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Graphing Water Quality Data

    Directions for Graphing Water      Quality
     Samples of Water Quality Graphs

Pollutant and Water Quality     Information
     Dissolved Oxygen
     Fecal Coliform
     Methyl-t-betyl Ether
     Turbidity & Sedimentation

Water Testing

     Fecal Coliform
     Dissolved Oxygen
     Company Websites


Sample Water Quality Graphs

Provided below are sample graphs created using the STORET Warehouse data of ammonia, fecal coliform, and phosphorous at various locations of the Haw River and its tributaries. Explanations for water quality standards are provided below each graph.

Nitrogen, ammonia (NH 3), is very toxic to fish and other aquatic organisms. At 0.06 milligrams of ammonia per liter water (mg/L), fish can suffer gill damage. When levels increase to about 0.2mg/L fih such as trout begin to die, and when ammonia levels reach 2.0 mg/L fish that are more tolerant to ammonia begin to die. An ammonia level of 0.01 mg/L indicates polluted water. If you look at the above graph almost all of the points are above 0.01 mg/L indicating that the Haw River is polluted.


The presence of fecal coliform in water indicated the presence of human or animal waste. North Carolina water quality standards state that fecal coliform counts that exceed a geometeric mean of 200/100 ml from at least 5 samples during a 30 day period are contaminated. Furthermore fecal coliform is not to exceed 400/100 ml in more than 20 percent of the samples tested during those 30 days. The above graph indicates that there are multiple points which exceed both divisions of the fecal coliform standards.


Phosphorous enters the water from fertilization of residential, agricultural, and commerical lands as well as other chemicals used for crop management. The maximum phosphorus level that should be found in the water is 0.1 mg/L. However, if you notice on the above graph all points are above the 0.1 mark.