Dissolved oxygen concentration

{
  "id": "MLC-T-ENV-008238",
  "term": "Dissolved oxygen concentration",
  "field": "Environment",
  "definition": "Low Oxygen (oxygen depletion) levels in water can occur naturally for short periods, but when they are extreme or long-lasting, they can sicken and even kill fish and other aquatic life. When dissolved oxygen concentrations are less than 2 mg/L, the water lacks the amount of oxygen needed to sustain most aquatic life and is defined as hypoxic. Sewage wastewater, leaking septic tanks, algal blooms, farm and feedlot runoff, and stormwater runoff contain organic materials that decompose and use up oxygen in water. Higher water temperatures can lead to lower oxygen levels.",
  "subject": "Water",
  "references": [
    "How's My Waterway Glossary"
  ],
  "url": "https://mlchart.com/terminology/environment/dissolved-oxygen-concentration/"
}