| Austin, Texas | 65,640,000 |
| Round Rock, Texas | 16,996,468 |
| Rochester, N.Y. | 9,900,000 |
| Bullis School, Potomac, Md. | 3,400,000 |
| The Dalton School, New York City | 2,530,000 |
| Greenwich Academy, Greenwich, Conn. | 2,336,589 |
| Norwood School, Bethesda, Md. | 1,608,300 |
| Hotchkiss School, Lakeville, Conn. | 1,550,000 |
| Spirit Lake, Iowa | 1,500,855 |
| Kent Place School, Summit, N.J. | 1,100,000 |
| Source: U.S. Environmental Protection Agency | |
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