Certifications

With 16 years of expertise in the water treatment industry, Di Ao Group has established a strong reputation for innovation, reliability, and engineering excellence. The company holds more than 20 patents in water treatment technologies and over 40 engineering certifications, demonstrating its strong technical capabilities and compliance with international standards.

Over the years, Di Ao Group has successfully delivered more than 7,900 water treatment projects worldwide, serving a wide range of industries including manufacturing, municipal water supply, food processing, and environmental protection. From industrial water purification to wastewater treatment and seawater desalination systems, Di Ao Group is committed to providing efficient, reliable, and customized water treatment solutions for global clients.

Certificate Name	Remarks	Certificate Name	Remarks
Group Business License	Registered capital of 30 million yuan	Batch Production License for Large-scale Water Treatment Equipment	DASZ Large-scale Water Treatment Equipment DAWT Large-scale Water Treatment Equipment
High-tech Enterprise Certificate	Gr2025611000708	Batch Production License for Small-scale Disinfection Equipment	DAWT (DABASH-50-500G Type) Chlorine Dioxide Generator
National Science and Technology Enterprise for SMEs	2023611120810692	Batch Production License for Large-scale Disinfection Equipment	DAWT (DABASH-1000-5000G Type) Chlorine Dioxide Generator
Special Equipment Manufacturing License	Public pipeline (GB2) Industrial pressure pipeline (GC2)	Filter Material Testing Report	Quartz sand, Activated carbon, Polypropylene filter cloth, Cation exchange resin, Quartz sand
Engineering Design Qualification	Environmental Engineering (Water Pollution Prevention & Control) Grade A Municipal Public Works (Water Engineering) Grade B Municipal Public Works Grade B Intelligent Building System Design Grade B Environmental Engineering (Pollution Remediation) Grade B Municipal Public Works (Environmental Sanitation) Grade B Environmental Engineering (Air Pollution Prevention & Control) Grade B Environmental Engineering (Solid Waste Pollution Prevention & Control) Grade B	Intelligent Control 3C Certification	Automatic Control System
Engineering Contracting Qualification	Mechanical & Electrical Engineering General Contracting Grade 2 Municipal Public Works General Contracting Grade 2 Environmental Protection Engineering Professional Contracting Grade 2	Two-integration Management System Certificate	GB/T 23001 T/AIITRE10003
Engineering Contracting Qualification	Water Conservancy & Hydropower Engineering General Contracting Grade 2 Mining Engineering General Contracting Grade 2 Petrochemical Engineering General Contracting Grade 2 Fire-fighting Facilities Professional Contracting Grade 2 Construction Labor Service (No Grade Classification for Professional Contracting) Construction Labor Service General Contracting (No Grade Classification)	Three-system Certification	Quality Management (ISO9001) Environmental Management (ISO14001) Occupational Health & Safety (ISO45001)
Labor Service Qualification	Construction Labor Service Qualification (No Grade Classification)	Registered Trademark	Zhongao Aotong
Safety Production License	(Shan) AJ Anzhengzi (2019) 012405	Software Copyright	Intelligent control system for sewage treatment, water supply equipment, direct drinking water, industrial wastewater treatment, and large-scale water treatment
Batch Production License for Water Supply Equipment	Zhongao DAGS Type Negative Pressure-free Water Supply Equipment	Dual Certification	Embedded Software Products
Batch Production License for Stainless Steel Water Tanks	DA Stainless Steel Water Tanks	Engineering Quality Complaint-free Demonstration Unit	Top 10 Most Influential Enterprises in Western Shaanxi
Batch Production License for Reverse Osmosis Water Equipment	Zhongao Aotong DARO Large-scale Reverse Osmosis Water Treatment Equipment	National AAA Credit	Quality Service Credit Unit, Enterprise Credit Grade Certificate, Business Credit Unit, Heavy Contract & Credit Unit, Heavy Quality & Credit Unit, Enterprise Credit Grade, National Credit Enterprise
Batch Production License for Reverse Osmosis Water Treatment Equipment	DARO Large-scale Reverse Osmosis Water Treatment Equipment	Patent Certificate	25 items in total