Reservoir Cleaning Services

Methods for Cleaning and Disinfecting Reservoirs

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The American Water Works Association (AWWA) outlines standard procedures for disinfecting water storage facilities to ensure safety and effective bacteriological testing results.

• Method 1: Fill the tank to the overflow level with potable water and add chlorine to achieve a free chlorine residual of at least 10 mg/L over a retention period of 6 to 24 hours. After confirming a safe chlorine residual, the facility is emptied, refilled, and bacteriological testing is conducted before water can be distributed.
• Method 2: Apply a 200 mg/L chlorine solution to all interior surfaces of the emptied and cleaned reservoir, including walls, hatches, and piping. The solution must remain in contact for at least 30 minutes before refilling with potable water to the overflow level. Bacteriological testing must be passed before distribution.
• ‍Method 3: Add water and chlorine to achieve an initial concentration of at least 50 mg/L available chlorine, filling about 5% of the total volume. Maintain this solution for a minimum of 6 hours, then refill to the overflow level. A minimum 24-hour retention period with at least 2 mg/L free chlorine is required, followed by purging highly chlorinated water from the drain. Bacteriological testing must be passed before distributing the water.