Covid-19 National SARS-CoV-2 Wastewater Surveillance ROAZ region values by date

Description

This file contains per Regional Consultation Acute Care Chain (ROAZ) region, per day, the average number of SARS-CoV-2 virus particles per 100,000 inhabitants, as calculated from measurements of the number of virus particles per sewage treatment plant (WWTP). The file is structured as follows: For each date since 2020-09-07, the number of SARS-CoV-2 virus particles in sewage per 100,000 inhabitants has been calculated per ROAZ region. This number is a weighted average of the municipalities belonging to the region in question. For each date, for each municipality, the most recent measurement of all WWTPs is weighted according to the number of inhabitants in the municipality served by the relevant WWTP, provided that the most recent measurement is not older than eight days. These values per municipality are summed up over the municipalities belonging to a ROAZ region, and divided by the number of inhabitants observed (that is, the number of inhabitants in a municipality connected to WWTPs that have a measurement that is less than eight days old). This creates a weighted average for the ROAZ region expressed per inhabitant. Multiplying this by 100,000 gives the average number of virus particles per region, per date, per 100,000 inhabitant equivalents. If measurements more recent than 8 days are not available from any of the WWTPs within a ROAZ region, the record shall be ‘NA’. The file contains per ROAZ region all days from 2020-09-07 up to and including the most recent date for which a value can be calculated. As a result, the most recent date may vary by region. The figures are calculated on the basis of the municipal classification in force on the date of the measurement and the most recent classification of the ROAZ regions. Municipal reclassifications are applied on the date of the reclassification. The information on population numbers per WWTP can be found in a turnover table, which is provided by the Central Bureau of Statistics (CBS). The 2020-2021 version: https://www.cbs.nl/en-nl/maatwerk/2021/06/inhabitants-per-sewage treatment plant-1-1-2021 The 2022 version: https://www.cbs.nl/en-nl/maatwerk/2022/42/residents-per-sewage treatment plant-1-1-2022 Which municipalities fall under a ROAZ region can be found on the regional atlas of the Ministry of the Interior and Kingdom Relations. (https://www.regioatlas.nl/region formats/region formats_format/t/roaz_regio_s). All measurements of individual WWTPs on which the ROAZ region figure is based can be found in the open data set at WWTP record level (https://data.rivm.nl/meta/srv/dut/catalog.search#/metadata/a2960b68-9d3f-4dc3-9485-600570cd52b9). Description of variables: Version: Version number of the dataset. When the content of the dataset is structurally changed (i.e. not the daily update or a correction at record level), the version number will be adjusted (+1) and also the corresponding metadata in RIVMdata (data.rivm.nl). Date_of_report: Date the file was created (format: yyyy-mm-dd). Date_measurement: Date covered by the calculation of the average number of virus particles per 100 000 inhabitants (format: yyyy-mm-dd). Region_code_lcps: The code of the ROAZ region, as used by the National Coordination Centre for Patient Dispersion (LCPS). Region_name: Name of the ROAZ region. RNA_flow_per_100000: The calculated number of SARS-CoV-2 RNA particles measured in the sewage water, based on a weighted average of the measurements at WWTPs serving the municipalities in the relevant ROAZ region, shown per 100,000 inhabitants. Because not all measurements are available at the same time, the most recently reported values are subject to change. This may result in differences per publication date of the data. It is also possible that earlier dates are corrected as a result of new laboratory results or corrections in source files of the Water Boards. This file is always based on the most up-to-date data.

Resources

Name Format Description Link
8 https://data.rivm.nl/data/covid-19/COVID-19_rioolwaterdata_roazregio.csv
8 https://data.rivm.nl/data/covid-19/COVID-19_rioolwaterdata_roazregio.csv

Tags

  • sewage
  • coronavirus
  • sars-cov-2
  • rioolwater
  • infectieziekten
  • gezondheid
  • covid-19
  • afvalwater
  • riool

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