Jump To:
Please note: Oil typically bonds to itself and does not mix easily with water. In some instances, a bacteria sheen will look like oil. A simple test to tell the difference is to break the sheen by disturbing the material: Bacteria (to the left) will typically break into little platelets while oil (to the right) will reform to itself.
Types of Hydrocarbons
Petroleum Hydrocarbons
The most common hydrocarbon pollutant found in stormwater is petroleum based. These chemical compounds are commonly the result of accidental releases of oil or fuel from vehicles and machinery. Thousands of small fuel spills can accumulate to very high concentrations as they are collected and transported by stormwater to a receiving water. The best way to prevent this from happening is to implement preventative measures at the source before it happens. If you notice a drip or leak, fix it! If you see a small spill, clean it up!
Polycyclic Aromatic Hydrocarbons
Polycyclic Aromatic Hydrocarbons, or PAHs, are a form of hydrocarbons that occur during an incomplete combustion of a hydrocarbon. They are often found in substances such as coal-tar, a common ingredient in pavement sealant. Additionally, they can be found in industrial processes such as power generation, vehicle emissions, and various manufacturing activities.
PAHs are toxic and have been associated with a range of adverse effects, including causing cancer or mutation of genetic material. They are also known to accumulate in aquatic life, leading to potential impacts on aquatic ecosystems.