Appendix D

Sources of Impairment in Assessed Arizona Perennial Lakes

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Basin                | Acres Assessed  | Acres Impaired  | TDS      | Natural  | Agricultural  | Hydromodify  | Urban Recreation  | Landfill   | Landfill  | Point Source  | Extraction  | Resource Unknown  |
================================================================================================================================================================================================================
| Bill Williams        |   13,501        |  5,015          |  5,015   | 5,000    | 5,000         | 50,00        | 0                 | 0          | 0         | 0             | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Colorado             | 48,523          | 28,379          | 19,909   | 19,188   | 19,218        | 15,138       | 1,488             | 1,569      | 0         | 0             | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Little Colorado      | 13,362          | 2,705           | 2,705    | NA       | NA            | NA           | 0                 | 0          | 0         | 0             | NA          | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Lower Gila           | 964             | 170             | 170      | 0        | 170           | 170          | 170               | 0          | 0         | 170           | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Middle Gila          | 59,632          | 1,932           | 1,918    | 1,541    | 1,740         | 255          | 0                 | 0          | 200       | 200           | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Upper Gila           | 612             | 117             | 117      | 0        | 85            | 42           | 0                 | 32         | 0         | 75            | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Salt                 | 24,297          | 14,353          | 14,353   | 14,253   | 13,158        | 1,195        | 0                 | 0          | 0         | 50            | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| San Pedro            | 602             | 0               | 0        | 0        | 0             | 0            | 0                 | 0          | 0         | 0             | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Santa Cruz           | 4,469           | 442             | 442      | 12       | 45            | 0            | 7                 | 12         | 0         | 12            | 0           | 25                |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Verde                | 6,322           | 2,067           | 2,067    | 2,015    | 11            | 41           | 0                 | 0          | 0         | 0             | 0           | 0                 |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Total Acres          | 172,284         | 55,180          | 46,696   | 42,009   | 39,427        | 21,841       | 1,715             | 1,613      | 200       | 507           | 0           | 125               |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| Percent of Impaired  | 85              | 95              | 90       | 50       | 4             | 4            | 0.4               | 1          | 0.3       |               |             |                   |
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------