Comment on NY’s Draft Phosphorus Guidance Levels by 3/11/25

The New York State Department of Environmental Conservation (NYSDEC) has released draft quality guidance values for phosphorus in New York State surface waters. The draft values are available for public comment, and the deadline for comments has been extended until March 11, 2025. The comment period commenced on December 24, 2024. The values are intended to protect the drinking water and recreational waters of the State.

The public is encouraged to view and comment on the phosphorus guidance values. The draft values can be found on the NYSDEC website here, along with the details on how to comment on the new values. The draft values are tabled and vary depending on what Class and Water Type the water body is. Ponded waters have the lowest permissible levels, and drinking waters have lower permissible levels than fishing waters. Supporting documents are available on the NYSDEC site for those interested in further reading.

The Effects of Phosphorus

Phosphorus is known to cause reduced dissolved oxygen levels, increased turbidity, and the growth of algae within water bodies. It is a very harmful pollutant if in waterways in excessive amounts. Harmful Algal Blooms (HABs) are often the end result of uncurbed phosphorus in water bodies, and can be extremely detrimental to life within.

HABs may be visible in the water and look like foam, scum, or paint residue. They are likely to be blue/green in color, though they may also be brown, red, or purple. The odor of decaying plants may also indicate that HABs are present. The most common HAB is cyanobacteria, commonly known as blue-green algae. You can learn more about HABs here.

As Walden is staffed with water quality experts, if you need more information or if you require water testing, please give us a call at 516-559-6976.