What the Measured Range Means Against the Relevant Federal Standard—and What It Does Not Mean
In Ingham County, groundwater sampling focused on inorganic nitrogen (nitrate and nitrite) has recorded concentrations ranging from 0.04 mg/L to 4.54 mg/L with a median of 0.335 mg/L based on 51 results from 45 wells between 2015 and 2017. None of these measurements exceeded federal regulatory thresholds for these constituents in drinking water. This indicates that while nitrate is present at measurable levels in some tested wells, in the area samples it does not surpass levels established for health-based compliance. It is essential to understand that a detection or a range found in area samples does not directly reflect any individual household's water nitrate level. Only a specific test of your own well or water source can establish your actual water nitrate content.
What 'Detected', 'Median', and 'Range' Mean in the Sampling Record on This Page
Out of 51 samples, nitrate was detected above the reporting limit in 6 samples and below it in 45, resulting in a reported range from 0.04 to 4.54 mg/L and a median at 0.335 mg/L. A detection means an instrument reading was obtained indicating the presence of the constituent; it is not an indication of safety or violation. The median value represents the middle point of all measurements, offering a typical concentration level from these sampled wells in the area, while the range represents the spread of all values recorded. These statistics provide a regional snapshot rather than a direct reflection of your own water's nitrate concentration.
Which Fixtures, Appliances or Processes Are Affected First and Why
Nitrate presence in household water primarily affects consumption points such as kitchen taps and points used for preparing infant formula or drinking water. Nitrate does not generally cause aesthetic issues like discoloration or odor; therefore, it may go unnoticed without testing. Treatment may become important for drinking and cooking water to mitigate potential health risks, particularly for vulnerable populations such as infants and pregnant women. Other household uses like laundry or irrigation are typically less affected since nitrate does not impact fabric or plants directly in the concentrations usually detected.
Why Aesthetic Secondary Standards Differ from Health-Based Limits, Applied to This Constituent
Nitrate is regulated by a health-based standard rather than an aesthetic secondary one. This means that limits set for nitrate target health protection rather than taste, staining, or odor effects. Some water constituents have thresholds primarily for aesthetic reasons—such as preventing discoloration or corrosion—but nitrate’s main concern is respiratory or metabolic effects at high concentrations. The data from Ingham County groundwater shows no exceedance of these health-based standards, indicating that nitrate is unlikely to cause health concerns at the regional level sampled.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
If you consider the median nitrate level of 0.335 mg/L in local groundwater, this value is well below federal maximum contaminant levels established to protect health. The highest measured concentration found was 4.54 mg/L, still below the regulatory limit. For a homeowner, these figures suggest that while nitrate is detectable, it is generally present at low concentrations in the aquifer beneath Ingham County. To confirm if your water matches this general finding, a professional water test for nitrate specific to your household supply is recommended, as local variability can occur due to well depth (7 to 221 feet sampled) and other site-specific factors.
How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The data is based on 51 individual sample results from 45 distinct wells collected over nearly two years. This sample size and geographic spread provide a broad representation of the aquifer’s nitrate status but may not capture all local variations within Ingham County. A smaller or less diverse sample set could miss isolated higher concentrations, so while these figures offer a useful overview, they cannot substitute for testing individual household water sources where nitrate treatment is being considered.
What You Should NOT Conclude from Area Data
Area-wide nitrate data does not establish the nitrate content in your household water supply. Detected nitrate in some wells within Ingham County does not imply your water contains nitrate at those levels, nor does it indicate unsafe conditions. Also, these figures do not reflect seasonal or well-specific fluctuations that may occur. The only way to accurately assess your household's nitrate level and treatment needs is through a direct test of your water source. Should your test indicate elevated nitrate levels, the C-Series Nitrate & Nitrite (Well) Filter ships ready to configure and can provide tailored treatment for residential nitrate and nitrite reduction.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-07-18. 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 Inorganic nitrogen (nitrate and nitrite) in the aquifer (Ingham County): 51 results from 45 wells, median 0.335 mg/L, range 0.04-4.54 mg/L; none above any federal threshold