Treated water has strong odour - Can this be used to water plants - What is least expensive method for treating the water ?

Hello,
We are a gated community of 30 houses in Hyderabad. We have a treatment plant where waste water (toilet and bathroom water) gets filtered through 5 chambers of gravel and the final product is visually crystal clear. However the water has a strong odour and we are not sure of bacteria content. We want to use this water for the lawn and garden in our park. Is this safe or does it have to go through another level of treatment, if so what is the least expensive method to get this done?

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