Across Cold Spring Harbor, New York, federal monitoring data has captured Nitrate in water samples at detectable concentrations in the most recent available reporting cycle.

Data: EPA SDWIS, CCR Reports, ECHO Last verified: 2026-05-14

Nitrate in Cold Spring Harbor Tap Water

Nitrate has been detected in Cold Spring Harbor, New York drinking water at a maximum level of 6.6 ppb — below the EPA MCL of 10 mg/L (as nitrogen).

This analysis covers 81,760 residents across 1 ZIP code in Cold Spring Harbor.

Cold Spring Harbor's overall water quality grade is C (65/100).

Is Nitrate in Cold Spring Harbor Water Safe?

Nitrate was detected in Cold Spring Harbor water but currently falls within EPA limits. However, some health organizations argue the EPA MCL may not be protective enough.

If you are concerned, a reverse osmosis or ion exchange filter can reduce nitrate levels further.

Nitrate Levels by ZIP Code

Average nitrate level across Cold Spring Harbor: 6.6 ppb

Health Effects of Nitrate

• Methemoglobinemia ("blue baby syndrome") in infants under 6 months
• Increased risk of colorectal and bladder cancer (long-term)
• Thyroid disease from chronic exposure
• Possible reproductive effects

Health risk severity: High. Governed by the National Primary Drinking Water Regulations.

How Nitrate Gets Into Drinking Water

• Agricultural fertilizer runoff
• Animal feedlot operations and manure
• Septic system leachate
• Urban stormwater and wastewater discharge

What to Do About Nitrate in Cold Spring Harbor Water

1. Reverse osmosis is the most effective method for nitrate removal
2. Ion exchange systems designed for nitrate can also work
3. Standard carbon filters do NOT remove nitrate
4. Boiling water increases nitrate concentration — never boil for nitrate

Look for filters certified under NSF 53 / NSF 58 for nitrate removal.

Related

• Nitrate — National Overview
• Nitrate in New York
• New York Water Quality
• Cold Spring Harbor Water Quality
• Check Your ZIP Code