If an operator measures the dissolved oxygen in the Aerobic layer of the Wastewater Treatment Pond and records a reading of 8 mg/L, what is the reading in ppm?

Dissolved oxygen readings in water can be expressed in milligrams per liter (mg/L) and parts per million (ppm), and for water, these two units are equivalent. This is due to the density of water being approximately 1 mg/L = 1 ppm. Therefore, when an operator measures a dissolved oxygen level of 8 mg/L, this value is directly equivalent to 8 ppm. There is no need for conversion in this case, which confirms that the reading of 8 mg/L is the same as stating there are 8 ppm of dissolved oxygen in the aerobic layer of the wastewater treatment pond.