- A legal case initiated by individuals under the terms of an environmental regulation that allows private individuals to take legal action against those who violate the regulation. These cases may result in court-ordered remedial measures and, in some cases, the imposition of penalties
- The local community filed a citizen suit against the factory for dumping waste into the river.
- After observing the smog levels from the power plant, the residents decided to file a citizen suit.
- A citizen suit was brought against the company for its failure to dispose of hazardous waste properly.