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How do public-system records differ from a private well test in what they establish about arsenic?

The government data available for Arapahoe County reflect measurements from one well sampled multiple times over recent years. These results represent an area's aquifer condition, not the specific water from your household well or tap. Public records provide a useful regional snapshot but cannot determine your home's exact arsenic level. Only a test of your own water from a certified laboratory can achieve that.

What is the best order to rule out arsenic concerns before considering treatment?

Start with confirming whether your water source is from the regional aquifer sampled by the U.S. Geological Survey. Next, verify whether any obvious signs suggest arsenic presence, although these are typically not visible or detectable by taste or odor. Finally, collect a water sample and send it for certified laboratory analysis specifically for arsenic. This sequence helps avoid unnecessary equipment and focuses on accurate knowledge of your water.

What does a certified laboratory test for arsenic report, and how should I interpret it?

The laboratory will report the arsenic concentration in micrograms per liter (ug/L), often with a detection limit. Test results below the reporting limit mean arsenic was either not found or was below the detectable level. Positive detections give an actual measured concentration. These reports do not indicate violations or safety status by themselves but provide a basis for informed decisions.

What do 'detected,' 'median,' and 'range' mean in the arsenic sampling record for Arapahoe County?

In this area, arsenic was detected in 27 out of 60 samples from one well, with 33 samples falling below the reporting limit. The median arsenic concentration was 1.3 ug/L, with values ranging from 0.81 to 2.4 ug/L over the sampling period. These figures reflect measurements from the sampled aquifer and do not translate directly to any individual well. They show that arsenic is present in measured amounts but below all federal thresholds.

How do the sample depth, well depth, or water source type influence arsenic expectations in Arapahoe County?

Samples were taken from wells 26 feet deep, indicating a relatively shallow aquifer zone. Arsenic concentrations can vary with depth and geological factors, so deeper or different wells may have different profiles. Knowing your water source type and well depth will help predict if arsenic testing and filtration may be appropriate.

How does arsenic enter groundwater in the Arapahoe County aquifer?

Arsenic naturally occurs in some geological formations and can dissolve into groundwater over time. In Arapahoe County’s aquifer, this leaching process leads to detectable arsenic levels in sampled wells. Human activity does not appear to be the primary source according to available data. Understanding this natural origin clarifies why arsenic presence is common but usually below regulatory limits.

What options are available for arsenic treatment in households?

For households seeking technical solutions after confirming arsenic presence in their own water, systems like the Fleck Arsenic Filter ship ready to configure and are designed specifically for arsenic removal. Choosing such a system depends on accurate testing and understanding the arsenic level to address it effectively.

This page’s data come from 60 arsenic samples at one well in the Arapahoe County aquifer, collected from 2010 to 2025 by the U.S. Geological Survey. For detailed records, visit their official site.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2025-12-11. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.

On record: U.S. Geological Survey sampling of Arsenic in the aquifer (Arapahoe County): 60 results from 1 wells, median 1.3 ug/L, range 0.81-2.4 ug/L; none above any federal threshold