Swallows and Amazons and Beatrix Potter's Mrs Tiggy-Winkle), the North Kent Marshes (Charles Dickens's Great Expectations) and the River Pang. Water quality The Environment Agency measures the water quality of the river systems in England. Each is given an overall ecological status, which may be one of five levels: high, good, moderate, poor and bad. There are several components that are used to determine this, including biological status, which looks at the quantity and varieties of invertebrates, angiosperms and fish, and chemical status, which compares the concentrations of various chemicals against known safe concentrations. Chemical status is rated good or fail. Water quality of the River Pang in 2019: Etymology The river is named after a man, thought to be an early Saxon chieftain, or tribe called Pǣga who lived there in the post-Roman era. See also Tributaries of the River Thames List of rivers in England References Further reading External links Mapsources: source of the river and mouth Pang Valley Countryside Project Kennet & Pang Fisheries Action Plan Rivers of Berkshire West Berkshire District 1Pang