Appendix N - Definition of Potable Water Appendix N Definition of Potable Water All potable waters shall maintain and comply with the following maximum acceptable values for contaminants: Contaminants Maximum Acceptable Values Faecal coliforms < 1 CFU/100 mls of sample Turbidity 0.5 NTU In addition depending on source (e.g. surface water, roof water or bore water) the aesthetic water quality shall, as indicated, be determined with reference to the following guideline values for contaminants: Contaminants Guideline Value Ammonium (surface and bore water) < 1.5 milligrams per litre Hardness (surface and bore water) < (Ca+Mg) 200 milligrams per litre Iron (surface and bore water) < 0.2 milligrams per litre Lead (roof water) < 0.01 milligrams per litre Manganese (bore water) < 0.05 milligrams per litre Nitrate (surface and bore water) < 50 milligrams per litre pH (surface, roof and bore water) pH between 6.5 and 8.5 Non-compliance with the values for aesthetic water quality will not render water as "non-potable" for the purposes of this Plan. For values outside the recommended guidelines, water treatment is recommended. App N - 1