Project #4348

Matrix Effects on Cryptosporidium Oocyst Recovery

Principal Investigator
Research Manager
Ms. Jennifer I Warner
Tetra Tech, Inc.
Microbes & Pathogens


Through extensive statistical and laboratory analyses, this study found a set of likely causes of poor Cryptosporidium oocyst recovery in Portland Water Bureau source water from the Bull Run watershed at certain times of the year. The report presents a modification to EPA Method 1623 that improved oocyst recovery for Portland Water Bureau, and this research contributes to an improved understanding of the role that water matrices play in inhibiting oocyst recovery. Tailored collaboration partner: City of Portland Water Bureau. Published in 2014.