This study aims to 1) analyze the wastewater treatment system in IPAL STP Lagoon Duri PT. Chevron Pacific Indonesia, 2) Analyzing the quality of the results of wastewater treatment at the IPAL STP Lagoon Duri PT. Chevron Pacific Indonesia, 3) Analyzing the effectiveness of wastewater treatment at the IPAL STP Lagoon Duri PT. Chevron Pacific Indonesia. The research was conducted with a quantitat…