Discharges of pollutants from wastewater are carried out during the maintenance and preparation of wagons for operation associated with their washing and flushing.

In 2023, discharges of pollutants from wastewater amounted to 273 tons, which is 4% less than the level of 2022 (284 tons).

The decrease in discharge volumes occurred due to the ongoing repair of sewage treatment plants of the branches of Temirzholsu JSC - TZHS-Ayagoz and TZHS-Mangistau, as well as due to the transfer of facilities at the Shu and Taraz station site to local executive bodies in June 2023.

When washing wagons, the company discharges wastewater to filtration fields, storage tanks, and wastewater disposal is carried out in a septic tank with a filter well. Wastewater after treatment is exported for discharge into the city sewer system. The Company does not discharge polluted waters into natural surface reservoirs.

The calculation of the maximum permissible discharge standards is carried out on the basis of the Environmental Code of the Republic of Kazakhstan.

The main ingredients polluting the water body are petroleum products, phenols, nitrates, nitrites, ammonium nitrogen, suspended solids, phosphates, chlorides, sulfates, etc.