This publication proposes a set of standard environmental performance report formats for wastewater utilities and facilitates uniform reporting similar to what is currently used for financial reporting. The publication outlines the environmental reporting equivalent of Generally Accepted Accounting Principles, providing general guidance to wastewater utilities on how information should be compiled and offering standard reporting templates. Important topics covered include: sustainability reporting principles, frameworks, and standards; wastewater system sustainability; wastewater system sustainability indicators; proposed sustainability reporting guidelines; and sustainability reporting drivers and trends