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Low-Cost Septic Retrofit Promises Major Nitrogen Reduction

12/29/2025

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Summary

Story summary

Researchers at Stony Brook University have developed a low-cost retrofit for aging septic systems on Long Island that converts existing tanks into multiple chambers and can be installed through a manhole, using wood chips to enhance nitrogen removal.
Lead researcher Thomas Varley notes the system consistently tests below 10 milligrams of nitrogen per liter, outperforming current standards.
With 360,000 homes in Suffolk County relying on septic tanks, widespread adoption could significantly decrease nitrogen levels.
County Executive Ed Romaine expressed openness to discussing grants for implementing this technology.

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Story summary

Researchers at Stony Brook University have developed a low-cost retrofit for aging septic systems on Long Island that converts existing tanks into multiple chambers and can be installed through a manhole, using wood chips to enhance nitrogen removal.
Lead researcher Thomas Varley notes the system consistently tests below 10 milligrams of nitrogen per liter, outperforming current standards.
With 360,000 homes in Suffolk County relying on septic tanks, widespread adoption could significantly decrease nitrogen levels.
County Executive Ed Romaine expressed openness to discussing grants for implementing this technology.