In the middle taiga of Western Siberia, soil salinization due to spills of highly mineralized formation waters creates long-term environmental risks and costs for subsoil users. The paper estimates the economic efficiency of a three-stage reclamation (drainage → gypsum application → phytoremediation with native salt-tolerant species) in a local area of technogenic salinization (Khanty-Mansiysk Autonomous Okrug, 0.6 ha). The discounted cash flow approach is used to compare the costs of restoration with the environmental damage prevented according to the current methodology. It is shown that the complex of engineering and biological measures provides an ecologically measurable effect and positive project economics with a 15-year horizon. The results are consistent with modern data on increased efficiency when combining gypsum with organic ameliorants and/or phytoremediation. The practical significance lies in the algorithm for justifying investments in reclamation for regions with a humid climate and technogenic halogenesis. The analysis demonstrates that strategic investments in ecological restoration can be transformed into a form of economic benefit, ensuring a balance between the interests of business and society.