| Acronym | Meaning |
| POH | Purgeable Organic Halogen(s) |
| MST | Microbial Source Tracking |
| ETO | Elliptical-type Orbital |
| ISM | Interaction Site Model (in Statistical Mechanics Of Fluids) |
| TMWAM | Turkey-Mersey Watershed Acidification Model |
| BGH | Bovine Growth Hormone |
| ANC | Acid Neutralizing Capacity |
| LLS | Linear-least Squares |
| USDA | United States Department Of Agriculture |
| MDQ | Minimum Detectable Quantity |