As the demand for newer products rises, it creates a need for newer factories or the expansion of the already existing factories. With the expansion of factories or the installations of new factories the demand for septic tanks increases. In order to convince their customers the septic tank manufacturers are required to ensure their tanks are watertight. Currently the precast septic tanks are required for on-site water disposal or for more than 40 million homes in the United States. To make sure that the tank which is manufactured is completely watertight, the method known as the hatch cover ultrasonic tightness testing in the maritime industry is used.

The durability, strength, long life and the performance has made it a common choice for all the on-site installations in not only the United States but all over the world where a major building project takes place.  A pre-cast septic tank is made watertight through proper engineering and design. Since it has to hold many gallons of water; the pressure inside builds up; the high pressure can break the walls or create a leak if the manufacturing is not up to the mark. The designing process of the septic tank is not an easy task. There are many elements that can seriously harm a tank and make it useless. First of all the site where it needs to be installed is kept in mind. If the site where it will be installed is not very open, the tank would be not be designed in a wide body but it would be long and deep.

Another point that is needed to be under consideration when creating a pre-cast septic tank is the environmental conditions. If the tank is to be fitted in the winters, it needs to be able to survive cold temperatures. During the low temperatures or freezing temperatures, the tank is designed to be able to keep its insides warm. If the water inside it gets extremely to the low temperature, it can freeze and become a huge block of ice. This would damage the tank and possibly create a leak. In case there is a chance that the tank has developed a leak, it becomes necessary to check the leakage through the method commonly known as testing tightness of hatch with ultrasound. through this test the leak can be confirmed and the tank would either be replaced or repaired as per its condition.