QUALITY Boulder Reservoir PARAMETER REQUIREMENTS TO…

NAC 445A.1258 Northwest Region: Blue Lakes. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Blue Lakes. Blue Lakes is located in Humboldt County. STANDARDS OF WATER QUALITY Blue Lakes PARAMETER REQUIREMENTS TO MAINTAIN EXISTING HIGHER …

NAC 445A.1262 Northwest Region: Catnip Reservoir. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Catnip Reservoir. Catnip Reservoir is located in Washoe County. STANDARDS OF WATER QUALITY Catnip Reservoir PARAMETER REQUIREMENTS TO MAI…

NAC 445A.1264 Northwest Region: Wall Canyon Reservoir. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Wall Canyon Reservoir. Wall Canyon Reservoir is located in Washoe County. STANDARDS OF WATER QUALITY Wall Canyon Reservoir PARAMETER…

NAC 445A.1266 Northwest Region: Knott Creek Reservoir. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Knott Creek Reservoir. Knott Creek Reservoir is located in Humboldt County. STANDARDS OF WATER QUALITY Knott Creek Reservoir PARAMET…

NAC 445A.1268 Northwest Region: Onion Valley Reservoir. (NRS 445A.425, 445A.520) The limits of this table apply to the entire body of water known as Onion Valley Reservoir. Onion Valley Reservoir is located in Humboldt County. STANDARDS OF WATER QUALITY Onion Valley Reservoir PAR…