Where is the qualification certificate of water quality operation and maintenance tested?

The first is the personnel engaged in chemical testing in enterprises and institutions, otherwise they can't take the exam.

Qualification certificate is the qualification or identity certificate that should be possessed in a certain occupation. There are two kinds of qualification certificates: practicing qualification certificate and vocational qualification certificate.

Vocational qualification certificate is the proof that workers have the necessary knowledge and skills to engage in a certain occupation. It is the qualification certificate for workers to apply for jobs, take up posts and start businesses, the main basis for employers to recruit workers, and the effective certificate for overseas employment and foreign labor cooperation personnel to notarize their skill level.