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transparent Nine Minimum Controls

City of Bayonne CSO end-of-pipe netting facility discharging to
New York Bay
Nine Minimum Controls (NMCs) are minimum technology-based controls used to address CSOs without extensive engineering studies or significant construction costs and are in place prior to the implementation of long-term control measures.

Since 1995 permittees which own and/or operate any portion of a combined sewer system are required to comply with the NMCs as per the conditions of the CSO Master General Permit. The individual permits continue to require permittees to comply with all of the NMCs, but have enhanced some of the NMC requirements. 

The National CSO Policy [PDF, 1517 kb] identifies the following NMCs that should be implemented to address CSOs:
Solids and Floatable Material Controls
Solids and floatable material
controls at Village of Ringwood
Park CSO
  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, and
  9. Monitoring to effectively characterize CSO impacts and the efficacy of CSO controls.

USEPA's Guidance for Nine Minimum Controls [PDF, 3779 kb] describes the nine minimum controls and USEPA's expectations for their implementation.


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Department of Environmental Protection
P. O. Box 420
Trenton, NJ 08625

Last Updated: October 3, 2023

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