Please you have to refer to ...
Published by Muna Hindiyeh, Associated Professor at German Jordanian University. Senior Water Quality Expert
Please you have to refer to your country standards for wastewater reuse for agriculture which include all parameters (biological, chemical, and heavy metals) with limits. Treated wastewater had to be compliant, it depend on what type of plants you want to use e.g. eaten raw vegetables or cooked, or used for parks or for the forests.