Online-only Table 1 List of all electrical conductivity datasets that make up the final database, including the number of monitoring stations and total number of measurements, by water type and data source.

From: A global dataset of surface water and groundwater salinity measurements from 1980–2019

Source Water Type Nr of Stations Nr of measurements Data Reference/URL
AU Gov River 1,316 4,989,322 http://www.bom.gov.au/waterdata/
AU Gov Lake/Reservoir 5 16,234 http://www.bom.gov.au/waterdata/
AU GwEX Groundwater 88,513 746,189 http://www.bom.gov.au/water/groundwater/explorer/map.shtml
BAP Groundwater 641 641 https://data.gov.au/data/dataset/b5dd0f26-1afa-4a86-8c41-0ed56f86843e
BWDB Groundwater 511 661 Bangladesh Water Development Board (shared by M.M. Rahman)
CA Gov River 56 20,252 http://data.ec.gc.ca/data/substances/monitor/national-long-term-water-quality-monitoring-data/?lang=en
Co Gov Groundwater 217 12,994 https://www.colorado.gov/agconservation/groundwaterprotection
DWS Groundwater 23 668 http://www.dwa.gov.za/iwqs/wms/data/000key.asp
DWS River 1,755 485,990 http://www.dwa.gov.za/iwqs/wms/data/000key.asp
DWS Lake/Reservoir 13 3,359 http://www.dwa.gov.za/iwqs/wms/data/000key.asp
Dat.ar Groundwater 333 456 http://datar.noip.me/dataset/pozos-sifas
GAMA Groundwater 2,471 5,837 https://data.ca.gov/dataset/ground-water-water-quality-results
GLORICH River 2,656 417,196 https://doi.org/10.1594/PANGAEA.902360
GLORICH Lake/Reservoir 4 1,097 https://doi.org/10.1594/PANGAEA.902360
Hundt et al. 2018* Groundwater 3,016 9,182 https://doi.org/10.5066/F72V2FBG
ICPDR River 117 36,215 https://www.icpdr.org/wq-db/wq/search
MX Gov River 1,412 53,750 https://www.gob.mx/conagua/articulos/calidad-del-agua
Metzger et al. 2018* Groundwater 210 221 https://doi.org/10.5066/F7RN373C
NIWA River 33 18,708 https://hydrowebportal.niwa.co.nz/Data/
Naus et al. 2019 Groundwater 112 112 https://doi.org/10.5194/hess-23-1431-2019
Ohio EPA Groundwater 348 4,655 https://epa.ohio.gov/
Ontario Gov River 259 34,567 https://data.ontario.ca/dataset/provincial-stream-water-quality-monitoring-network
QLD AU Gov River 16 116,880 https://www.data.qld.gov.au/
Qi & Harris 2017 Groundwater 101,235 101,235 https://doi.org/10.5066/F72F7KK1
SGU Groundwater 133 4,873 https://www.sgu.se/
TWDB Groundwater 10,963 25,075 http://www.twdb.texas.gov/groundwater/data/gwdbrpt.asp
WQP Groundwater 658 4,039 https://www.waterqualitydata.us/
WQP River 25,360 4,708,764 https://www.waterqualitydata.us/
WQP Lake/Reservoir 10,329 4,389,080 https://www.waterqualitydata.us/
WSP Groundwater 8 976 https://cambodiawellmap.com/worldbank/maps
Waterbase River 1,508 79,242 https://www.eea.europa.eu/data-and-maps/data/waterbase-water-quality-2
Waterbase Lake/Reservoir 260 11,213 https://www.eea.europa.eu/data-and-maps/data/waterbase-water-quality-2
Waterbase Groundwater 90 6,387 https://www.eea.europa.eu/data-and-maps/data/waterbase-water-quality-2
Waterconnect Groundwater 1,221 26,704 https://www.waterconnect.sa.gov.au
Waterconnect River 6 47,462 https://www.waterconnect.sa.gov.au
van Engelen et al. 2019* Groundwater 251 251 https://doi.org/10.5194/hess-23-5175-2019
  1. Included is also data references/URL. Data sources marked with a * indicate TDS datasets, which were converted to EC. All datasets either have original licenses that permit unrestricted reuse, or were granted from the data owners for release under the CC-BY license.