Definition of Sewage
Sewage refers to the wastewater that contains human or animal waste, along with other impurities such as soap, chemicals, and food particles. It is generated from households, industries, and other sources.

Harmful Effects of Discharging Untreated Sewage into Rivers or Seas
Discharging untreated sewage into rivers or seas can have several harmful effects on the environment, public health, and aquatic life. Some of the major reasons are:

1. Environmental Pollution - Sewage contains high levels of organic matter, nutrients, and pathogens that can pollute the water bodies. It can lead to the growth of harmful algae, depletion of oxygen, and degradation of aquatic habitats.

2. Public Health Risks - Sewage contains disease-causing microorganisms such as viruses, bacteria, and parasites that can pose serious health risks to humans and animals. Exposure to contaminated water can cause diarrhea, cholera, typhoid, and other illnesses.

3. Water Scarcity - Discharging untreated sewage into water bodies can also reduce the availability of freshwater resources. It can lead to the contamination of groundwater and surface water, making it unfit for human consumption and agricultural purposes.

4. Economic Losses - The pollution caused by sewage can have a significant impact on the tourism industry, fisheries, and other economic activities that depend on clean water resources. It can lead to job losses and economic losses for the communities.

Solutions to the Problem
To prevent the harmful effects of untreated sewage, it is important to adopt the following measures:

1. Proper Treatment - Sewage should be treated before discharge using effective treatment technologies such as activated sludge, oxidation ponds, and membrane filtration. This can help to remove the impurities and pathogens from the wastewater.

2. Recycling - Treated sewage can be recycled for agricultural purposes, industrial use, and non-potable applications. This can help to conserve freshwater resources and reduce the discharge of wastewater into the environment.

3. Public Awareness - Public awareness campaigns should be conducted to educate people about the harmful effects of sewage pollution and the importance of proper wastewater management practices.

4. Enforcement - Strict enforcement of regulations and penalties should be imposed on industries and individuals who violate the laws related to wastewater management.

In conclusion, discharging untreated sewage into rivers or seas can have severe consequences on the environment, public health, and the economy. It is important to treat and manage sewage properly to protect our water resources and ensure a sustainable future.

Sewage is the waste which is the waste of indrustries,school,offices etc. untreated sweage is so hramful because it pollute the sea and river its system is like we take a example indrestrial waste it direct contact with the river or sea it is harm the aqutic animals like fish etc.