Terms : Hide Images
| 6032891285 | Primary sewage treatment | Physical step of sewage treatment filter out plastics and large items. (Required by CWA) | 0 | |
| 6032899896 | Secondary sewage treatment | Biological step of sewage treatment to break down organic matter in activated sludge tanks. (Required by CWA) | 1 | |
| 6032901526 | Tertiary sewage treatment | Optional treatment to remove excessive pollutants (O'Brian plant uses this to recover phosphorus and sell it as fertilizer) | 2 | |
| 6032901527 | Disinfection | Can kill disease-causing organisms with UV, chlorine, or ozone. | 3 | |
| 6032906540 | Soil erosion from farming | Can lead to an increase in turbidity in nearby streams | 4 | |
| 6032934600 | Acid mine drainage | Caused by exposed mining sites and can leach dangerous metals into nearby waterways | 5 | |
| 6032955765 | Externality | The health and environmental cost to society of a business causing water pollution (i.e. farmers creating Dead Zone in the Gulf of MX) | 6 | |
| 6033040072 | Septic system | A more natural design for processing wastewater from homes or businesses | 7 | |
| 6033084377 | Bioaccumulation | The process of a persistent pollutant (like DDT, PCBs, or mercury) building up in one organism's body since it doesn't get excreted. | 8 | |
| 6033084378 | Biomagnification | The process of a persistent pollutant (like DDT, PCBs, or mercury) increasing in concentration as you go up the food chain. | 9 | |
| 6033097585 | Endocrine disruptors (or hormonally active agents) | Chemicals like atrazine or BPA that mimic a hormone (like estrogen) and can have reproductive or other health impacts. | 10 | |
| 6033160932 | Corrosion of some plumbing pipes | Process that can cause lead to get into drinking water. | 11 |
