Overview
ORLEIX Chis is an advanced wastewater treatment plant in Chis, Occitanie, France, serving 1,900 people with a designed capacity of 2,500 m³/day and a discharge volume of 338.96 m³/day.
ORLEIX Chis is a wastewater treatment facility located in Chis, a commune in the Hautes-Pyrénées department of Occitanie, southern France. The plant serves a population of approximately 1,900 residents and is part of the municipal infrastructure managed under French water regulations. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 2,500 m³/day and an actual discharge volume of 338.96 m³/day, the facility operates well below its capacity, indicating room for future growth or seasonal variations. As a French plant, it operates under the national transposition of the EU Urban Waste Water Treatment Directive (91/271/EEC), which requires appropriate treatment levels based on the sensitivity of receiving waters. The treated effluent is discharged into local watercourses that ultimately drain into the Adour River basin, flowing toward the Bay of Biscay. The plant plays a key role in protecting the region's water quality, supporting aquatic ecosystems and downstream uses such as agriculture and recreation.
Environmental context
The plant discharges into the Adour River basin, which flows through the Pyrenees foothills and eventually reaches the Bay of Biscay. This watershed supports diverse aquatic life, including migratory fish species, and is ecologically sensitive due to agricultural runoff and urban pressures. Advanced treatment helps reduce nutrient loading, protecting downstream water quality.
Frequently asked questions
The ORLEIX Chis plant is located in Chis, a commune in the Hautes-Pyrénées department of the Occitanie region in southern France.
The plant serves approximately 1,900 people, classifying it as a small agglomeration under EU wastewater directives.
The treated effluent is discharged into local watercourses within the Adour River basin, which flows to the Bay of Biscay. The plant uses advanced treatment to ensure high-quality discharge.
The plant provides advanced treatment, which includes nutrient removal beyond secondary treatment, meeting stringent standards for sensitive areas under the EU Urban Waste Water Treatment Directive.
As a French facility, the plant operates under the EU Urban Waste Water Treatment Directive (91/271/EEC), transposed into French law, which mandates appropriate treatment levels based on population size and receiving water sensitivity.
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