DPW outlines phosphorus-control obligations and retrofit costs for Newton’s stormwater system Department of Public Works staff briefed the committee on the city’s NPDES/MS4 obligations, phosphorus-control plan (TMDL) for the Charles River and an initial retrofit/capital agenda. Officials said the city must cut phosphorus discharges by about 63% under EPA targets and presented multi‑year costs and interim milestones; staff said a detailed 20

Newton is facing a monumental challenge to slash phosphorus discharges by 63% to protect the Charles River, but the projected costs could skyrocket into the hundreds of millions.

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