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The TWWTP implements an Industrial Pretreatment Program (IPP) to control pollutants which may cause pass through or interfere with the treatment plant’s processes and collection system, which may contaminate sewage sludge, or potentially be hazardous to workers health and safety. Currently there are forty-two permitted industries that are regularly inspected and monitored to ensure their discharges meet specific permit limits. Nine of these industries are Significant Industrial Users (SIUs).