Section 445A.289 - Plants for sewage treatment: Schedule for classification1. For the purpose of the certification program operated pursuant to the provisions of NAC 445A.2855 to 445A.293, inclusive, and except as otherwise provided in subsection 2, a plant for sewage treatment must be classified in accordance with the following schedule: Treatment Process | Plant Classification |
Stabilization Ponds, Facultative Ponds or Lagoons | I |
Primary Treatment (settling, grit removal, etc.) |
Fixed Film Treatment (e.g., trickling filters, etc.) for BOD Removal | II |
Activated Sludge (without nitrogen removal and <20,000 gallons per day) |
Solids Treatment (thickening/dewatering) |
Fixed Film Treatment (e.g., trickling filters) for Nutrient Removal | III |
Activated Sludge (with nitrogen removal or >20,000 gallons per day) |
Tertiary Treatment | IV |
Activated Sludge (>10 million gallons per day) |
Indirect Potable Reuse |
2. The Division may deviate from this table if it determines that mitigating or intensifying factors exist to raise or lower a plant classification. Factors may include, without limitation, receiving stream water quality, process complexity, waste stream pollutant strength or variations and flow variability.3. As used in this section:(a) "BOD" means biochemical oxygen demand.(b) "Tertiary treatment" means the process of treating wastewater beyond secondary treatment units for nutrient removal or other advanced removal methods, including, without limitation, membrane filtration.Nev. Admin. Code § 445A.289
Added to NAC by Environmental Comm'n, eff. 5-27-92; A by R037-02, 10-18-2002; A by R155-17A, eff. 5/16/2018; A by R121-19A, eff. 8/26/2020