Preventive measures Checking preventive measures Corrective action Causes What to check Signs that action is needed Event: CONTAMINATION ENTERS THE WATER AFTER TREATMENT – cont’d C1.8.4 Make sure only properly Inspection Cross-connections Employ a qualified people make of work. found. registered Illegal connections to the supply. plumber to to People who drink make the water the water get sick. connections OR supply. Water is make sure the discoloured, or person making tastes or smells the repairs is bad. properly trained. C1.8.5 Check the reticulation for Check the Check shows there Install devices places where water can supply for are places where to stop backflow Contaminants be sucked back into the places backflow may where they are are sucked drinking water if the where occur, but there is needed. into the supply pressure drops. backflow no device to prevent reticulation prevention it occurring. Where backflow is (“backflow”). is needed. possible, make sure that Water is one of the following is discoloured, or installed: tastes or smells bad. backflow-prevention device People who drink double check valve the water get sick. air gap. (Some places were these devices may be needed are: swimming pools; stock troughs; boilers; tanks used for preparing agrichemicals; school laboratories.) C1.8.6 Regularly inspect Check for Signs of damage to Repair or backflow prevention signs of a part of the supply. replace Vandalism or devices, and exposed damage. damaged sabotage. Water is pipes or valves. components. discoloured, or Where possible, provide tastes or smells Provide lockable enclosures for bad. protection to parts of the supply that stop future People who drink might be intentionally damage. the water get sick. damaged.
Causes Preventive measures Checking preventive measures Corrective action What to check Signs that action is needed Event: CONTAMINATION ENTERS THE WATER AFTER TREATMENT – cont’d C1.8.4 Illegal to the water supply. Make sure only properly qualified people make connections to the supply. Inspection of work. Cross-connections found. People who drink the water get sick. Water is discoloured, or tastes or smells bad. Employ a registered plumber to make connections OR make sure the person making the repairs is properly trained. C1.8.5 Contaminants are sucked into the reticulation (“backflow”). Check the reticulation for places where water can be sucked back into the drinking water if the supply pressure drops. Where backflow is possible, make sure that one of the following is installed: backflow-prevention device double check valve air gap. (Some places were these devices may be needed are: swimming pools; stock troughs; boilers; tanks used for preparing agrichemicals; school laboratories.) Check the supply for places where backflow prevention is needed. Check shows there are places where backflow may occur, but there is no device to prevent it occurring. Water is discoloured, or tastes or smells bad. People who drink the water get sick. Install devices to stop backflow where they are needed. C1.8.6 Vandalism or sabotage. Regularly inspect backflow prevention devices, and exposed pipes or valves. Where possible, provide lockable enclosures for parts of the supply that might be intentionally damaged. Check for signs of damage. Signs of damage to a part of the supply. Water is discoloured, or tastes or smells bad. People who drink the water get sick. Repair or replace damaged components. Provide protection to stop future damage.
example-small-rainwater-supply-feb14-v2.docx