Access to clean drinking water is essential for human health, national security, and economic prosperity. In wealthy countries such as the United States, clean water is readily available due to investment in water exploration, treatment, and sanitation. Regulation has limited industries and agricultural operations from discharging pollutants into lakes, river, and streams. Even still, water pollution in the US is a problem that threatens drinking water availability and water quality.
It is estimated that 1.2 trillion gallons of untreated sewage, groundwater, and industrial waste are discharged in the US each year resulting in 12 million to 18 million cases of water-borne diseases annually. In fact, 40% of rivers and 46% of lakes are polluted and not suitable for fishing, swimming or aquatic life. More than 73 different pesticides were found in US groundwater. If not for advanced water filtration and treatment technologies, these waters would result in widespread sickness and death.
In many developing countries people spend several hours each day to get water, and it is often polluted. Approximately 2.1 billion people globally lack access to safe drinking water and 4.5 billion people lack proper sanitation which only compounds the problem. In fact, 18% of the world’s population defecate in the open where it pollutes nearby water bodies and poses health risks. In developing countries, there are few government regulations or monitoring of water bodies. Consequently, 70% of industrial waste and 80% of sewage are dumped into waters, which then pollute the drinking water supply.
Because they lack adequate filtration and treatment, these populations are more likely to contract water-borne diseases. Contaminated water and poor sanitation are linked to spread of diseases such as cholera, diarrhea, dysentery, hepatitis A, typhoid, and polio. Table 1, found at the end of the lesson, lists the most common water-borne diseases and their health effects. On average 842,000 people (including 340,000 children under the age of five) die each year from diarrhea as a result of unsafe drinking water, sanitation, and poor hygiene.