NAC445A.9662. Nitrogen removal wastewater treatment unit.

     1. If the Division or other administrative authority determines that the degradation of groundwater or the constraints of the site of the on-site sewage disposal system require effluent which is of a higher quality than that which would be provided by a septic tank, the Division or other administrative authority may require that the on-site sewage disposal system include a nitrogen removal wastewater treatment unit.

     2. A detailed hydrogeological study must be submitted by the design engineer which demonstrates that a nitrogen removal wastewater treatment unit will not increase the total nitrogen concentration to more than 5 milligrams per liter in the groundwater beneath the site or at any down-gradient location.

     3. A nitrogen removal wastewater treatment unit that produces effluent with a total nitrogen concentration of 20 milligrams per liter or more may not be approved by the Division or other administrative agency for use in areas where it has been documented that the total nitrogen concentration of the groundwater is 10 milligrams per liter or more.

     4. The owner of an on-site sewage disposal system that will include a nitrogen removal wastewater treatment unit must include in the design specifications pursuant to NAC 445A.9614 a manual for the operation and maintenance of the nitrogen removal wastewater treatment unit.

     5. The owner of an on-site sewage disposal system that will include a nitrogen removal wastewater treatment unit must include in the design specifications submitted pursuant to NAC 445A.9614 a maintenance agreement with a service provider that covers the anticipated life span of the on-site sewage disposal system. The maintenance agreement must include, without limitation, provisions for an annual inspection of the system and its components which verifies that the system is:

     (a) Operating correctly; and

     (b) Producing effluent which has total nitrogen concentrations of 20 milligrams or less per liter.

     6. The design plans for a nitrogen removal wastewater treatment unit must include a schematic detailing a 24-hour alarm system for monitoring the operation of the nitrogen removal wastewater treatment unit.

     7. Except in those cases where a nitrogen wastewater treatment unit is required, a nitrogen removal wastewater treatment unit is not allowed in areas where electrical service is unreliable, dependable maintenance is not available or intermittent use of the nitrogen removal wastewater treatment unit adversely affects the operation of the on-site sewage disposal system.

     8. The Division or other administrative authority may authorize a reduction in the size of the effluent absorption area for an on-site sewage disposal system if a nitrogen removal wastewater treatment unit is used. Any reduction in the size of the effluent absorption area must be justified by the design engineer based on the conditions of the soil and the site.

     (Added to NAC by Environmental Comm’n by R194-07, eff. 8-26-2008)