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Wastewater Residuals

Residuals are the organic residues removed from wastewater during the treatment process.

These nutrient-rich, solid, semi-solid, or liquid residuals may be incinerated, landfilled, or beneficially reused as fertilizer or compost.

Residuals that comply with state and federal land application regulations to be reused are often called biosolids. Biosolids are a sustainable way to provide nutrients to crops.

Biosolids being composted with a green tractor

Residuals Workgroup

Since 1993, NEIWPCC’s Residuals Workgroup has improved interstate communication on issues associated with residuals from wastewater treatment and on-site sewage disposal. The workgroup, which meets bi-monthly, comprises staff from NEIWPCC and the EPA, and the residuals coordinators from each of NEIWPCC’s member states along with New Jersey, Michigan,  Minnesota, and South Carolina environmental agencies.

The Residuals Workgroup promotes compatibility among state and federal sludge and septage management programs. NEIWPCC provides a forum for interstate discussion as well as technical assistance and coordination. Topics of discussion include per- and polyfluoroalkyl substances, sludge technologies, and short-term and long-term stressors impacting the northeast sewage sludge management system’s available capacity.

View all NEIWPCC Workgroups here.

Biosolids Sampling Guide

In 2006, NEIWPCC published The Wastewater Treatment Plant Operators Guide to Biosolids Sampling Plans. This guidance document is intended to help wastewater treatment plant operators develop a comprehensive sludge (or biosolids) sampling plan. Unlike other sludge sampling guidance documents that provide general recommendations, this guide was developed to be as specific as possible and provide easily adaptable worksheets and appendices that can be used to form a suitable sludge sampling plan. The manual covers proper sample collection, handling, and documentation procedures; laboratory and detection limit considerations; and data reporting.

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