This publication documents: (a) the dissolved air flotation and filtration (DAFF) process; (b) the Drinking Water Standards and water quality goals; (c) standards for raw water sources; (d) the procedure for determination of the trihalomethane maximum formation potential (THMMFP), (e) the alternatives of treating an unpredictable water supply source, (f) the filter backwash wastewater recycle and total chemical sludge recycle technology, (g) the glossary of drinking water quality parameters, and (h) a 4-months DAFF research for treatment of an unpredictable water supply source. The raw water had wide ranges of color (25-90 CU), humic substances (1.5-9.6 mg/l), turbidity (1.08-14.2 NTU), coliform bacteria (1 to TNTC #/100 ml), THMMFP (127 to 683 ppb), UV absorbance (0.13 to 0.28 UV), cysts-size microscopic count (410 to 34623 #/ml), chlorine demand (2 to 2.5 mg/l), lead (0.038 mg/l), and pH (6.4-7.5 units). Under the government supervision, a continuous DAFF plant was operated at 100 gpm flow for treating the above raw water using alum, sodium aluminate, and polymer for 4 months. The DAFF effluent met the all drinking water standards, and the plant performance in terms of impurity percent removals was excellent: color (93%), humic substances (80%), turbidity (93%), coliform bacteria (99%), THMMFP (82%), UV Absorbance (86%), cyst-size microscopic count (99.6%), chlorine demand (52%), and lead (43%). Any manufacturer’s dissolved air flotation (DAF) and filtration process equipment (such as AquaDAF, Clari-DAF, etc.) may achieve similar high performance for water purification. https://hcommons-staging.org/deposits/item/hc:55689/