Understanding Lead in Washington County Water: Seasonal and Household Variations

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Lead Levels in Washington County Vary Over Time, But Stay Well Within Health Standards

Many people wonder if lead concentrations in their water fluctuate with the seasons or across multiple years. According to the EPA's Safe Drinking Water Information System, sampling from the Fayetteville Waterworks public water system serving Washington County, AR, shows a lead 90th percentile of 0.001 mg/L as of December 31, 2025. This measurement summarizes lead presence in household plumbing across the system but is not a direct sample of the source water.

The record indicates no health-based violations related to lead have ever been recorded at Fayetteville Waterworks. This stability over time suggests seasonal or annual variation in lead levels within the system is minimal, rather than sharply changing.

What the Median and Range for Lead Mean for a Typical Home

Interpreting the 90th percentile figure helps homeowners understand their possible exposure but does not indicate a specific lead level in their tap water. The 90th percentile means that 90% of tested locations have lead at or below 0.001 mg/L. This value is based on sampling within household plumbing rather than source supply. A home's actual lead levels depend on its internal pipes and fixtures rather than the system-wide averages.

Comparing Washington County to Nearby Water Systems: What It Does and Does Not Show

While Washington County's Fayetteville Waterworks record shows no lead violations and very low percentile values, neighboring counties may have differing figures due to source water, infrastructure age, or treatment methods. However, differences between systems do not establish any particular home's water quality. Each household's lead situation results from its own plumbing and internal conditions, so government records serve as background context, not personal test results.

How Household Size and Property Use Affect Lead Considerations

Larger households, second homes, or seasonal properties in Washington County may experience different water usage patterns that influence lead release risk. For example, water standing in pipes for extended periods in a seasonal property can increase lead leaching from plumbing materials. Therefore, sampling and treatment choices should consider water use frequency and stagnation time as much as systemic lead levels.

Source Type and Sampling Depth Influence the Interpretation of Lead Data

Fayetteville Waterworks uses surface water supply, which generally contains no detectable lead, so lead measurements arise mainly from plumbing materials in distribution. Conversely, well depths or source types like groundwater can affect lead presence differently, so comparisons or expectations must factor in these distinctions. Moreover, sample points inside homes measure plumbing-related lead, not source water concentrations.

What You Should Not Conclude From Washington County Data

The low lead 90th percentile recorded by Fayetteville Waterworks does not guarantee any individual home's water is free of lead. It also does not indicate a violation or unsafe condition for anyone served by this public system. To understand your household's lead status, conducting a specific water test at your tap is necessary. From there, selecting appropriate equipment that reduces lead exposure—such as the Fleck Lead in Water Filter, which ships ready to configure—can address your concerns effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2025-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA SDWIS record for FAYETTEVILLE WATERWORKS (AR0000569), surface water supply, serving 116398 people: 0 health-based violations of 0 total; lead 90th percentile 0.001 mg/L