About: http://webisa.webdatacommons.org/71626080

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	supply by contaminants is difficult if the water supply is a pond, spring or other surface
http://www.w3.org/ns/prov#wasQuotedFrom	water-research.net