Name Sites Samples
Washington County 1 2
Washington County 6 43
Washington County 1 1
Washington County 4 6
Washington County 3 5
Washington County 1 19
Washington County 9 47
Washington County 2 6
Washington County 2 14
Washington County 1 2
Washington County 155 514
Washington Parish 1 2
Watauga County 5 23
Waukesha County 1 2
Wayne County 1 3
Wayne County 1 2
Wayne County 1 2
Wayne County 2 5
Weakley County 1 2
Webb County 12 112
Weber County 23 25
Webster Parish 1 5
Westchester County 5 58
Wharton County 3 6
Wheeler County 6 17
Wilcox County 2 2
Wilcox County 1 1
Wilkin County 1 1
Wilkinson County 2 19
Willacy County 4 11