| Term | Definition |
| Groundwater | Water found in pourous rock layers underground |
| Confined Groundwater | Groundwater confined in between two impermeable layers |
| Water Budget | Balance showing the water available in different parts of the water cycle |
| Point Source | Untreated waste from easily identified points |
| Non-Point Source | Pollution spread over a wide area |
| Effluent | Materials that flow out of a pipe |
| Nutrient Enrichment | Accumulation of nutrients due to human intervention |
| Eutrophication | A result of nutrient enrichment |
| 80 Gallons | How much waste water the average american produces in one day |
| Human Waste, Soap, Paper | Materials Contained in Sewage |
| Primary Treatment | Removes ocly floating and settleable solids in sewage |
| Secondary Treatment | Bacteria Consume the organic parts of waste |
| Compost | A humus like material that can be used as a fertilizer |
| Watershed | Where water drains into a body of water |
| 1,000,000 | How many people in the US do not have acess to clean water |
| Indicator Species | Species that indicate presence of someone else |
| Hypoxic Zone | An area lacking of oxygen |
| Wetlands | Natural Protection against polluted water |
| Rain Garden | A garden to help filter out and stop polluted runoff |