Previously studied reactions of the formation of ion associates between polyallyldimethylammonium chloride (PADAC) and triphenylmethane dyes were used in the determination of the residual concentration of polymeric flocculants. Rapid procedures were developed for analyzing hydrochemical objects of different types without the separation of PADAC and the effect of interferents was taken into account. The analysis of process solutions of water treatment was performed using the reaction with Xylenol Orange; the analysis of potable water and purified sewage waters was based on the reaction with Erythrosine. The precision of the procedures is at a level of RSD ≤ 20%. The systematic error does not exceed the tolerable level if the concentrations of metals and surfactants in the studied water are lower than their maximum permissible concentrations.