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Understanding Government Data on Lead in Hempstead Water

Public Water System Records Indicate Zero Lead at 90th Percentile

The EPA’s sampling of the Liberty Utilities New York - Merrick public water system, which serves Hempstead, Nassau County, recorded a lead 90th percentile concentration of 0 mg/L as of mid-2025. This distribution measure reflects lead levels after water passes through household plumbing for many connections but does not represent source water quality or individual residences.

Presence of Health-Based Violations Does Not Directly Imply Lead Issues

Though the system has three EPA health-based violations on record, lead was not among the detected contaminants at concerning levels. These violations relate to other matters and do not confirm lead concerns within your home's water.

Sequence of Steps to Narrow Down Lead Issues

1. Check for Plumbing Materials Known to Contain Lead

Older homes may have lead pipes or solder, which can contribute to lead levels regardless of public water system results.

2. Observe Water Appearance and Taste

Though lead is tasteless and colorless, changes in taste or discoloration may signal plumbing corrosion that could release lead.

3. Perform Specific Laboratory Testing at Your Residence

Only a certified laboratory test analyzing water from your tap can confirm lead levels unique to your household.

Fixtures and Processes Most Vulnerable to Lead Exposure

Kitchen and Bathroom Faucets

Lead can leach into water when it stagnates in pipes, so faucets used frequently and those rarely used can show different lead concentrations.

Ice Makers and Drinking Water Dispensers

These fixtures are directly connected to water consumed and should be monitored if lead is suspected.

How Water Source Characteristics Affect Lead Expectations

Groundwater as the Source

Hempstead’s groundwater source typically contains low lead concentrations; however, plumbing materials primarily influence household lead levels.

Sample Depth and Plumbing Influence

Lead presence is more a factor of plumbing composition and water stagnation than source depth or type.

Information to Record Before Exploring Treatment Options

Document Age and Type of Plumbing

Identify whether any pipes, fittings, or solder are known to contain lead.

Note Any Taste, Color, or Odor Changes

Record these observations to help discern potential corrosion or contamination influences.

Gather Recent Laboratory Test Results

Have certified lab reports ready to better assess your water quality and treatment needs.

Reading Certified Laboratory Lead Test Results

Concentration Units and Reporting Limits

Lead test reports typically present concentration in milligrams per liter (mg/L). Levels greater than zero indicate detected lead, but interpretations depend on guidelines.

Interpreting Lead Presence

Any lead detection should be understood in context, as presence does not necessarily mean exceedance of health-based standards.

In summary, Hempstead’s public water system records show no significant lead at the distribution level, meaning concerns primarily arise from household plumbing. Begin by ruling out plumbing sources and perform certified testing to identify your home’s specific lead situation. For treatment, consider the Autotrol Lead in Water Filter, which ships ready to configure and addresses lead effectively after your evaluation.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2025-06-30. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA SDWIS record for LIBERTY UTILITIES NEW YORK - MERRICK (NY2902840), groundwater supply, serving 135000 people: 3 health-based violations of 65 total; lead 90th percentile 0 mg/L