1. What a Certified Laboratory Test for Nitrate Reports and How to Read It
Laboratory analyses for nitrate and nitrite, collectively measured as inorganic nitrogen, present results in milligrams per liter (mg/L). The report from a certified lab details the measured concentration, with values that can range from below a reporting limit to a quantified range. For McLean County's aquifer 110QRNR, U.S. Geological Survey data from 2010 to 2018 shows nitrate levels in sampled wells spanning from as low as 0.01 mg/L to as high as 10.2 mg/L, with a median concentration of 2.69 mg/L. These measurements reflect the water quality at the sampled wells, not individual household water. Understanding these numbers helps in interpreting test results but determining your household’s specific nitrate level requires testing of your own water source.
2. The Role of Plumbing Material and Age, Separate From the Source Water
While nitrate originates primarily from groundwater sources, the water’s journey through plumbing systems can influence water quality but does not affect nitrate concentration directly. Plumbing materials and the age of pipes may impact other water characteristics, yet nitrate levels measured in a lab test reflect the raw water entering the system. Thus, plumbing considerations, though important for overall water quality, do not change the nitrate content established at the well or main supply point.
3. How to Judge Treatment Capacity Against the Household's Daily Demand
A household’s daily water use influences the required capacity of any nitrate treatment solution. Since nitrate concentration in McLean County wells varies, ensuring that treatment can handle the volume and nitrate load typical for the household is vital. If current equipment struggles to keep pace, assessing flow rates, peak demand times, and cumulative nitrate load provides a clear picture of whether additional or upgraded treatment capacity is needed to maintain acceptable water quality at the tap.
4. How Seasonal or Multi-Year Variation Shows in the Record
The nitrate data from the McLean County aquifer 110QRNR was collected over nearly eight years, revealing variability over time and among wells. With 42 of 58 samples detecting nitrate and one result above the federal maximum contaminant level (10.0 mg/L), this record reflects fluctuations that can occur naturally or from environmental factors. This variation means nitrate concentration in household water may change seasonally or year-to-year, emphasizing the importance of periodic testing to capture current conditions accurately.
5. What Changes for a Large Household, a Second Home, or a Seasonal Property
Larger households or properties with varying occupancy patterns, such as second homes used seasonally, face different challenges in nitrate management. Increased water usage demands higher treatment capacity, while intermittent use may allow nitrate buildup or influence system performance. Understanding these patterns helps in selecting and sizing treatment options that are responsive to the specific water use and nitrate levels relevant to the property type.
6. How the Treated Water Differs at the Tap Once the Documented Technology Is in Place
Employing the Pentair Nitrate & Nitrite (Well) Filter system modifies the water’s nitrate content after treatment. This equipment is designed to reduce inorganic nitrogen concentrations by removing nitrate and nitrite to levels that comply with health-based standards. The treated water at the tap typically shows lowered nitrate values, contributing to safer water for household activities. However, the effectiveness depends on proper sizing and matching treatment capacity to the household's nitrate load and water demand.
Final Step: The Key Test to Confirm Household Water Quality
To know your household’s nitrate level precisely, ordering a certified laboratory test of your own well or tap water is essential. The test report will indicate whether nitrate concentration is below or approaches the federal maximum contaminant level of 10.0 mg/L. This result settles the question of nitrate presence in your water and guides decisions on treatment needs or adjustments.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2018-08-01. 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 110QRNR aquifer (McLean County): 58 results from 11 wells, median 2.69 mg/L, range 0.01-10.2 mg/L; 1 above a health-based federal MCL (federal MCL 10.0 mg/L)