Name Sites Samples
Burnet County 1 1
Burundi 1 11
Caddo Parish 6 20
Caldwell County 5 36
Caldwell Parish 1 2
Calhoun County 1 1
Calhoun County 2 14
Calhoun County 2 8
Calhoun County 1 4
Calhoun County 10 37
Calumet County 2 4
Camden County 10 76
Camden County 1 8
Cameron County 3 4
Cameron County 3 2
Cameroon 1 6
Camp County 15 136
Campbell County 1 1
Canada 2950 9436
Canadian County 1 7
Cape Girardeau County 1 7
Carbon County 2 5
Carbon County 70 101
Carroll County 2 3
Carroll County 1 9
Carroll County 6 19
Carroll County 1 2
Carter County 1 4
Carteret County 4 14
Carver County 6 30