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Since 2017, the Portland Water Bureau has detected low levels of Cryptosporidium from routine monitoring of source water. The Portland Water Bureau received results from ongoing monitoring from the Bull Run Watershed intake for Cryptosporidium, a potentially disease-causing microorganism. In the 50 liters sampled each day from November 17 to November 20, one Cryptosporidium oocyst was detected from a sample collected on November 18 and November 19. Cryptosporidium was not detected in the samples collected on November 17 or November 20. Prior to this detection, Cryptosporidium was last detected from the Bull Run Watershed intake on November 12, 2024.
The Bull Run Watershed is Portland’s primary source of drinking water. The Portland Water Bureau does not currently treat for Cryptosporidium, but is required to do so under drinking water regulations. Portland is working to install filtration by September 30, 2027 under a compliance schedule with the Oregon Health Authority. In the meantime, Portland Water Bureau is implementing interim measures such as watershed protection and additional monitoring to protect public health. Consultation with public health officials has concluded that at this time, customers do not need to take any additional precautions.
Exposure to Cryptosporidium can cause cryptosporidiosis, a serious illness. Symptoms can include diarrhea, vomiting, fever and stomach pain. People with healthy immune systems recover without medical treatment. According to the Centers for Disease Control and Prevention (CDC), people with severely weakened immune systems are at risk for more serious disease. Symptoms may be more severe and could lead to serious or life-threatening illness. Examples of people with weakened immune systems include those with AIDS, those with inherited diseases that affect the immune system, and cancer and transplant patients who are taking certain immunosuppressive drugs.
The Environmental Protection Agency advises that customers who are immunocompromised and receive their drinking water from the Bull Run Watershed consult with their healthcare professional about the safety of drinking the tap water. The Portland Water Bureau and Burlington, City of Gresham, City of Sandy, City of Tualatin, Green Valley, GNR, Hideaway Hills, Lake Grove, Lorna Domestic Water, Lusted, Palatine Hill, Pleasant Home, Raleigh, Rockwood, Skyview Acres, Tualatin Valley, Two Rivers, Valley View and West Slope Water Districts receive all or part of their drinking water supply from Bull Run. To learn if your drinking water comes from Bull Run, please contact your local drinking water provider.
The public and the media are encouraged to view all sampling results posted to the City’s website at portland.gov/water/cryptoresults. The bureau will notify the media and public immediately should further test results indicate a risk to public health and precautions are necessary.
Customers with questions regarding water quality can call the Water Quality Line at 503-823-7525.
About the Portland Water Bureau
The Portland Water Bureau serves water to almost a million people in the Portland area. Portland’s water system includes two great water sources, 53 tanks and reservoirs, and 2,200 miles of pipes. With 600 employees working on everything from water treatment to customer service, the Water Bureau is committed to serving excellent water every minute of every day.
Since 2017, the Portland Water Bureau has detected low levels of Cryptosporidium from routine monitoring of source water. The Portland Water Bureau received results from ongoing monitoring from the Bull Run Watershed intake for Cryptosporidium, a potentially disease-causing microorganism.In the 50 liters sampled each day from November 10 to November 13, one Cryptosporidium oocyst was detected from a sample collected on November 12. Cryptosporidium was not detected in the samples collected on November 10, November 11, or November 13. Prior to this detection, Cryptosporidium was last detected from the Bull Run Watershed intake on November 5, 2024.
The Bull Run Watershed is Portland’s primary source of drinking water. The Portland Water Bureau does not currently treat for Cryptosporidium, but is required to do so under drinking water regulations. Portland is working to install filtration by September 30, 2027 under a compliance schedule with the Oregon Health Authority. In the meantime, Portland Water Bureau is implementing interim measures such as watershed protection and additional monitoring to protect public health. Consultation with public health officials has concluded that at this time, customers do not need to take any additional precautions.
Exposure to Cryptosporidium can cause cryptosporidiosis, a serious illness. Symptoms can include diarrhea, vomiting, fever and stomach pain. People with healthy immune systems recover without medical treatment. According to the Centers for Disease Control and Prevention (CDC), people with severely weakened immune systems are at risk for more serious disease. Symptoms may be more severe and could lead to serious or life-threatening illness. Examples of people with weakened immune systems include those with AIDS, those with inherited diseases that affect the immune system, and cancer and transplant patients who are taking certain immunosuppressive drugs.
The Environmental Protection Agency advises that customers who are immunocompromised and receive their drinking water from the Bull Run Watershed consult with their healthcare professional about the safety of drinking the tap water. The Portland Water Bureau and Burlington, City of Gresham, City of Sandy, City of Tualatin, Green Valley, GNR, Hideaway Hills, Lake Grove, Lorna Domestic Water, Lusted, Palatine Hill, Pleasant Home, Raleigh, Rockwood, Skyview Acres, Tualatin Valley, Two Rivers, Valley View and West Slope Water Districts receive all or part of their drinking water supply from Bull Run. To learn if your drinking water comes from Bull Run, please contact your local drinking water provider.
The public and the media are encouraged to view all sampling results posted to the City’s website at portland.gov/water/cryptoresults. The bureau will notify the media and public immediately should further test results indicate a risk to public health and precautions are necessary.
Customers with questions regarding water quality can call the Water Quality Line at 503-823-7525.
About the Portland Water Bureau
The Portland Water Bureau serves water to almost a million people in the Portland area. Portland’s water system includes two great water sources, 53 tanks and reservoirs, and 2,200 miles of pipes. With 600 employees working on everything from water treatment to customer service, the Water Bureau is committed to serving excellent water every minute of every day.
Since 2017, the Portland Water Bureau has detected low levels of Cryptosporidium from routine monitoring of source water. The Portland Water Bureau received results from ongoing monitoring from the Bull Run Watershed intake for Cryptosporidium, a potentially disease-causing microorganism. In the 50 liters sampled on November 3 and November 5, one Cryptosporidium oocyst was detected in the 50 liters collected on November 5. Cryptosporidium was not detected on November 3. Prior to this detection, Cryptosporidium was last detected from the Bull Run Watershed intake on May 8, 2024.
The Bull Run watershed is Portland’s primary source of drinking water. The Portland Water Bureau does not currently treat for Cryptosporidium, but is required to do so under drinking water regulations. Portland is working to install filtration by September 30, 2027 under a compliance schedule with the Oregon Health Authority. In the meantime, Portland Water Bureau is implementing interim measures such as watershed protection and additional monitoring to protect public health. Consultation with public health officials has concluded that at this time, customers do not need to take any additional precautions.
Exposure to Cryptosporidium can cause cryptosporidiosis, a serious illness. Symptoms can include diarrhea, vomiting, fever and stomach pain. People with healthy immune systems recover without medical treatment. According to the Centers for Disease Control and Prevention (CDC), people with severely weakened immune systems are at risk for more serious disease. Symptoms may be more severe and could lead to serious or life-threatening illness. Examples of people with weakened immune systems include those with AIDS, those with inherited diseases that affect the immune system, and cancer and transplant patients who are taking certain immunosuppressive drugs.
The Environmental Protection Agency advises that customers who are immunocompromised and receive their drinking water from the Bull Run Watershed consult with their healthcare professional about the safety of drinking the tap water. The Portland Water Bureau and Burlington, City of Gresham, City of Sandy, City of Tualatin, Green Valley, GNR, Hideaway Hills, Lake Grove, Lorna Domestic Water, Lusted, Palatine Hill, Pleasant Home, Raleigh, Rockwood, Skyview Acres, Tualatin Valley, Two Rivers, Valley View and West Slope Water Districts receive all or part of their drinking water supply from Bull Run. To learn if your drinking water comes from Bull Run, please contact your local drinking water provider.
The public and the media are encouraged to view all sampling results posted to the City’s website at portland.gov/water/cryptoresults. The bureau will notify the media and public immediately should further test results indicate a risk to public health and precautions are necessary.
Customers with questions regarding water quality can call the Water Quality Line at 503-823-7525.
About the Portland Water Bureau
The Portland Water Bureau serves water to almost a million people in the Portland area. Portland’s water system includes two great water sources, 53 tanks and reservoirs, and 2,200 miles of pipes. With 600 employees working on everything from water treatment to customer service, the Water Bureau is committed to serving excellent water every minute of every day.
Secondary groundwater source provided supplemental water supply during a dry autumn
The Portland Water Bureau has returned to providing 100% Bull Run water to Portlanders. Since October 10th, the Portland Water Bureau has been supplementing the Bull Run supply by blending our secondary water source, groundwater from the Columbia South Shore Well Field, with the Bull Run supply to meet customers’ needs during a warm, dry autumn.
It can take up to two weeks after a transition like this for customers receive 100 percent Bull Run water at their taps, depending on the location.
Careful management of the groundwater system allowed us to provide clean, safe drinking water to the region despite this year’s unseasonably dry fall weather.
“Providing clean and safe drinking water to the region during dry seasons, which are becoming longer due to climate change, requires extensive planning,” Portland Water Bureau Director Edward Campbell said. “We’re working hard to keep the water flowing no matter the weather.”
Our ability to reliably provide clean, safe water for future generations depends on sustaining investments in our water system. Ratepayer funding makes it possible for the bureau to tap two sources of clean, reliable water to adapt to a changing environment.
Portland Water is planning a new filtration facility and pipelines to keep our water safe and abundant for the nearly one million people who depend on it today and for future generations.
Thankful for the water experts who make it happen
Supplying drinking water to nearly one million Oregonians requires a dedicated, highly skilled workforce. The Portland Water Bureau employs about 600 people.
“The complex work to keep our water safe and abundant is easy to overlook when you turn on the tap,” said Kimberly Gupta, Director of Operations. “Public servants including certified operators, engineers, construction crews, customer service staff and lab techs work hard every day to continually protect our health and safety.”
About the Portland Water Bureau
The Portland Water Bureau serves water to almost a million people in the Portland area. Portland’s water system includes two great water sources, 54 tanks and reservoirs, and 2,250 miles of pipes. With 600 employees working on everything from water treatment to customer service, the Water Bureau is committed to serving excellent water every minute of every day.