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EPA Mandates Higher Oxygen Levels in Delaware River

10/8/2025

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Summary

Story summary

The Environmental Protection Agency (EPA) finalized a September 22 rule to raise oxygen in a 38-mile Delaware River stretch.
The standard requires 66% oxygen saturation, rising to 74% for juveniles.
Costs could reach $3 billion in Philadelphia alone, which the EPA disputes.
Groups, including Delaware Riverkeeper Network, back the change.
Delaware River Basin Commission ceded its role to the EPA.

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Story summary

The Environmental Protection Agency (EPA) finalized a September 22 rule to raise oxygen in a 38-mile Delaware River stretch.
The standard requires 66% oxygen saturation, rising to 74% for juveniles.
Costs could reach $3 billion in Philadelphia alone, which the EPA disputes.
Groups, including Delaware Riverkeeper Network, back the change.
Delaware River Basin Commission ceded its role to the EPA.