Drinking Water Quality (residual chlorine)

Outcome indicator, Output indicator

Indicator Phrasing

% of [select: targeted water points / household water samples] with free residual chlorine between 0.2 and 0.5 mg/l
% de [sélectionner: points d’eau cibles/ échantillons d’eau domestique] contenant de 0.2 à 0.5 mg de chlore résiduel libre par litre
% [určete: cílových vodních zdrojů / vzorků vody domácností] s přítomností volného chloru v hodnotách od 0.2 do 0.5 mg/l

Indicator Phrasing

English: % of [select: targeted water points / household water samples] with free residual chlorine between 0.2 and 0.5 mg/l

French: % de [sélectionner: points d’eau cibles/ échantillons d’eau domestique] contenant de 0.2 à 0.5 mg de chlore résiduel libre par litre

Czech: % [určete: cílových vodních zdrojů / vzorků vody domácností] s přítomností volného chloru v hodnotách od 0.2 do 0.5 mg/l

What is its purpose?

This indicator measures if disinfection of the drinking water is correctly implemented at the source level or at household level.

How to Collect and Analyse the Required Data

1) Consult your WASH advisor and/or relevant WASH authorities on how to measure free residual chlorine (FRC) using a pool tester.

 

2) Ensure that the water samples are collected from all targeted water points or from a representative sample of households.

 

3) Calculate the indicator's value by dividing the number of targeted water points / household water samples with the correct level of FRC by the total number of assessed water samples. Multiply the result by 100.

Important Comments

1) Measuring FRC is cheaper and faster than measuring faecal contamination but is only applicable when drinking water is disinfected either at the water source or by the household itself (with aquatabs or other similar reagent).

 

2) At the source level, this indicator will give a sense of the quality of the water committees’ work. At household level, this indicator assesses the correct usage of the reagent.

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