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Skip Navigation LinksDNREC : Division of Water : Information : Surface Water Discharges Information : Surface Water Discharges Biosolids


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Land Treatment of Waste (Biosolids and Residuals)

Liquid biosolids being offloaded from a tanker truck for land application. 


Sewage sludges are solid, semisolid, or liquid residues generated during primary, secondary, or advanced treatment of sanitary sewage.  Treated sewage sludge that has undergone an approved process to reduce pathogens, reduce the attractiveness of the material to vectors (flies, birds, rodents), and meets limits for certain pollutants are known as biosolids.  Biosolids are typically utilized as a fertilizer, soil amendment, or disposed of in a landfill in accordance with Part III, B, of the Guidance and Regulations Governing the Land Treatment of Wastes and other state and federal regulations as applicable.

EPA regulations under Title 40 Code of Federal Regulations Part 503 (40 CFR 503), established the minimum national standards for the use and disposal of biosolids. EPA’s standards are incorporated into the DNREC’s regulations, under Part III, B, of the Guidance and Regulations Governing the Land Treatment of Wastes. DNREC’s rules include additional requirements and safeguards that are not required in EPA standards.

Non-Hazardous/Non-Sanitary Wastes/Residuals:

Non-hazardous waste residuals that do not contain a sanitary waste component and can be permitted for agricultural utilization under Part V of the Guidance and Regulations Governing the Land Treatment of Wastes. To be permitted for land application, wastes are required to meet regulatory limits for certain pollutants and must be suitable for utilization as a fertilizer substitute or as a soil amendment.


Related links: 

For more information about land treatment of waste, please call Brian Churchill at 302-739-9946, or via email:

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