Table 2 Organisational websites to be searched

Organisations in Europe

 EEA (European Environment Agency)

https://www.eea.europa.eu

 DCE (Danish Centre for Environment and Energy)

https://dce.au.dk

 Miljøstyrelsen (Danish Environmental Protection Agency)

https://mst.dk

 Luke (Natural Resources Institute Finland)

https://www.luke.fi

 SYKE (Finnish Environment Institute)

https://www.syke.fi

 Umweltbundesamt (German Environment Agency)

https://www.umweltbundesamt.de

 PIA (Development and assessment institute in waste water technology at RWTH Aachen University, Germany)

https://www.pia-gmbh.com

https://www.pia.rwth-aachen.de

 EPA Ireland (Environmental Protection Agency, Ireland)

https://epa.ie

 STOWA (Foundation for Applied Water Research, in the Netherlands)

https://www.stowa.nl

 Wageningen Environmental Research (Research Institute in the Netherlands)

https://www.wur.nl/en/Research-Results/Research-Institutes/Environmental-Research.htm

 Miljødirektoratet (Norwegian Environment Agency)

https://www.miljodirektoratet.no

 NIBIO (Norwegian Institute of Bioeconomy Research)

https://www.nibio.no

 NIVA (Norwegian Institute for Water Research)

https://www.niva.no

 NTNU (Norwegian University of Science and Technology)

https://www.ntnu.no

 Tidsskriftet VANN (Water, a Norwegian journal)

https://vannforeningen.no/tidsskriftet-vann

 Havs-och vattenmyndigheten (Swedish Agency for Marine and Water Management)

https://www.havochvatten.se

 IVL (Swedish Environmental Research Institute)

https://www.ivl.se

 Länsstyrelser i Sverige (County Administrative Boards in Sweden)

https://www.lansstyrelsen.se

 Naturvårdsverket (Swedish Environmental Protection Agency)

https://www.naturvardsverket.se

 SGU (Geological Survey of Sweden)

https://www.sgu.se

 SLU (Swedish University of Agricultural Sciences)

https://www.slu.se

 SMED (Swedish Environmental Emissions Data)

https://www.smed.se

 Svenskt Vatten (Swedish Water & Wastewater Association)

https://www.svensktvatten.se

 Tidskriften Vatten (Water, a Swedish journal)

https://www.tidskriftenvatten.se

 DEFRA (Department for Environment, Food & Rural Affairs)

https://www.gov.uk/government/organisations/department-for-environment-food-rural-affairs

 SEPA (Scottish Environmental Protection Agency)

https://www.sepa.org.uk

Organisations in North America

 INRS (The Institut national de la recherche scientifique, in Canada)

https://www.inrs.ca

 EPA U.S. (Environmental Protection Agency, United States)

https://www.epa.gov

 NOWRA (National Onsite Wastewater Recycling Association)

https://www.nowra.org/

Organisations in other parts of the world

 CSIRO (Commonwealth Scientific and Industrial Research Organisation, in Australia)

https://www.csiro.au