Watershed Integrity Scores
*The above table represents a summary of data collected as part of the Environmental Integrity Index (EII)
- Since 1999, portions of Gilleland Creek have been listed on the State 303(d) List of Impaired Waterbodies for elevated bacteria and the State is continuing to assess the impairment through the Total Maximum Daily Load program.
- Portions of Gilleland Creek are listed on the State Water Quality Inventory as being of concern for ammonia and nitrate/nitrite enrichment.
- Wastewater effluent discharge and increasing residential development contributing to elevated nutrient, conductivity and solids concentrations.
- Gilleland has historically been impacted by agricultural activities, but is now experiencing more urban development.
- Increased nutrients alter biological communities and unnaturally maintain higher benthic macroinvertebrate diversity despite poorer water quality conditions.
- Bacteria sampling indicates elevated bacteria levels which may originate from both urban wastewater infrastructure and agricultural practices.