C
58

US Water Score: C

Seaford, NY 11783

Nassau County · Population served: 135,000 · Data updated July 2026

Service-area evidence: EPA service-area records associate the listed system with this ZIP. Boundaries may still overlap or change.

Water Systems Serving This Area

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LIBERTY UTILITIES NEW YORK - MERRICK
Groundwater · Pop. 135,000
PWSID: NY2902840

Contaminants Detected

ContaminantDetected LevelEPA MCLHealth GuidelineStatus
Lead
0.0
15 ppb 1 ppb Passed

Violation History (Last 5 Years)

27Total (5yr)
3Health-Based
24Major

Water Quality Summary

Understanding Your Water in Seaford

Tap water quality in Seaford, New York (11783) receives an overall grade of C (Mixed record-based signals) with a score of 58 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 28 points below the New York state average of 86. Compared to the national average (75), this area scores significantly lower. The area is served by Liberty Utilities New York - Merrick, a groundwater system providing water to approximately 135,000 people. Over the past 5 years, water systems here have accumulated 27 violations, including 3 health-based violations.

Your Score 58/100 C
vs State 28 pts below New York avg (86)
vs National 17 pts below national avg (75)

What a Grade C Means

A score of 58/100 indicates fair performance in the US Water Score model for Seaford, NY. The records show noteworthy concerns, such as elevated contaminant levels, violation history, or both. Review the detailed contaminant data and official utility reports before making decisions.

Groundwater: drawn from underground aquifers via wells

Health Information

What These Contaminants Mean for You

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Lead in Your Water

Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.

Health Effects

Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.

Common Sources

Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.

What You Can Do

If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.

Common Questions

Frequently Asked Questions

Seaford, New York receives an internal US Water Score grade of C (Fair) with a score of 58/100. Our model found some system-level concerns, such as violation history or elevated contaminant levels. Review your utility's Consumer Confidence Report and consult a qualified professional for household-specific health questions.

ZIP code 11783 is served by 1 water system using groundwater sources, providing water to approximately 135,000 people. Groundwater is naturally filtered through rock and soil, often requiring less treatment. However, it can be vulnerable to contamination from underground sources like naturally occurring arsenic, nitrates from agriculture, or PFAS from industrial sites.

Lead levels in Seaford, New York are 0.0 ppb, which is at or below the health guideline of 1 ppb. This is a positive result, though periodic testing is still recommended.

No PFAS ("forever chemicals") were detected in water systems serving Seaford, New York during the most recent EPA monitoring period (UCMR5). However, not all water systems have been tested for all PFAS compounds, and new contamination can occur over time.

Water systems serving Seaford, New York have received 27 violations in the last 5 years, including 3 health-based violations. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.

Water in Seaford, New York shows no major contaminant concerns based on available data. A basic carbon filter can improve taste and reduce chlorine. For extra peace of mind, an NSF-certified pitcher filter or faucet-mount filter provides an affordable layer of protection.

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