Its Ohio River basin water-quality trading project will allow those facing high pollution-control costs to buy reduction credits from those whose costs are lower.
The realisation that the effects of land-use changes in the Thames catchment take more than 30 years to show themselves fully has profound implications for policies to monitor and manage the river's water quality.
But they said water from the river was safe, with water quality meeting government-set standards.
The project is intended to give the authorities the ability to draw water from the Colorado River for the Las Vegas area and guard against water quality issues that are associated with continually dropping lake levels.
Thames Water said the works at Abingdon would ensure the quality of the water in the River Thames was "exceptionally high".
The project, to be carried out by United Utilities, aims to upgrade the sewer network and improve the water quality of the River Lune.
In a letter to public attorneys general on Tuesday, the Arara tribe said that they were concerned about the quality of potable water derived from the Xingu River, an Amazon tributary.
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The judge said the council had decided not to order environmental assessments but, at the same time, had ordered water quality testing to ensure pollutants were not contaminating the river.
"This resulted in a 33km stretch of the brook, the River Cledan, the River Irfon and the Wye being polluted with silt, impacting on water quality, " said an agency spokesperson.
In 1972 the Clean Water Act further broadened the law, as Congress became concerned about pollution and water quality, spurred by high-profile incidents such as the Cuyahoga River catching fire in 1969.
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