Combined Sewer Overflows
Nine Minimum Controls

1. Proper operation and regular maintenance programs for the sewer system and the CSOs
2. Maximum use of the collection system for storage
3. Review and modification of pretreatment requirements to assure CSO impacts are minimized
4. Maximization of flow to the publicly owned treatment works for treatment
5. Prohibition of CSOs during dry weather
6. Control of solid and floatable materials in CSOs
7. Pollution prevention
8. Public notification to ensure that the public receives adequate notification of CSO occurrences and CSO impacts
9. Monitoring to effectively characterize CSO impacts and the efficacy of CSO controls

EPA's Guidance for Nine Minimum Controls [PDF Format] describes the nine minimum controls, and EPA's expectations for their implementation, in more detail.

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Last updated on September 12, 2002 6:12 PM
URL:http://cfpub.epa.gov/npdes/cso/ninecontrols.cfm