Veterinary Medicine Extension

Photo: San Joaquin Delta
Cattle grazing along Cache Slough

Sacramento-San Joaquin Delta

USE OF INDICATOR BACTERIA TO OPTIMIZE MONITORING OF THE SACRAMENTO-SAN JOAQUIN DELTA ESTUARY FOR POTENTIAL SOURCES OF PATHOGEN LOADING

Participants: Dr. E. R. Atwill. Ronald F. Bond, Melissa L. Partyka, Dr. Xunde Li, Jennifer Carabez, Kristine L. Ferdandez, Chengling Xiao

Both dairy and beef cattle graze throughout the eastern Delta, often in close proximity to the complex network of tidal sloughs and tributaries that make up this portion of the Delta Estuary. Primary routes of waterborne contamination from animal agriculture tend to occur by two main processes: (1) during the rainfall season when pasture runoff is contaminated with livestock fecal material and (2) during summer dry season, from a combination of direct fecal deposition by grazing livestock and from contaminated runoff from either irrigated pastures or row crops fertilized with animal manure.

Final Report to State Water Resources Control Board pdf.