Evaluation of the risks associated with the use of Rooftop Rainwater Harvesting and Groundwater for Domestic use and Livestock Watering (Volume 1) Microbial Quality of Rooftop Rainwater Evaluation of the risks associated with the use of Rooftop Rainwater Harvesting and Groundwater for Domestic use and Livestock Watering (Volume 1) Microbial Quality of Rooftop Rainwater Posted in .