71In the first place, concerning the seriousness of the infringement, it should be borne in mind that Directive 91/271 is intended to protect the environment. A lack or shortage of urban waste water treatment plants is likely to harm the environment and must be regarded as particularly serious (judgment of 15 October 2015 in Commission v Greece, C‑167/14, EU:C:2015:684, paragraph 55 and the case-law cited).
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