Whether the environmental organizations had Article III standing when they filed the Clean Water Act citizen suit.
Holding
Yes. The organizations established injury in fact through their members' diminished recreational, aesthetic, and economic use and enjoyment of the North Tyger River and surrounding area.
Reasoning
Article III requires a concrete and particularized injury that is actual or imminent, traceable to the defendant, and likely to be redressed by favorable relief. An association may sue for its members when the members would have standing individually, the interests are germane to the association's purpose, and individual participation is unnecessary.
The relevant injury was injury to the members, not proof that the river itself had suffered measurable environmental harm. Members lived near the facility, used or wished to use identifiable portions of the river, and testified that their reasonable concerns about Laidlaw's ongoing illegal pollutant discharges caused them to refrain from fishing, swimming, canoeing, hiking, picnicking, and similar activities.
These were not generalized allegations about an enormous area or vague plans to visit a place someday. The affidavits and testimony identified concrete recreational, aesthetic, and economic interests directly affected by Laidlaw's discharges. Given that unlawful discharges were ongoing when the complaint was filed, it was entirely reasonable to conclude that nearby residents would curtail their use of the waterway.