Alshukri H. and Tsarev N.S. 2026. environmental performance assessment of three municipal wastewater treatment plants in Al-Najaf, Iraq using the CCME water quality index (CCME-WQI). The system technologies. 58 (Apr. 2026), 82–96. DOI:https://doi.org/10.55287/22275398_2026_58_82-96.