Water Quality Permitting and Reporting for Confined Animal Facilities in California

Why It Matters

Gaps in oversight risk contaminating drinking water and burden vulnerable Central Valley communities, posing significant public‑health, environmental, and regulatory liabilities for the state and agricultural sector. Strengthened monitoring and enforcement are needed to prevent ecosystem damage and costly remediation.

Summary

A Stanford Environmental Law Clinic white paper finds California inadequately monitors and enforces water-quality permitting and reporting for confined animal facilities (CAFs), leaving the whereabouts of vast quantities of manure unknown. The report highlights concentrated CAFOs in the Central and Imperial Valleys, documents data and compliance gaps, and links manure runoff and leaching to harmful nutrient pollution, hormonal contaminants, and antibiotic-resistant bacteria. Researchers warn that overapplication of manure threatens surface and groundwater—contributing to algal blooms, fish kills, and human health risks such as methemoglobinemia. The study concludes with recommendations to strengthen permitting, monitoring, and enforcement under the Porter‑Cologne Act.

Original Description

California is home to a significant proportion of the confined animal facilities (CAFs) in the United States, including more large commercial dairies than any other state. These facilities produce millions of pounds of manure each year. If not properly managed, this waste can pollute surface water, contaminate groundwater, and precipitate algal blooms, resulting in potentially severe human health consequences and long-term environmental damage.

Pursuant to the Porter-Cologne Act, the Regional Water Resources Control Boards (Regional Boards) require CAFs to self-report their manure production and waste management practices in annual reports. This webinar will discuss a recently released white paper that analyzed 1,280 annual reports submitted to Regional Boards in 2023 and 2024. The analysis reveals that CAFs often fail to accurately report their waste production and manure disposal practices and, further, that Regional Boards frequently fail to follow up on these serious omissions or inaccuracies. The result is a regulatory system that falls short of California’s water quality and environmental justice goals.