Pentair Nitrate & Nitrite (Well) Filter

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What Do the Recorded Nitrate Levels in El Paso County Aquifer 111ALVM Indicate About Safety?

Groundwater sampling from 51 wells in El Paso County’s aquifer 111ALVM, conducted by the U.S. Geological Survey, shows nitrate measurements ranging from 0.046 to 218.0 mg/L, with a median of 10.2 mg/L in 388 samples taken between 2010 and 2025. The federal maximum contaminant level (MCL) for nitrate in drinking water is 10.0 mg/L, which is a health-based threshold used to assess water quality.

However, these measurements reflect regional sampling results, not your specific household water. Detecting nitrate does not necessarily mean that any one well or tap water exceeds this standard or is unsafe. Only an individual water test can establish your household’s nitrate concentration. The presence of results above the MCL in the regional data indicates that some wells in this aquifer have elevated nitrate, but it does not directly predict your water quality.

How Should I Understand the Median and Range of Nitrate Concentration as a Homeowner?

The median nitrate concentration of 10.2 mg/L means half the sampled measurements were above this number and half were below. Since this median slightly exceeds the federal MCL, it indicates that elevated nitrate in groundwater is not uncommon in this area.

The range from very low (0.046 mg/L) to very high (218.0 mg/L) values shows variability likely influenced by factors such as well depth (16 to 215 feet), land use, and seasonal or yearly changes. This data range helps homeowners understand that nitrate levels can differ widely among wells. To know where your household water fits within this range, testing your well water specifically is essential.

What Household Water Issues May Be Related to Elevated Nitrate Concentrations?

Nitrate itself is colorless and odorless, so it cannot be detected through smell or appearance. Common indicators such as unusual taste or staining are not caused by nitrate. Elevated nitrate poses a particular health risk to infants and pregnant women as it can affect oxygen transport in the blood. Households with young children or expectant mothers should be especially attentive to nitrate levels.

If you experience health-related concerns or if sensitive household members are present, confirming nitrate levels via testing is important. Symptoms attributable to nitrates are not visible in usual water use and require laboratory analysis.

How Often Does the Pentair Nitrate & Nitrite (Well) Filter Need Maintenance?

This filter system ships ready to configure for your household water supply. Its maintenance rhythm depends on factors such as nitrate concentration and household water usage. Typically, components that address nitrate control will require periodic service to maintain performance, which may include filter media replacement or system cleaning at intervals recommended in system guidelines.

Keeping to a maintenance schedule ensures the filter continues reducing nitrate effectively. Regular attention to operational status helps avoid performance decline without the need for external service calls.

What Do Terms Like "Detected," "Median," and "Range" Mean in This Nitrate Data?

In the USGS sampling data, “detected” means nitrate was measured above the laboratory’s reporting limit, not that it is a violation or unsafe. In El Paso County’s aquifer 111ALVM, nitrate was detected in 344 of 388 samples, with 44 below reporting limits.

The "median" represents the middle nitrate value in the ordered set of measurements, giving a central tendency of the data. The "range" shows the lowest and highest nitrate concentrations found among all sampled wells.

These terms describe nitrate presence in the aquifer over time and geography but do not replace individual water testing to determine your own water quality.

What Test Should I Order to Confirm if I Need a Nitrate Treatment System?

To decide on the appropriate treatment class for your household, order a certified laboratory test for nitrate concentration from your own well or water source. A result near or above the federal MCL of 10.0 mg/L indicates that treatment such as a Pentair Nitrate & Nitrite (Well) Filter might be advisable.

This targeted test will provide the definitive data you need to choose the right system for your household water safety and compliance with health recommendations.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2025-12-18. 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 Nitrate in the 111ALVM aquifer (El Paso County): 388 results from 51 wells, median 10.2 mg/L, range 0.046-218.0 mg/L; 175 above a health-based federal MCL (federal MCL 10.0 mg/L)