The Portland Water Bureau has warned the public of a recent finding in their water supply: traces of Cryptosporidium were found in the Bull Run Watershed intake, which is the primary source for Portland's drinking water. According to a release from the Portland Water Bureau, one Cryptosporidium oocyst was detected in samples taken on November 18 and November 19, although no detection was made in samples from November 17 and November 20. This comes after a prior detection on November 12, 2024.
The bureau has also stated that it does not currently treat Cryptosporidium but is obligated to start doing so as part of drinking water regulations. To address the concern, Portland is working to quickly implement a filtration system, with a completion date set for September 30, 2027. In the meantime, interim measures include enhanced watershed protection and increased monitoring. Public health officials have determined that no additional precautions are needed for the general public at this moment.
While most healthy people will recover from Cryptosporidium exposure without treatment, the CDC notes that individuals with weakened immune systems, such as those with AIDS, cancer patients, and transplant recipients taking immunosuppressive drugs, may experience more severe illness. The Portland Water Bureau has followed the advice of the Environmental Protection Agency, urging customers who are immunocompromised to consult with their healthcare professional about the safety of drinking the tap water from Bull Run Watershed.
Residents concerned about their water can refer to the sampling results posted on the city’s website for up-to-date information. The Portland Water Bureau’s commitment towards transparency will ensure to immediately alert the public and media if subsequent testing indicates a threat to public health that necessitates precautions. For more specific inquiries, customers can reach the Water Quality Line at 503-823-7525.
