Name Sites Samples
Salt Lake County 8 40
San Augustine County 3 3
San Miguel County 1 1
San Patricio County 12 52
San Saba County 3 12
Sanpete County 3 9
Santa Rosa County 6 12
Saratoga County 6 12
Saudi Arabia 1 1
Saunders County 2 3
Schenectady County 3 4
Schuyler County 2 12
Scioto County 9 30
Scott County 1 2
Scott County 4 18
Scott County 1 1
Screven County 6 16
Seminole County 3 4
Seminole County 1 2
Seneca County 8 31
Serbia 4 3
Sevier County 4 22
Sharkey County 5 14
Shawano County 1 0
Shawnee County 1 5
Shelby County 2 2
Shelby County 2 2
Shenandoah County 2 4
Sherburne County 2 3
Sheridan County 2 5