Perquimans County Waterway Watch monitors water quality at five sites in the county, Location List. Water samples are sent to NCD. Ambient data is taken at each site of water collection, Current Data. Chemical measurements include total nitrogen (both organic and inorganic), phosphorus, potassium, calcium sodium, and various trace elements. On site data includes water temperature, pH, conductivity, salinity, turbidity, dissolved oxygen, and weather conditions. Historic data from Albemarle monitoring Stations are found on the Albemarle Water Quality Monitoring Map.