Environmental activists praise the new rule, which will improve the health of the river for fish. But wastewater-treatment utilities face millions in new costs to make it happen.

By Jon Hurdle

The federal government is raising the required oxygen level in an urban stretch of the Delaware River near Philadelphia to improve conditions for fish and humans, but the move faces pushback from wastewater utilities that will have to pay millions of dollars for infrastructure upgrades to comply with the new rule.

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