The acute effect of oil on birds, fish and microorganisms is well catalogued. The subtle effects of oil on other aquatic creatures are not as well understood and potentially more harmful. For example, anadromous fish such as salmon, which find their stream through the smell or taste of the water, can become so confused by the presence of strange hydrocarbons that they refuse to enter their spawning course. #UNEP #chemicals The acute damage caused by water pollution in China`s commercial fisheries is estimated at $634 million in one year Water pollution has many sources and causes, only a few of which are discussed here. Rivers and streams show some ability to recover from the effects of some pollutants, but lakes, bays, ponds, slow-moving rivers, and oceans have little resistance to the effects of water pollution. We have a long history of introducing pollutants into the aquatic environment and have had only partial success in repairing the damage already done and reducing activities that lead to environmental degradation. Pollution from diffuse sources continues to pose a serious threat to water bodies, as does the continued discharge of sewage and industrial wastewater worldwide. As we have seen with mercury contamination of fish, pollution can have profound and lasting consequences. Water pollution is the addition of harmful chemicals to clean water. Heat is also an industrial waste that is released into water; Heated runoff can drastically change the ecology of a stream or lake. Although local warming can have positive effects, such as: freeing the ports of ice, the main effect is harmful: reducing the solubility of oxygen in water, because the solubility of gases in water is inversely proportional to temperature, thus reducing the amount of dissolved oxygen (DO) available to gill-breathing species. As DO levels decrease, the metabolic activity of aerobic aquatic organisms increases, increasing oxygen demand. The PFAS-laden fire extinguishing foam used in training exercises at military bases easily slips into the groundwater supply, contaminating everything around it.
Nevertheless, we are not desperate in the face of the threat to drinking water. To better understand the problem and what we can do about it, here`s a look at what water pollution is, what causes it, and how we can protect ourselves. Water pollution is not a new phenomenon. For example, as early as 1868, the Cuyahoga River in Cleveland, Ohio, represented several instances of fire risk due to pollution such as debris and oil spills. Although there are other cases of river pollution, the Cuyahoga is the best known. Federal water legislation began when Congress enacted the River and Harbor Act of 1886, which was recoded into the Rivers and Harbors Act of 1899. The Federal Water Protection Act is a comprehensive law aimed at restoring and maintaining the chemical, physical and biological integrity of the country`s water. It was originally promulgated in 1948. In 1952, the oil spill and debris that polluted the Cuyahoga River caught fire and caused more than $1 million in damage. Amendments to the Water Pollution Control Act of 1956 were then passed to strengthen enforcement by eliminating the need for the federal government to obtain state approval. The Water Quality Act of 1965 (Public Law 89-234) provided for the establishment of enforceable water quality standards and the basis for interstate water quality standards. The Clean Water Restoration Act of 1966 (Public Law 89-753) imposed fines ($100 per day) on polluters who failed to provide the required report.
On June 29, 1969, debris from the Cuyahoga River caught fire. This event became a major national news event when Time magazine published an article describing the river not only as a fire hazard, but also as « without visible life, not even with low forms such as leeches and mudworms that usually thrive on trash » and that « ooze rather than flow » due to heavy pollution. In the Philippines, Republic Act 9275, also known as the Philippine Clean Water Act of 2004, is the current wastewater management law. The country`s policy is to protect, preserve and revive the quality of its fresh, brackish and marine waters, for which wastewater management plays a special role.  Acid mine drainage has polluted surface water since ore extraction began. Sulphurous water escapes from mines, including old and abandoned mines, as well as active mines, and contains sulphur compounds that oxidize to sulphuric acid on contact with air. The resulting acidity of the stream or lake into which this water flows is often high enough to kill the aquatic ecosystem. In addition, water pollution also causes serious environmental damage.
Water pollution can cause eutrophication, in which the algae population explodes and deprives other marine life of vital nutrients. Water pollution can also directly kill large numbers of wild animals by being poisoned by toxic substances such as mercury or physical damage caused by debris such as plastics and other waste. Of course, toxic substances also pose a serious risk to human health. Water pollution is defined as any chemical or physical alteration of water that is harmful to living organisms. Point source pollution comes mainly from industrial facilities and municipal wastewater treatment plants. The range of pollutants is enormous and depends only on what is « thrown down the drain ». This widespread problem of water pollution endangers our health. Unsafe water kills more people each year than war and all other forms of violence combined. Meanwhile, our drinking water sources are limited: less than 1% of the Earth`s fresh water is actually accessible to us. If left unchecked, the challenges will only increase by 2050, when global demand for freshwater is expected to be one-third higher than it is today. The transition to a holistic approach to chemical contamination combines the following approaches: integrated control measures, transboundary considerations, complementary and complementary control measures, life-cycle considerations, effects of chemical mixtures.  Organic substances entering water bodies are often toxic.
: 229 According to the United Nations, more than 80% of the world`s wastewater returns to the environment without being treated or reused; In some least developed countries, the figure is over 95 per cent. In the United States, wastewater treatment plants treat about 34 billion gallons of wastewater per day. These plants reduce the amount of pollutants such as pathogens, phosphorus and nitrogen in wastewater, as well as heavy metals and toxic chemicals in industrial waste, before discharging the treated water into the water. Then everything goes well. But according to EPA estimates, our nation`s aging and slightly overwhelmed wastewater treatment systems also release more than 850 billion gallons of untreated wastewater each year. A growing number of communities – coastal and inland – are underwater. Extreme weather, rising sea levels and other impacts of climate change are increasingly responsible. Here`s a look at what connects floods and our warming world. Erosion due to deforestation and changes in hydrology (soil loss due to water runoff) also leads to sediment loss and possibly water pollution.
  In many parts of the world, groundwater pollution poses a threat to the well-being of people and ecosystems. A quarter of the world`s population depends on groundwater for drinking, but concentrated loading is known to transport short-lived pollutants into carbonate aquifers and threaten the purity of those waters.  Ugly, foul-smelling and sometimes toxic algal blooms are increasingly common in freshwater ecosystems such as rivers, lakes, ponds and reservoirs. Here`s a look at how excess algae can affect the environment and human health. Solid waste can enter water bodies through untreated sewage, combined sewer overflows, urban runoff, people discharging waste into the environment, wind carrying municipal waste from landfills, etc. This leads to macroscopic pollution – large visible objects that pollute water – but also to microplastic pollution that is not directly visible. The terms marine litter and marine plastic pollution are used in relation to ocean pollution. Radioactive waste is any pollution that emits radiation beyond what is naturally released by the environment. It is produced by uranium mining, nuclear power plants and the production and testing of military weapons, as well as by universities and hospitals that use radioactive materials for research and medicine. Radioactive waste can remain in the environment for thousands of years, making disposal a major challenge.