Introduction: Rainwater runoff, also called a nonpoint source, is everywhere, especially in the man-made concrete communities in which we live. Rainwater runoff occurs after rain showers and thunderstorms, when water runs down streets, sidewalks, and gutters. There is so much rainwater runoff every day because of the huge neighborhoods, buildings, and parking lots we create. Runoff occurs when water cannot penetrate the ground, as it does naturally. With the growth of cities and industrialization, stormwater runoff is becoming more and more of a problem and people need to start worrying about it. Runoff can become very dangerous, depending on what it carries with it. Pesticides, trash, bacteria, road sediment, feces, and oil/gasoline are just a few of the many substances that stormwater runoff carries with it on its journey; and let's not forget all the possible toxic chemicals that would fall in its path. Many homes have been built, causing more runoff because it is not absorbed by the ground, since it is covered with concrete or other substances used to build. Anything that sits in the gutters also goes down into the ground and into drains which discharge water into the ground or other bodies of water, and the effects can be both positive and negative. Substances such as phosphate can move with runoff into areas covered with dirt and grass, leading to faster growth. While some people may think that fast-growing grass is helpful, let's not forget the rest of the environment that phosphate can affect. Some algae can be harmful to humans when ingested. After learning this, people should realize that it is time for environmental management to move to middle of paper....the waters are not very suitable for drinking water, but they might be suitable for human life plants and animals. with. The pH level of sample one and sample two of runoff water was eight and a half. Tests performed on sample one and sample two of runoff water contained a very high nitrate content, around ten and a half. The phosphate levels of the first and second sample were approximately 10 and a half. Conclusion: Phosphate levels found in rainwater runoff in the environment can be very harmful to humans, but not to plants. Phosphate helps plants, grass and algae grow and some plants and algae are harmful. But at the same time excess phosphate means excess algae and excess algae decreases dissolved oxygen levels and if dissolved oxygen levels decrease many fish and aquatic animals cannot survive leaving the environment with plants but no animals..