Myth: Area nitrate levels fully represent your household's water quality
Government groundwater data from Cumberland County's aquifer 112ICCC shows inorganic nitrogen (nitrate and nitrite) detected in most local wells, with a median concentration of 1.23 mg/L from 49 samples across 11 wells during 2010 to 2017. However, these results reflect the region, not individual wells. Your home's nitrate concentration can only be determined through a certified laboratory test of your actual water source. This is especially important when previous treatment equipment has failed, since untreated water chemistry will vary well by well.
Myth: A nitrate laboratory test only reveals simple ppm numbers without detail
A certified laboratory test for nitrate and nitrite reports precise concentrations in milligrams per liter (mg/L). It differentiates between total inorganic nitrogen forms and detects levels even below reporting limits. A test result well below the federal Maximum Contaminant Level (MCL) of 10.0 mg/L means nitrate presence is not exceeding the health-based threshold. If levels approach or surpass this figure, it signals the need for treatment solutions tailored to your home's water usage and quality.
Myth: Plumbing materials and system age affect nitrate levels in water
Nitrate concentrations originate from groundwater quality and are not altered by household plumbing materials or the age of piping. While plumbing can influence other water aspects, nitrate ions come directly from the water source and bypass reactions with household pipes. Thus, nitrate levels measured in your well water reflect source conditions rather than internal plumbing chemistry.
Myth: Sample depth or well depth has minimal effect on nitrate presence
In Cumberland County aquifer 112ICCC, sampled wells ranged from 20 to 132 feet deep. Deeper wells may encounter different nitrate concentrations due to geological and land use factors influencing nitrate infiltration. Therefore, your well depth can significantly affect nitrate exposure and should be considered when assessing water quality and treatment needs, rather than relying solely on area-wide data.
Myth: Treatment capacity does not need matching to household water demand
After failure of your existing nitrate treatment system, it's critical to select equipment that meets your household's daily water volume and nitrate level. Nitrate removal devices designed for well water—such as the Fleck Nitrate & Nitrite (Well) Filter—ship ready to configure for residential use. Their capacity should be aligned with peak and average household consumption to ensure consistent nitrate reduction without risking system overload or untreated water bypass.
What not to conclude from Cumberland County aquifer nitrate data
While regional sampling shows some nitrate values above the federal MCL, this does not confirm your specific well’s nitrate concentration or imply a violation. Nitrate detections vary greatly in this area, from very low to higher levels. Without a certified lab test of your home’s water, assumptions about safety or treatment needs cannot be made. Also, nitrate sources and concentrations can shift over time due to land use, seasonal changes, and well conditions. Proper testing and matched treatment remain essential especially after prior equipment failure.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-10-11. 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 Inorganic nitrogen (nitrate and nitrite) in the 112ICCC aquifer (Cumberland County): 49 results from 11 wells, median 1.23 mg/L, range 0.04-36.0 mg/L; 7 above a health-based federal MCL (federal MCL 10.0 mg/L)