This work is aimed to evaluate the influence of operating conditions on the removal of Cr (VI) from wastewater by the application of electrocoagulation. For this, a bench-scale electrocoagulation reactor provided with aluminum stainless steel electrodes was built and used in the treatment of chromium-containing synthetic wastewater in a range of 10–50 mg/L. According to our results, the use of stainless steel electrodes placed with a gap separation of 1.0–2.0 cm, initial pH of 8.5, and 30 V electric potential led to the best results. Additionally, by a simplified operating costs estimation it was found that from 7.04 to 8.13 USD/m3 are required to reach complete removal of Cr (VI).