To provide a technique developed to eliminate at least at ordinary temperature, problems indicated in a cementitious or water glass type cementing material in prior art and expressed by keywords such as hexavalent chromium leaching, high alkalinity of a pH of 12 or higher; deficient pot life; non-water resistance, reduction in supply cost; hazards from water leaching of a group of contamitant harmful elements, and energy load.

Provided are a basal water-containing composition prepared by adding a reactive powder composition containing calcia to a binding liquid composition comprising a stable modified alkali silicate having oxy acid ions of one or more elements selected from sulfur, phosphorus, carbon, and boron and homogeneously mixing them; a utilization and treatment method comprising utilizing the basal water-containing composition as a base constituent; and a non-polluting water-resistant treated object subjected to treatment by utilizing the basal water-containing composition as a base utilization treatment agent.