The state health department has fined the city nearly $700,000 for the leak last May that dumped partially-treated sewage into the Arkansas River, killing over 800 fish.
Wichita public works director Alan King said a gate at the plant failed, which allowed the sewage into the river. He also said two plant employees were fired because of the leak.
The city will pay a fine of about $243,000. Another $455,000 will be used to help pay for a study of possible risks at the south Wichita plant.
The city plans to spend another $1.5 million to study its other sewer plants.