San Diego homes and businesses have been improperly charged for a program that keeps toxic sewer water from being discharged into the Pacific Ocean.

A new report from Interim City Auditor Kyle Elser said the city failed to charge Industrial Wastewater Control Program permit holders enough to cover the costs of the program.

According to the City Auditor’s Office, many of the fees charged to industrial polluters have not been adjusted since 1984. The Public Utilities Department agreed to adjust the fees last year, but failed to do so, according to the San Diego Union-Tribune.