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Q ST QUA TAT ALIT US O TY IN OF W N IN WA NDIA ATER A- 2 R ...

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Table-1.2Primary Water Quality Criteria for BathingCRITERIARATIONALEFaecal Coliform 500 (desirable) To ensure low sewage contamination. Faecal coliform andMPN/100ml : 2500 (Maximum faecal streptococci are considered as they reflect the bacterialPermissible)pathogenicity.Faecal Streptococci 100 (desirable)MPN/100ml : 500 (MaximumPermissible)The desirable and permissible limits are suggested to allow forfluctuation inenvironmental conditionssuch as seasonalchanges, changes in flow conditions etc.pH: Between 6.5-8.5 The range provides protection of the skin and delicate organslike eyes, nose, ears etc. which are directly exposed duringoutdoor bathing.Dissolved Oxygen: 5 mg/l or more The minmum dissolved oxygen concentration of 5 mg/l ensuresreasonable freedom from oxygen consuming organic pollutionimmediately U/s which is necessary for preventing productionof anaerobic gases (obnoxious gases) from sedimentsBiochemical Oxygen 3 mg/l or lessDemand 3 day, 27 o C:The Biochemical Oxygen Demand of 3 mg/l or less of thewater ensures reasonable freedom from oxygen demandingpollutants and prevent production of obnoxious gases.10

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