Ee

California

Lower Co orado

Rio Grande

Shading indicates if there is a statistically significant difference between the basin's before- and after-CWA worst-case DO mean values.

^ Yes, a statistically significant difference ^ No, not a statistically significant difference ^ Insufficient data for analysis

New England

Middle Atlantic

Tennessee River o>

Figure 3-39 Statistical significance of the difference between before- and after-CWA worst-case DO mean values for the 18 major river basins in the 48 contiguous states. Source: USEPA STORET.

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