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A drainage system is a system that forms wastewater from various patterns such as streams, rivers, and lakes. The function of a drainage system goes beyond the removal of wastewater. During this time many deaths will occur due to sewer gases leakage from wastage.

Drainage systems must also be designed to prevent backflow, while keeping sewer gases away from indoor spaces. The expression “sewer gas” is utilized to portray the blend of gases discharged by sewage, and singular gases can be poisonous or non-harmful.

Many sewer gases are scentless, and the trademark smell when they break can be credited to hydrogen sulfide. This gas is likewise poisonous and combustible, which makes it risky in higher fixations. Once sewer gases can be smelled in a structure conditions could be hazardous or unsanitary. Since sewer gas contains methane gas (CH4) there is a danger of a blast peril or even deadly suffocation.

In addition, some writers opine that there are possible health hazards from sewer gas exposure, such as a bacterial infection of the sinuses (which can occur due to any sinus irritation). Contingent upon the sewer gas source and different factors, for example, mugginess and building and climate conditions, spores may form and may likewise be present in sewer gases.

In a little over a year, more than 20 workers have died in sewers. It affects human life and such workers put their lives at risk. This is because of the lack of adequate emergency facilities available in our country.

To improve this, there is a need to alert the emergency services to investigate the sewer gas leakage as soon as possible when the risk factor is high. That is, to find the risk level in the sewer gas leakage based on thresholding and give the alert once it exceeds it. With the help of IoT sensors, when the situation is abnormal, people’s lives can be saved. So, IoT-based sewer gas leakage detection and prevention is essential.

The Internet of Things (IoT) is an arrangement of interrelated computing gadgets, mechanical and digital machines, objects, animals or individuals that are given one kind of a identifier and the capacity to exchange information over a system without requiring human to human intervention. Using IoT technique, an automatic sewer gas leakage detection and prevention system can be built [10–23].