. 2016 Mar 17;11(3):e0151645. doi: 10.1371/journal.pone.0151645

Table 3. Scoring system for assessing suitability of census questionnaire content for monitoring progress towards post-2015 targets relating to water.

Indicator (Table 1) definition of post-2015 targets	Corresponding scoring of census questionnaire content
Indicator 2.1: Percentage of population using water from an improved source with a total collection time of 30 minutes or less for a roundtrip, including queuing	(1) Score W₁: the proportion of water source categories that can be unambiguously distinguished as either improved or unimproved; (2) Score W₂: the proportion of off-premises improved water source categories for which collection time or related information (e.g. distance to water source) is available.
Indicator 3.1: Percentage of population using a water source at the household or plot which reliably delivers enough water to meet domestic needs, complies with WHO Guideline Values for E.coli, arsenic and fluoride, and is subject to a verified risk management plan	(1) Score W₁: the proportion of water source categories that can be unambiguously distinguished as either improved or unimproved; (2) Score W₃: the proportion of improved water source categories that can be unambiguously distinguished as either on premises or off premises; (3) Score W₄: the proportion of improved water source categories for which information about water supply interruptions (e.g. in days) is available.

Indicator (Table 1) definition of post-2015 targets

Corresponding scoring of census questionnaire content

Indicator 2.1: Percentage of population using water from an improved source with a total collection time of 30 minutes or less for a roundtrip, including queuing

(1) Score W₁: the proportion of water source categories that can be unambiguously distinguished as either improved or unimproved; (2) Score W₂: the proportion of off-premises improved water source categories for which collection time or related information (e.g. distance to water source) is available.

Indicator 3.1: Percentage of population using a water source at the household or plot which reliably delivers enough water to meet domestic needs, complies with WHO Guideline Values for E.coli, arsenic and fluoride, and is subject to a verified risk management plan

(1) Score W₁: the proportion of water source categories that can be unambiguously distinguished as either improved or unimproved; (2) Score W₃: the proportion of improved water source categories that can be unambiguously distinguished as either on premises or off premises; (3) Score W₄: the proportion of improved water source categories for which information about water supply interruptions (e.g. in days) is available.

Indicator components relevant to each criterion score are highlighted in bold.