The livestock industry is a significant part of Taiwan's agricultural production, with an annual production value exceeding NT$100 billion, accounting for over 33% of total agricultural production. Over several decades, Taiwan's livestock industry has evolved from small-scale, family-based operations to professional and intensive management, contributing significantly to the prosperity of rural economies and social stability. 

However, this development has been accompanied by substantial wastewater and waste, a common topic of public concern.

In recent years, with growing environmental awareness, the public has raised expectations for the quality of the environment that we live in. Livestock wastewater, domestic wastewater, and industrial wastewater have become three major environmental challenges.

Article 2 Subparagraph 7 of the Water Pollution Control Act (WPC Act) mandates the establishment of the Classification and Definition of Water Pollution Prevention and Control Law. According to provisions for "No. 53 Livestock Industry", operations raising over 20 pigs or more than 50 cattle are subject to Water Pollution Control Act under "Livestock Industry."