Ottawa COVID-19 wastewater surveillance

613COVID Website Update

Ottawa wastewater surveillance continues with daily testing and analysis performed in the lab of Dr. Robert Delatolla, Professor, Department of Civil Engineering, University of Ottawa, who has led that work since its inception in April 2020.

The lab, led by Dr. Delatolla, has expanded its focus beyond SARS-CoV-2 to include influenza and RSV viruses, with the data being regularly reported on the official website.

Please follow @DelatollaLab on X (Twitter) for further contextualization of the data.

Acknowledgments are extended to Dr. Doug Manuel and Dr. Tyson Graber for their valuable contributions and support during the unprecedented times of the pandemic and beyond. The collaborative efforts reflect a commitment to advancing public health initiatives through innovative research and data analysis.

Wastewater surveillance continues to be a key indicator to monitoring COVID-19 and other illnesses and there are ongoing efforts towards building a national wastewater dashboard. We are honoured to have so many people in Ottawa use, consult, and support our application

Wastewater plots last updated: 27 May, 2024, 16:03:11

Wastewater samples collected up to: 23 May, 2024

Reported date up to: 27 May, 2024

The website is updated Monday to Friday at approximately 5 p.m. Updates can be delayed if measurements do not pass quality assurance and quality control checks.

Samples that are collected from Monday to Thursday are processed the day after collection. The website and plots are updated the day after processing. Samples that are collected from Friday to Sunday are processed on Monday and thus are posted to the website on Tuesday at 5 p.m.

People with COVID-19 shed the causative SARS-CoV-2 virus in their stool, regardless of whether they have symptoms, receive a COVID-19 test or ever are diagnosed. Thus, in contrast to assessing community COVID-19 levels by measuring the number of active cases, which may miss asymptomatic infections as well as be subject to limited test availability, wastewater surveillance consistently captures most of the population with COVID-19 given that everyone goes to the washroom. In addition to serving as a valuable confirmatory data source for COVID-19 levels, wastewater can also serve as early indicator for possible outbreaks, as described below.


For mobile users, dragging the plot while in landscape mode will allow you to view current data. Using the display options at the top allows you to modify the view by zooming in and out of the plot.

Data last reported 2024-05-24. Click here for more details on wastewater data reporting.

*Rolling mean viral signal omits dates (coloured in blue) flagged by wastewater researchers with potential data concerns. Data is currently being studied for effects of snow melt and other diluting factors on RNA signal.


The next plot illustrates the 7-day rolling mean in daily COVID-19 wastewater viral signal. This number is the average of a week’s readings; today’s reading with the previous six days. Also on the graph are various comparators (e.g. reported daily COVID-19 cases, hospitalization count), which can be individually selected by toggling the menu on the right.



Wastewater Projections

Preliminary projections forecasting viral signal are shown below. Projections forecast normalized viral copies per copy based on observed signal data. Caution is encouraged when interpreting results. Methods have not been peer-reviewed, and validation is ongoing.