• Type of survey: biennial structural survey
  • Population scope: the population under study is the set of units that provide, whether or not as a main activity, the services classified in the CNAE-2009 in divisions 36 (Water collection, treatment and supply) and 37 (Sewerage)
  • Geographical scope: the entire national territory
  • Reference period: the calendar year
  • Sample size: around 414 units
  • Type of sampling: geographic coverage (population)
  • Collection method: questionnaire completed by the respondent (internet/paper)

Methodological documents, questionnaires, classifications, ...