A court may abstain from adjudicating a suit that seeks equitable remedies if granting the requested relief would require a trial court to assume the functions of an administrative agency, or to interfere with the functions of an administrative agency. Here, plaintiff sought injunctive relief against a local water service district to prevent a particular employee from operating its water chlorination equipment because he lacked the required certification by the State Water Resources Board. Plaintiff had filed a similar complaint with that board which was proceeding to adjudicate it. Meanwhile the employee had obtained operator certification from the board. The court finds that the board is better situated than the courts to decide whether the activities in which the employee engaged were the sort of functions for which certification was required, and affirms denial of a preliminary injunction on that ground