Dissolved oxygen (DO) is the amount of oxygen gas that is dissolved in water. It is an important water quality parameter. DO is crucial for the survival of aquatic life as it supports the respiration of fish and other organisms. The level of dissolved oxygen in water can vary depending on factors such as temperature, salinity, and the presence of photosynthetic organisms. Higher levels of dissolved oxygen are generally beneficial for aquatic life, while lower levels can indicate poor water quality and may lead to oxygen depletion and harm to aquatic organisms.

Well owners are advised to test the dissolved oxygen levels in their well water. Dissolved oxygen can impact the aquifer’s geochemistry and potentially alter water quality. By monitoring these levels, well owners can evaluate the likelihood of naturally occurring minerals dissolving into the groundwater, including minerals like arsenic. Regular dissolved oxygen testing contributes to ensuring the safety and quality of the well water supply.