For Long Island pond owners, spring is the single most important season for water feature maintenance. After months of freezing temperatures, ice, and dormancy, your pond emerges from winter in a very different condition than it went in — and what you do in March and April can determine whether your koi have a healthy season or a struggling one.
Even in a well-maintained ecosystem pond, winter creates conditions that accumulate over time. Fallen leaves, dead plant material, and organic debris settle to the bottom and begin to decompose. This decomposition process consumes oxygen and releases ammonia and other compounds that are toxic to fish in high concentrations.
The beneficial bacteria living in your biological filter essentially go dormant below 50°F. Once temperatures rise and the bacteria wake back up, there's a brief window where your pond's chemistry is unstable — too much organic waste, too little bacterial processing capacity. This is when ammonia spikes are most dangerous.
A proper spring cleaning goes well beyond netting out leaves. At Scott Anderson Design, our spring cleaning process typically includes:
The result is a pond that looks like the day it was installed — crystal clear water, a healthy biological filter, and happy fish ready for the active season.
The right timing depends on water temperature, not the calendar date. We recommend scheduling your spring cleaning once pond water consistently stays above 50°F — typically mid-March through early May on Long Island. Too early and your fish are still in a cold-weather state; too late and ammonia levels may already be rising.
Our team serves pond owners throughout Nassau County — from Bellmore and Merrick to Oyster Bay and Great Neck. Spring booking slots fill quickly, so we recommend reaching out in late February or early March to lock in your preferred date.
Watch for these warning signs after winter: fish gasping at the surface, cloudy or green water that doesn't clear after a week, strong sulfur-like odors, or fish that seem lethargic or refuse to eat. Any of these indicate water quality problems that need professional attention.
Don't wait — contact Scott Anderson Design for a same-season assessment and cleaning. A healthy pond starts with a clean spring.
Pond cleaning pricing: Basic cleanings start at $500 for a small pond (7'x10') and $900 for a large pond (12'x14'). Deluxe cleanings with full drain and power wash start at $750.