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Committee flags microplastics in slow‑release fertilizers as a potential local concern

Shelter Island Water Advisory Committee · May 18, 2026

Summary

Members heard that microplastics used in slow-release fertilizers may be an avoidable pollutant; the committee agreed to share a list of low- or no-microplastic products with landscapers and hardware stores and to keep the topic under review.

Committee members raised concerns that polymer microbeads in slow-release fertilizer products could contribute persistent microplastics to the local environment and suggested outreach to landscapers and hardware stores about alternatives. Andrew summarized the concern: "these microplastics are not necessarily going down through the soil into the aquifer, but... it seems like a pretty... potentially significant and unnecessary hazard." (Andrew, committee member).

Members noted that Sean had already emailed the island's landscapers with a list of products lacking microplastics and agreed to consider targeted educational messages for landscapers and retailers. The committee will continue to collect evidence on the significance of the issue locally before recommending regulatory steps.

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