This study monitored natural organic matter (NOM) characteristics of treated water samples in terms of dissolved organic carbon (DOC), UVA254, SUVA, XAD 8/4 resin fractionation, HPSEC-DOC/UV, 3D-fluorescence excitation and emission matrix (EEM). There are a number of underlying hypotheses that relate NOM properties to treatability. First, chlorination disinfection byproducts (DBPs), coagulatability, and ozone reactivity generally correlate with a higher SUVA, the magnitude of the SEC-DOC humic substances peak, the dominance of the EEM humic-like spectral maximum, and a higher HPO fraction. The magnitude of the SEC-DOC polysaccharide peak correlates with membrane fouling while the magnitude of the low MW acids peak inversely correlates with biostability. There is some evidence that haloacetic acid (HAA) precursors are more polar than trihalomethanes (THM) precursors and that lower SUVA and higher TPI and/or HPI fractions are more influential in forming HAAs than THMs. The magnitude of the EEM protein-like spectral maximum can be correlated with nitrogenous DBPs (N-DBPs; e.g., haloacetonitriles (HAAs). While Br- is the primary determinant of bromate (BrO3 -) formation, the character of NOM also plays a role, with higher SUVA (HPO fraction) promoting BrO3 - formation. Includes tables, figures.