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Figure 2: Evolution of the percentage (%) of national population served by wastewater treatment plants (secondary and tertiary treatment). (Source: Special Secretariat for Water, OECD)

Image Published 18 Feb 2015 Last modified 11 May 2020
Photo: © Anita | Flickr.com
Figure 2: Evolution of the percentage (%) of national population served by wastewater treatment plants (secondary and tertiary treatment). (Source: Special Secretariat for Water, OECD)

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Figure 2: Evolution of the percentage (%) of national population served by wastewater treatment plants (secondary and tertiary treatment). (Source: Special Secretariat for Water, OECD)
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