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Lead (1978) Designated Area Area/State/County Report
Lead (1978) Designated Area Area/State/County Report
Data is current as of November 30, 2025| Collin County, TX (Maintenance) | |
| TEXAS (Region VI) | |
| Collin County (P) | |
| Dakota County, MN (Maintenance) | |
| MINNESOTA (Region V) | |
| Dakota County (P) | |
| Douglas County (part); Portion of city of Omaha, NE (Maintenance) | |
| NEBRASKA (Region VII) | |
| Douglas County (P) | |
| Fayette County, TN (Maintenance) | |
| TENNESSEE (Region IV) | |
| Fayette County (P) | |
| Iron County (part); Dent Township, MO (Maintenance) | |
| MISSOURI (Region VII) | |
| Iron County (P) | |
| Within boundaries of Dent Township. | |
| Iron County (part); Liberty and Arcadia, MO (Maintenance) | |
| MISSOURI (Region VII) | |
| Iron County (P) | |
| Within boundaries of Liberty and Arcadia Townships. | |
| Jefferson County (part); Herculaneum, MO (Nonattainment) | |
| MISSOURI (Region VII) | |
| Jefferson County (P) | |
| Within city limits of Herculaneum. | |
| Jefferson County, AL (Maintenance) | |
| ALABAMA (Region IV) | |
| Jefferson County (P) | |
| Lewis & Clark County (part); City of East Helena and vicinity, MT (Maintenance) | |
| MONTANA (Region VIII) | |
| Lewis and Clark County (P) | |
| City of East Helena and vicinity. | |
| Marion County; Franklin Township, IN (Maintenance) | |
| INDIANA (Region V) | |
| Marion County (P) | |
| Muscogee County, GA (Maintenance) | |
| GEORGIA (Region IV) | |
| Muscogee County (P) | |
| Shelby County, TN (Maintenance) | |
| TENNESSEE (Region IV) | |
| Shelby County (P) | |
| Williamson County, TN (Maintenance) | |
| TENNESSEE (Region IV) | |
| Williamson County (P) | |
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