The EPAs Part 503 rule provides comprehensive requirements for the management of biosolids generated during the process of treating municipal wastewater. It creates incentives for beneficial use of biosolids. This guide was developed to help make the Rule more understandable. It can be a very helpful tool for the rule's interpretation & implementation. This document provides separate, complete descriptions of the requirements associated with land application, surface disposal, incineration, pathogen & vector attraction reduction, & sampling & analysis. Extensive appendices. References. Illustrated.

The website is a starting place to find information and legislation on applying biosolids (sewage sludge) as a fertilizer in the US. The US allows biosolids to be used in agriculture provided it is well hygienized and meets certain quality criteria. The website links to another website that gives a "plain english" guide to EPA Part 503 Biosolids Rule.