Portland residents pulling water from the Bull Run Watershed have been advised to stay vigilant as low levels of the germ Cryptosporidium have been detected, as per a recent report by the Portland Water Bureau. The monitoring, which analyzes 50 liters of water daily from Sunday through Wednesday, found two Cryptosporidium oocysts on Sunday and one oocyst on both Monday and Wednesday, although none were present in the Tuesday sample.
Known for causing cryptosporidiosis, a potentially severe illness symptomatic of diarrhea, vomiting, fever, and stomach pain, the pathogen poses a notable risk, especially to those with weakened immune systems. The Bureau has been on alert since it detected the oocysts, which come well before its 2027 deadline for installing a mandatory treatment plant. Interim measures, such as increasing watershed protection and ramping up monitoring, have been put in place to safeguard public health. These findings follow on the heels of previous detection on March 11.
Health officials, after consulting with the Portland Water Bureau, conclude that the general population need not take additional precautions. However, they underscore that individuals who are immunocompromised should consult with healthcare professionals regarding the safety of drinking tap water. The Environmental Protection Agency echoes this sentiment, specifically for customers relying on water from the Bull Run Watershed.
Numerous districts, including Burlington, City of Gresham, City of Sandy, City of Tualatin, among others, partially or fully draw upon the watershed for their water supply. Customers concerned about their water's origins or safety protocols can contact their local water providers directly for detailed information, while the public can access sample results posted on the City’s website.
