Name Sites Samples
Woodward County 3 5
Wright County 1 2
Wyoming County 4 68
Wythe County 2 3
Yadkin County 2 7
Yalobusha County 2 6
Yazoo County 2 14
Yell County 2 4
Yellow Medicine County 1 4
York County 2 18
York County 1 9
Young County 1 41
Zapata County 5 53
Zavala County 10 37
Ziebach County 1 2
Ă…land Islands 1 6