CHAPTER 445A - WATER CONTROLS

NAC 445A.5135 “Unfiltered system” defined. (NRS 445A.860) “Unfiltered system” means a public water system that meets the requirements of NAC 445A.525 and uses disinfection as its sole method of treatment for microbial contamination. (Added to NAC by Environmental Comm’n by R194-0…

NAC 445A.514 “Unit of nephelometric turbidity” defined. (NRS 445A.860) “Unit of nephelometric turbidity” means a measurement of the turbidity of water as determined by the ratio of the intensity of light scattered by the sample to the intensity of incident light, using instrument…

NAC 445A.5145 “Water project” defined. (NRS 445A.855, 445A.860) “Water project” has the meaning ascribed to it in NAC 445A.66585. (Added to NAC by Environmental Comm’n by R133-24, eff. 12-19-2024)

NAC 445A.516 “Watershed” defined. (NRS 445A.860) “Watershed” means the area contained in a basin of drainage or a subbasin of drainage which is tributary to a point of diversion of a supply of water. (Added to NAC by Bd. of Health, eff. 11-29-90)—(Substituted in revision for NAC …

NAC 445A.517 Applicability. (NRS 445A.860) The provisions of NAC 445A.495 to 445A.5405, inclusive, apply to: 1. Any public water system using surface water or groundwater under the direct influence of surface water; and 2. Any supplier of water who owns, controls or operates such…

NAC 445A.518 Submission of plan for compliance with requirements; date for final compliance. (NRS 445A.860) 1. A supplier of water who is notified by the Division or the appropriate district board of health that the public water system is not meeting any of the requirements for t…

NAC 445A.519 Procedure for review of actions taken by Division; appeals. (NRS 445A.860) 1. A person who has reason to believe that an action taken by the Division pursuant to NAC 445A.495 to 445A.5405, inclusive, is incorrect or based on inadequate knowledge may, within 10 busine…

NAC 445A.5195 General requirements for monitoring quality of source water to determine bin classification. (NRS 445A.860) 1. Each supplier of water shall monitor the quality of the source water of the public system to determine the bin classification, in accordance with 40 C.F.R.…

NAC 445A.520 General requirements for treatment. (NRS 445A.860) 1. Except as otherwise provided in this section, each supplier of water shall treat the water in accordance with NAC 445A.521, 445A.526 and 445A.5265, and 40 C.F.R. §§ 141.70, 141.76, 141.170, 141.500 to 141.503, inc…

NAC 445A.521 Filtration: Methods of treatment. (NRS 445A.860) 1. Each supplier of water shall treat the water in accordance with 40 C.F.R. §§ 141.73, 141.173, 141.550 to 141.553, inclusive, and 141.711, as adopted by reference in NAC 445A.4525. 2. The Commission will not grant a …

NAC 445A.522 Filtration: Efficiencies for removal. (NRS 445A.860) 1. For the purposes of meeting the levels of treatment set forth in NAC 445A.520: (a) Conventional filtration treatment is presumed to be capable of achieving at least 99.9 percent or 3-log removal of Cryptosporidi…

NAC 445A.524 Filtration: Use of alternative technology. (NRS 445A.860) 1. The use of an alternative filtration technology, including packaged treatment plants, may be approved by the Division or the appropriate district board of health if the following requirements are met: (a) T…

NAC 445A.525 Filtration: Avoidance of requirements. (NRS 445A.860) 1. A supplier of water may apply to the Division to operate without installing a system for filtration. The Division may grant the request if the supplier of water, not later than December 30, 1991, or 18 months a…

NAC 445A.526 Standards for disinfection. (NRS 445A.860) 1. Each supplier of water shall provide disinfection treatment in accordance with 40 C.F.R. § 141.72, as adopted by reference in NAC 445A.4525, and the applicable inactivation components of the microbial toolbox pursuant to …

NAC 445A.5265 Requirements for treatment of Cryptosporidium. (NRS 445A.860) 1. A supplier of water who is required to meet the requirements for treatment of Cryptosporidium contamination pursuant to subsection 4 of NAC 445A.5195 shall implement the requirements of the applicable …

NAC 445A.527 Requirements for monitoring. (NRS 445A.860) 1. Except as otherwise provided in this section, each supplier of water shall, on or after June 29, 1993, or on the date the system for filtration is installed, whichever is later, meet the requirements set forth in 40 C.F.…

NAC 445A.529 Submission of engineering report for system of treatment installed before November 29, 1990. (NRS 445A.860) A supplier of water that has installed a system for treatment before November 29, 1990, which does not consist of technologies pursuant to which the supplier o…

NAC 445A.530 Submission and approval of engineering report before construction or modification of facility; standards for design. (NRS 445A.860) 1. A supplier of water proposing to: (a) Construct a new facility for filtration and disinfection; or (b) Make additions to or modify s…

NAC 445A.531 Inclusion of features for reliability in design and construction of plant. (NRS 445A.860) The following features for reliability or alternatives acceptable to the Division or the appropriate district board of health must be included in the design and construction of …

NAC 445A.5315 Comprehensive performance evaluations; comprehensive technical assistance. (NRS 445A.860) 1. A comprehensive performance evaluation must emphasize approaches that can be implemented without significant capital improvements and must consist of the following component…

NAC 445A.532 Certification of persons operating facility. (NRS 445A.860, 445A.880) A supplier of water shall, not later than 6 months after receiving notification from the Division that its public water system is using surface water or groundwater under the direct influence of su…

NAC 445A.533 Standards for operation of facility for filtration. (NRS 445A.860) A facility for filtration must be operated in accordance with the following requirements: 1. A plant for conventional and direct filtration must be operated at a rate of flow not to exceed 3 gallons p…

NAC 445A.5335 Composite correction program. (NRS 445A.860) 1. A composite correction program required pursuant to NAC 445A.533 must be performed by a person approved by the Division or the appropriate district board of health. 2. Each supplier of water required to perform a compo…

NAC 445A.534 Equipment of facility for disinfection. (NRS 445A.860) A facility for disinfection must be equipped with: 1. A reserve supply of chemicals. 2. An emergency plan to be put into effect if there is a failure in the disinfectant process. The object of the plan must be to…

NAC 445A.535 Requirements for plan of operations. (NRS 445A.860) 1. A supplier of water shall submit a plan of operations for each facility that treats surface water or groundwater under the direct influence of surface water to the Division or the appropriate district board of he…

NAC 445A.536 Maintenance of records. (NRS 445A.860) 1. Each supplier of water shall maintain accurate and complete records of the operation of each treatment plant using surface water or groundwater under the direct influence of surface water. The records must include: (a) The re…

NAC 445A.537 Submission of monthly reports and other reporting actions. (NRS 445A.860) 1. Each supplier of water shall submit to the Division or the appropriate district board of health, on or after June 29, 1993, or on the date the system for filtration is installed, whichever i…

NAC 445A.538 Notification of certain events. (NRS 445A.860) Each supplier of water shall: 1. Consult with the Division or the appropriate district board of health and provide public notification for a violation of a treatment technique requirement resulting from a single exceedan…

NAC 445A.539 Periodic performance of sanitary survey of watershed; report of survey. (NRS 445A.860) 1. Unless an alternate frequency is otherwise required to maintain a watershed control program to meet the requirements for filtration avoidance pursuant to NAC 445A.525 or the req…

NAC 445A.540 Requirements for notification of persons served by system. (NRS 445A.860) 1. A supplier of water shall notify persons served by the public water system: (a) If he or she has not installed a system for filtration by June 29, 1993, and has not met the requirements of N…

NAC 445A.54022 Applicability. (NRS 445A.860) The provisions of NAC 445A.54022 to 445A.5405, inclusive, apply to any public water system that uses a source of groundwater that must be treated to remove or blend a constituent that exceeds primary drinking water maximum contaminant …

NAC 445A.54024 Prerequisites to commencement of project. (NRS 445A.860) A public water system which relies on a source of groundwater must, before commencing a water project to treat or blend groundwater: 1. Except as otherwise provided in subsection 3 of NAC 445A.54026, submit t…

NAC 445A.54026 Submission and review of preliminary engineering report before construction or modification of facility. (NRS 445A.860) 1. Except as otherwise provided in subsection 3, a public water system proposing to: (a) Construct a new facility for treatment or blending of gr…

NAC 445A.54028 Application for approval of facility. (NRS 445A.860) An application for approval of a water project to treat or blend groundwater must contain: 1. Complete plans for the treatment or blending facility, including, without limitation, the details of any improvements …

NAC 445A.5403 Approval of project: Prerequisites; effective period; extension; revocation. (NRS 445A.860) 1. The Division or the appropriate district board of health shall not approve a project for a facility to treat groundwater unless the application for approval of the water p…

NAC 445A.54032 Preparation by engineer of plans, specifications and design reports for facility. (NRS 445A.860) In accordance with the provisions of NAC 625.610 to 625.613, inclusive: 1. All initial and final plans, specifications and design reports for a facility to treat ground…

NAC 445A.54034 Design of facility to be based upon pilot plant study; approval of treatment technology without pilot study. (NRS 445A.860) 1. Except as otherwise provided in subsection 2, the design of a groundwater treatment facility must be based upon a pilot plant study. The p…

NAC 445A.54036 Requirements for design of new facility. (NRS 445A.860) 1. The design for a new facility to treat groundwater must: (a) Be free of structural and sanitary hazards. (b) Provide for protection against pollution and contamination by backflow. (c) Provide equipment for…

NAC 445A.54038 Inclusion of features for reliability in design and construction of facility. (NRS 445A.860) The following features for reliability or alternatives acceptable to the Division or the appropriate district board of health must be included in the design and constructio…

NAC 445A.5404 Equipment of facility for disinfection. (NRS 445A.860) A facility for disinfection of groundwater must be equipped with: 1. A reserve supply of chemicals and backup available parts for the equipment; and 2. An emergency plan to be put into effect if there is a failu…

NAC 445A.54042 Standards for disinfection. (NRS 445A.860) Each public water system to which the disinfection requirements of 40 C.F.R. § 141.403, as adopted by reference in NAC 445A.4525, and NAC 445A.66825 apply shall provide disinfection treatment in accordance with the provisi…

NAC 445A.54044 Certification of persons operating facility. (NRS 445A.860, 445A.880) A public water system shall, not later than 6 months after receiving notification from the Division or the appropriate district board of health that it is operating a facility to treat groundwate…

NAC 445A.54046 Requirements for plan of operations. (NRS 445A.860) 1. A public water system shall submit a plan of operations for each facility that treats groundwater to the Division or the appropriate district board of health for review and approval. The plan must be designed t…

NAC 445A.54048 Maintenance of records. (NRS 445A.860) 1. Each public water system shall maintain accurate and complete records of the operation of each facility to treat groundwater. The records must include: (a) The results of all monitoring conducted in accordance with NAC 445A…

NAC 445A.5405 Submission of sampling logs. (NRS 445A.855, 445A.860) A public water system operating a facility to treat or blend groundwater shall submit a sampling log every 3 months to the Division or the appropriate district board of health that verifies the facility is proper…

NAC 445A.542 Definitions. (NRS 445A.860, 445A.863) As used in NAC 445A.542 to 445A.54296, inclusive, unless the context otherwise requires, the words and terms defined in NAC 445A.5421 to 445A.5425, inclusive, have the meanings ascribed to them in those sections. (Added to NAC by…

NAC 445A.5421 “Accuracy” defined. (NRS 445A.860, 445A.863) “Accuracy” has the meaning ascribed to it in Appendix B of chapter 5 of the Standards. (Added to NAC by Bd. of Health by R203-99, eff. 8-1-2001)