Emissions of organic water pollutants are measured by biochemical oxygen demand, which refers to the amount of oxygen that bacteria in water will consume in breaking down waste. This is a standard water-treatment test for the presence of organic pollutants.
| Date | Value | Change, % |
|---|---|---|
| 2007 | 30,322 | 1.00% |
| 2006 | 30,022 | 1.06% |
| 2005 | 29,707 | 2.51% |
| 2004 | 28,981 | -1.85% |
| 2003 | 29,527 |
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