Section 11-25-11 - Classification of water treatment plants The classification of WTPs ascends with the complexity of treatment processes used. Class 1 plants are the simplest to operate and Class 4 plants the most difficult.
(1) Class 1, WTPs use the following technologies:(A) Slow sand filtration;(B) Chemical addition, such as for chlorination, fluoridation, pH control or corrosion control;(C) Granular activated carbon filtration; or(D) Packed aeration towers or air stripping towers.(2) Class 2 WTPs use the following technologies:(B) Cartridge filtration; or(C) Desalting (including distillation, electrodialysis, and reverse osmosis).(3) Class 3 WTPs use the following technologies:(A) Diatomaceous earth filtration; or(B) Package WTPs with features similar to those of diatomaceous earth filtration.(4) Class 4 WTPs use the following technologies:(A) Conventional treatment (coagulation with rapid mixing, flocculation, sedimentation, and filtration);(B) Direct filtration (conventional treatment without sedimentation); or(C) Package WTPs with features similar to those of conventional treatment or direct filtration plants. [Eff 2/8/93; am and comp 4/29/95; am and comp 8/25/97; am and comp 1/8/01; am and comp 5/24/02] (Auth: HRS §§ 340F-7(1), 340F-11(1)) (Imp: HRS §§ 340F-2, 340F-3, 340F-6, 340F-7, 340F-8, 340F-11; 40 C.F.R. §141.70; 42 U.S.C. § 300g - 8)