Early indicators

Virus particles in wastewater Twente

If you are infected with coronavirus, there are likely to be virus particles in your stool. These are flushed down the toilet and end up in wastewater. By testing samples of wastewater collected at wastewater treatment plants, we can get information about how widespread the virus is in the community. To find out more about the information on this page, go to ‘Explanation of the data presented’.

Last values obtained on Thursday, 17 June. Is updated on a daily basis.

Source: RIVM

Download data: RIVM

Average number of coronavirus particles per 100,000 inhabitants

26.9 less than the previous value
x100 billion

An average is calculated based on all the wastewater measurements collected in one week. It also takes account of how many inhabitants are served by a specific wastewater treatment plant, and how much of the wastewater flowing to the plant comes from the safety region.

Value from Monday, 7 June - Sunday, 13 June · Source: RIVM

Number of measurements per week


21 of the 21 sampling locations reported at least one measurement in the given week.

Sampling locations can report multiple measurements per week. The number of measurements used per location per week can differ because not all measurements are successful.

Value from Monday, 7 June - Sunday, 13 June · Source: RIVM

Average number of virus particles over time (per 100,000 inhabitants)

This graph shows the average number of virus particles over time per 100,000 inhabitants.

x100 billion
1 Oct1 Jan1 Apr06001,200
  • Weekly average for safety region
  • Individual measurements

Source: RIVM