WAEC SSCE Health Science
Study notes for Environmental Health — part of the WAEC SSCE Health Science syllabus. 5 learning objectives with explanations and exam tips.
Water supply refers to the system that brings clean, safe drinking water to homes and communities. It involves collecting water from sources like boreholes, wells, and treatment plants, then distributing it through pipes to where people live. Good water supply is essential because contaminated water causes diseases like cholera, typhoid, and dysentery that spread quickly in communities.
Nigeria faces serious water supply challenges, especially in rural areas. Many communities still rely on unsafe sources like stagnant ponds and untreated wells. Lagos State has invested in modern water distribution systems, yet many residents still struggle with irregular supply and water quality issues. The water must be treated by removing harmful bacteria, chemicals, and particles before it reaches your tap.
Government, NGOs, and private organizations work together to improve water access. When water supply systems work properly, they reduce waterborne diseases significantly and improve public health.
Waste disposal means getting rid of unwanted materials safely so they don't harm people or the environment. When we throw things away, they must go somewhere, and that somewhere matters a lot for our health.
In Lagos, the Lekki Conservation Centre shows how waste management should work—they separate waste properly and recycle materials instead of dumping everything together. This protects the soil and water from poisoning. Poor waste disposal causes diseases because bacteria and pests breed in rotting rubbish. Open dumps attract rats and mosquitoes that spread infections like cholera and malaria.
The best methods include burying biodegradable waste in designated areas, burning certain materials safely, and recycling plastics and metals. Composting organic waste from kitchens creates useful fertilizer. Every Nigerian community needs proper waste collection systems because what we throw away today affects our health tomorrow.
Refuse disposal means getting rid of waste materials safely so they don't harm our health or environment. When we throw away things like food scraps, plastic bags, old clothes, and broken items, we must handle them properly. Poor disposal causes serious problems like disease spread, water pollution, and pest infestations that affect whole communities.
Lagos State faces major refuse challenges because millions of people generate huge amounts of waste daily. When waste piles up on streets or gets dumped in rivers, it creates breeding grounds for mosquitoes and rats that carry diseases like malaria and typhoid. Good disposal methods include burying biodegradable waste, recycling materials where possible, and using designated waste collection points.
The best communities have organized waste management systems where refuse collectors visit regularly. This keeps streets clean and prevents environmental contamination that would otherwise sicken residents.
Sewage disposal means safely getting rid of human waste and dirty water from homes and communities. Think of it as the system that takes toilet waste, bathwater, and kitchen water away from where people live so it doesn't cause disease. When sewage isn't properly disposed of, it pollutes water sources and spreads diseases like cholera and typhoid fever.
Nigeria faces real challenges with sewage disposal, especially in places like Lagos where rapid population growth has strained the system. Many communities still use pit latrines or open defecation, which contaminates groundwater and spreads infections. Modern disposal methods include septic tanks, treatment plants, and sewers that safely transport waste to treatment facilities before releasing it into the environment.
Proper sewage disposal protects public health by preventing waterborne diseases and keeping our surroundings clean. It's one of the most important environmental health practices.
Good housing must meet certain standards to protect your health and wellbeing. The key criteria include adequate space so people aren't overcrowded, good ventilation to allow fresh air circulation and prevent diseases, and access to clean water and proper sanitation facilities. Your home should also have protection from environmental hazards like flooding, extreme weather, and pests.
Natural lighting through windows keeps your home healthy and reduces eye strain. The structure must be solid and safe, with proper roofing that doesn't leak. In Nigeria, many communities like Lagos Island have upgraded housing with these features, though informal settlements often lack them, leading to health problems.
Good housing also means having separate cooking areas to reduce smoke exposure and organized waste disposal systems. When a home meets these standards, residents experience fewer respiratory infections, waterborne diseases, and accidents.