In other words, a sewage plant with excessively high nutrient levels in its discharges has to trim its levels to a specific concentration with its own equipment before it can buy credits to reach compliance with its state permit.
“We don’t set limits that we know are unachievable,” said Eleanor Ott, an environmental engineer with the Ecology Department.
One detail yet to be worked out would be whether a plant with excessive nutrient discharges can buy credits from any of the other 57 plants in the Puget Sound region, or whether it will be limited to buying credits solely from plants in the same bay or inlet.
In the meantime,
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