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Data reference period	Geographic localization	Proportion of surface water quality monitoring stations (%) by Type of inland surface water and Nitrates concentration class; Quadrennial
		Type of inland surface water
		1: Rivers or streams					2: Reservoirs or lagoons
		Nitrates concentration class
		1: [0; 2[ mg NO3/l	2: [2; 10[ mg NO3/l	3: [10; 25[ mg NO3/l	4: [25; 50[ mg NO3/l	5: ≥ 50 mg NO3/l	1: [0; 2[ mg NO3/l	2: [2; 10[ mg NO3/l	3: [10; 25[ mg NO3/l	4: [25; 50[ mg NO3/l	5: ≥ 50 mg NO3/l
		%	%	%	%	%	%	%	%	%	%
2016 - 2019	1: Continente	19	72	9	0	0	56	44	0	0	0
	2: Região Autónoma dos Açores	64	36	0	0	0	100	0	0	0	0
	3: Região Autónoma da Madeira	74	24	2	0	0	x	x	x	x	x
Proportion of surface water quality monitoring stations (%) by Type of inland surface water and Nitrates concentration class; Quadrennial - Portuguese Environment Agency

This data last updated:december 22, 2020