What are some common hazards associated with working on equipment in a sewer environment?
Working in a sewer environment can present various hazards to workers. Some common hazards associated with working on equipment in a sewer environment include:

Confined spaces: Sewer environments are often confined spaces, which can increase the risk of suffocation, oxygen deficiency, and exposure to toxic gases.

Electrical hazards: Sewer environments may contain live electrical equipment or exposed electrical wiring, which can cause electrocution or electrical burns.

Chemical hazards: Sewers may contain hazardous chemicals, such as gases and liquids that can cause skin irritation, respiratory problems, and other health issues.

Biological hazards: Sewer environments may contain harmful bacteria, viruses, and other microorganisms that can cause serious health problems.

Physical hazards: Working on equipment in a sewer environment can also present physical hazards, such as slips, trips, and falls, or injuries from moving equipment or debris.

To reduce the risk of these hazards, workers should follow proper safety protocols and receive proper training before entering and working in a sewer environment. Personal protective equipment, such as respirators, gloves, and protective clothing, should be used as necessary to minimize exposure to hazardous materials.
How many people per year die in sewer systems?
The number of people who die in sewer systems varies depending on the country and the specific circumstances. However, it is known that working in a sewer environment can be hazardous and potentially life-threatening if proper safety protocols are not followed. According to the US Bureau of Labor Statistics, there were 13 fatalities in the sewage and waste material treatment and disposal industry in 2019 in the United States. 

It is important to note that this figure may not include all incidents or fatalities that occur in sewer systems, as some incidents may not be reported or classified in this category. It is crucial for workers to prioritize safety measures and receive proper training and equipment to minimize the risk of injury or death in sewer environments.