title: Are national water quality assessments threatened?
authors.forename: Kris
authors.initials: K
authors.lastname: Christen
mesh_terms: D003625:Data Collection; D004784:Environmental Monitoring; D005843:Geography; D005844:Geology / Q000706:statistics & numerical data*; D011786:Quality Control; D012016:Reference Values; D014481:United States; D014873:Water Pollutants / Q000032:analysis*; D014876:Water Pollution / Q000517:prevention & control
chemical_list: D014873:Water Pollutants