STP Dhalli Shimla - Secondary Wastewater Treatment Plant in Dhalli, Himachal Pradesh

STP Dhalli Shimla is a municipal wastewater treatment plant located in Bareha, Dhalli, near Shimla in Himachal Pradesh, India. The plant serves a population of approximately 5,078 people, making it a small-scale facility catering to a local community in the Himalayan foothills. The plant provides secondary treatment, which is the standard biological treatment stage that removes organic matter and suspended solids. With a designed capacity of 760 cubic meters per day, it operates at full capacity based on reported discharge volume. In India, wastewater treatment plants of this scale are typically regulated under the Water (Prevention and Control of Pollution) Act, 1974, and must comply with effluent standards set by the Central Pollution Control Board (CPCB) for discharge into inland surface waters. The treated effluent from STP Dhalli Shimla is likely discharged into a local stream or river that eventually feeds into the Yamuna River basin, which flows through the Indo-Gangetic Plain and ultimately into the Bay of Bengal. The plant plays a crucial role in protecting the fragile Himalayan ecosystem and downstream water quality in the region.

The plant is situated in the Himalayan foothills, an ecologically sensitive region with steep terrain and high rainfall. The treated wastewater likely enters a local tributary of the Yamuna River, which flows through the densely populated plains of northern India before reaching the Bay of Bengal. The downstream environment supports diverse aquatic life and provides water for agriculture and drinking, making effective treatment essential to prevent nutrient pollution and pathogen contamination.