ae70d0b0_s__lessons_from_five_countries___access_to_safe_drinking_water
[Study assumption] The percentage of water sources found to comply with WHO drinking-water safety guidelines at a single survey date remained constant for a year.
Overestimation, particularly for nitrates and thermotolerant coliform bacteria
WHO | Accounting for water quality in monitoring access to safe drinking-water as part of the Millennium Development Goals: lessons from five countries
Effect on estimated percentage with access to safe drinking-water