Abbreviation	Water Parameter	Abbreviation	Machine Learning Algorithm	Abbreviation	Others
AN	ammoniacal nitrogen	ANN	artificial neural network	$Actua{l}_i$	actual value of parameter $i$ in the tested water samples
BOD	biological oxygen demand	BPNN	back propagation NN	AI	artificial intelligence
Ca	calcium	DT	decision tree regression	$Idea{l}_i$	the optimal parameter value $i$ in pure water
CO	electrical conductivity	ET	extra tree regression	MAE	mean absolute error
COD	chemical oxygen demand	LR	linear regression	MSE	mean square error
DO	dissolved oxygen	MLP	multilayer perceptron	$r$	correlation coefficient
FC	faecal coliform	RBFNN	radial basis function NN	RMSE	root mean square error
K	potassium	RF	random forest regression	SDG	Sustainable Development Goals
Mg	magnesium	SVR	support vector regression	$Standar{d}_i$	the suggested parameter standard value $i$
NH4+	ammonium			UN	United Nation
NO3− i.e., Na	nitrate			UNEP	United Nations Environment Program
NO3−N	nitrate-nitrogen			$w_i$	each feature’s unit weight
NO2−N	nitrite-nitrogen			WQI	Water Quality Index
pH	potential for hydrogen			$WQ{R}_i$	Water quality rating scale for each feature $i$
PO43-	Phosphate			$WQW{S}_i$	water quality weight score for each feature $i$
PO4−P	phosphate
SO42−	sulfur
SS	suspended solids
T	temperature
TC	total coliform
TDS	total dissolved solids
TH	total hardness
TN	total nitrogen
TS	total solids
TUR	turbidity