1. GB/T 18919-2002 The Reuse of Urban Recycling Water—Classified standard;AQSIQ,2002
2. GB/T 18920-2002, The Reuse of Urban Recycling Water—Water Quality Standard for Urban Miscellaneous Use;AQSIQ,2002
3. GB 20922-2007 The Reuse of Urban Recycling Water—Quality of Farmland Irrigation Water;AQSIQ,2007
4. GB/T 25499-2010 The Reuse of Urban Recycling Water—Water Quality Standard for Green Space Irrigation;AQSIQ,2010
5. GB / T 18920-2020 The Reuse of Urban Recycling Water—Water Quality Standard for Urban Miscellaneous Use;AQSIQ,2020