"Septic tank" means a watertight covered receptacle designed and constructed to receive wastewater from a building sewer, attenuate flows, store digested solids through a period of detention to allow settleable and floating solids to separate from liquids, allow digestion of organic matter by anaerobic bacteria, and allow the clarified liquid to discharge for additional treatment and final dispersal to a soil absorption system.
124 Neb. Admin. Code, ch. 1, § 078