STP Paonta Sahib Zone I - Secondary Wastewater Treatment Plant in Paonta Sahib, Himachal Pradesh

STP Paonta Sahib Zone I is a wastewater treatment facility located in Paonta Sahib, Sirmaur district, Himachal Pradesh, India. The plant provides secondary treatment for a population of 2,940, serving the local community in the Yamuna River basin region. The plant operates with a designed capacity of 440 cubic meters per day and treats a similar volume of wastewater. As a secondary treatment facility, it meets the standards expected under India's environmental regulations for urban agglomerations of this size, which typically require biological treatment to reduce organic load and suspended solids. The treated effluent is discharged into local water bodies that ultimately drain into the Yamuna River system. The plant plays a key role in protecting downstream water quality in the Yamuna basin, which supports agriculture, drinking water supplies, and aquatic ecosystems in the region.

The plant discharges into local streams that feed the Yamuna River, a major tributary of the Ganges. The Yamuna basin supports diverse aquatic life and provides water for irrigation and domestic use. The plant's secondary treatment helps reduce pollution loads in this ecologically sensitive river system, which flows through densely populated areas before joining the Ganges.