Drinking Water Storage Tank Cleaning Procedure

Office of ground water and drinking water standards and risk management division 1200 pennsylvania ave nw.

Drinking water storage tank cleaning procedure.

Proper maintenance of your drinking water holding tank will ensure that your drinking water is clean and safe to drink. Tank inspection and cleaning can be done by draining the water tank. Unless you re looking to get into the tank cleaning business you might consider leaving this project up to a professional. For drinking water storage tanks add 0 13 pounds 59 grams of dry calcium hypochlorite granules pellets or tablets broken or crushed to sizes not larger than 6 mm or 1 4 inch per 1 000 gallons 3785 liters of volume in the tank prior.

Industrial plants store water and chemical liquids in huge storage tanks. The underground storage tanks usts are preferred by gas. Generally they store the products in underground or above ground storage tanks. Storage tank cleaning procedure.

This document provides guidance for small water systems such as transient non transient non community and small community pws to properly care for their water. Whichever method is selected testing of the water according to american water works association awwa c652 is required except for coliform testing. Figure 3 1 presents the four step approach to cleaning and disinfecting water tanks. Aboveground storage tanks asts can be up to 300 feet in diameter and usually contain between 500 000 to 12 million gallons.

Select the tanks to use tanks should be selected based on. Disinfecting a potable water storage tank that is a tank used for storing drinking water in accordance with standards set by the american water works association awwa can be a difficult task. Use so that drinking water can be transported and stored safely. Cleaning disinfecting and flushing potable water storage tanks at small public water systems pws are important components of proving safe and clean drinking water to consumers.

Tanks used for potable water must be designed for liquid food or drinking water storage and can never have been used for sewage firefighting chemicals fuel or pesticides etc. Scrub all internal surfaces using a mixture of detergent and hot. This can be achieved by following the three steps below. Cleaning the tank the tank must be cleaned to ensure that water stored in the tank does not become contaminated by dirt or traces of the substance the tank previously held.

The city has instituted a tank cleaning program in which all tanks are cleaned on a. How to clean water storage tanks. The first step is to empty and clean the tank from the outside. Large quantities of clean water will be required to clean and treat tanks before they can be used to transport or store water.

Another option becoming more popular is using divers or remotely operated vehicles rovs. Cleaning and disinfecting water storage tanks and tankers world health organization step 1.