1. Construction enterprise: The qualification of environmental protection project contracting enterprise is Grade I, II and III.
2. Enterprises engaged in the production and installation of environmental protection equipment: mechanical and electrical equipment installation qualification is Grade I, Grade II and Grade III.
3. Waste water, waste gas, solid waste and domestic waste treatment enterprises: the operating qualifications of environmental pollution control facilities are Grade A, Grade A, Grade B and Grade B ... The operating qualifications are declared from low to high, and approved and issued by the Ministry of Environmental Protection.
4. Other qualification certificates: quality management system certification and environmental management system certification.
General environmental protection qualification will apply for environmental protection engineering professional contracting qualification. Newly established enterprises generally need to apply for the professional contracting qualification of environmental protection engineering, and can undertake the construction of small environmental protection projects such as pollution control projects and domestic waste treatment and disposal projects.