Some of these following reference could help you. WHO Guidelines for drinking-water http://www.who.int/water_sanitation_health/dwq/guidelines/en/ Effluent Limitation Guidelines by EPA http://water.epa.gov/scitech/wastetech/guide/ Safe use of wastewater, excreta and greywater http://www.who.int/water_sanitation_health/wastewater/en/

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Some of these following reference could help you.
WHO Guidelines for drinking-water http://www.who.int/water_sanitation_health/dwq/guidelines/en/

Effluent Limitation Guidelines by EPA http://water.epa.gov/scitech/wastetech/guide/

Safe use of wastewater, excreta and greywater http://www.who.int/water_sanitation_health/wastewater/en/