שאלה | Which of the following sentences is false regarding the maintenance of downstream water quality?

Which of the following sentences is false regarding the maintenance of downstream water quality?

		Upstream users of cross-border water have water rights based on historical water use over the years, but they must monitor the downstream water quality.
		Downstream users of cross-border water have historical water quality rights
		Downstream users of cross-border water have the same water quality rights as the upstream water users.
		Downstream users of cross-border water have the same water quality rights as those that prevailed in the past.