Fleck Lead in Water Filter

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If your water source is surface water in Adams County, what lead levels should you expect?

The lead concentration reported by the US EPA for the public water system serving Adams County, specifically Thornton City, is based on distribution system sampling rather than the raw surface water source. The latest public record shows the 90th percentile lead concentration as 0.0023 milligrams per liter. This figure reflects lead potentially introduced after water leaves the treatment plant, often from home plumbing materials or distribution pipes, rather than directly from the natural surface water supply.

If only a small number of samples represent your water system, what does that tell you?

EPA sampling involves collecting water from numerous household taps connected to the public system to assess lead levels. For Thornton City, thousands of connections serve over 226,000 people. The 90th percentile statistic summarizes the distribution of lead measurements across these samples, meaning 90% of the sampled sites had lead levels at or below 0.0023 mg/L. However, individual household lead levels can vary due to plumbing differences. Thus, a small number of samples would provide less comprehensive insight, but the public system’s record is based on extensive sampling.

If lead presence in household water remains untreated for years, what outcomes might occur?

Lead exposure through drinking water can accumulate over time, potentially contributing to health concerns that are especially significant for children and pregnant individuals. The EPA's regulations and water treatment processes aim to minimize lead levels entering homes. Untreated lead in water can cause plumbing corrosion and, consequently, increased lead release. Addressing the issue proactively helps preserve water quality and supports long-term health safeguards.

If you compare Adams County’s lead water data with a neighboring county, what should you keep in mind?

While nearby counties may have different environmental and infrastructural factors influencing water quality, their lead level results are not directly transferable to your own household. Each public water system has unique water sources, treatments, and pipe conditions. Comparisons should be made cautiously, focusing on overarching trends rather than assuming similarity. For Adams County’s Thornton City system, with no health-based violations recorded, the data indicate effective lead management under current EPA guidelines.

If terms like ‘detected,’ ‘median,’ and ‘range’ appear in your water report, what do they signify?

In EPA sampling reports, 'detected' means an instrument measured lead at some level; it is not a statement of safety or violation. 'Median' is the middle measurement among tested samples, and 'range' indicates the spread between lowest and highest detected values. For Adams County’s system, the 90th percentile value of 0.0023 mg/L shows that most samples fall well below the EPA action level for lead, reflecting well-managed water quality rather than a health concern.

To understand lead levels specific to your household, testing your tap water is necessary since public system figures reflect aggregate data and distribution influences. For households deciding between technical approaches to reduce lead, a Fleck Lead in Water Filter can be a direct-purchase option. This system ships ready to configure and is designed to address lead concentrations consistent with the demand figures measured in your own water testing.

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 THORNTON CITY OF (CO0101150), surface water supply, serving 226465 people: 0 health-based violations of 8 total; lead 90th percentile 0.0023 mg/L