What does government sampling show about nitrate in Richland County's water?
The U.S. Geological Survey conducted groundwater sampling in Richland County's aquifer 211MDDF between 2011 and 2016, analyzing 30 nitrate and nitrite results from 26 wells ranging from 9 to 140 feet deep. In this sample, nitrate and nitrite were detected in 22 results, with a median concentration of 0.8635 mg/L and a range from 0.061 to 7.82 mg/L, and no results exceeded federal nitrate safety thresholds.
What do terms like 'detected', 'median', and 'range' mean in this sampling record?
'Detected' means that nitrate or nitrite was measurable by instruments in a sample, not that it is harmful or exceeds any limit. The 'median' represents the middle value of all measurements, where half the results were higher and half lower. The 'range' shows the lowest and highest nitrate values found in these specific wells. Since these measurements come from multiple wells over time, they reflect area conditions rather than any one household's water.
How does the measured nitrate range compare to federal standards, and what should it not be taken to mean?
The federal standard for nitrate in drinking water is set to protect health, and none of the sampled wells in this area exceeded that threshold. This means the nitrate concentrations measured were within safe limits according to federal guidelines. However, these area-wide results do not establish the nitrate level in any individual household's water supply, as local variations can occur.
What is the best approach to determine if your household water has a nitrate concern?
Start with a simple visual and taste check, although nitrate itself is tasteless and odorless. If you rely on a private well, the most reliable method to know your water's nitrate level is to have your water tested by a certified laboratory. This test will provide a precise measure of your home's water quality. Routine testing is important especially for households with infants or pregnant women, as nitrate can have specific health effects in these groups.
How can a homeowner use the area sampling median and range to understand their water?
Consider the median nitrate level of 0.8635 mg/L as a reference point for typical conditions in the aquifer, with the range indicating that some wells may have lower or higher nitrate presence. If your household tests show nitrate within or below this range, it aligns with what has been found in the area samples. If your results exceed this range, further evaluation is warranted, though no data here indicates that area samples exceeded federal safety levels.
Can household plumbing age or materials influence nitrate readings independently of source water?
Unlike some other water quality issues, nitrate levels are generally not affected by plumbing materials or system age. Nitrate is a dissolved compound that originates from sources outside the plumbing system. Therefore, plumbing condition does not alter nitrate concentration once water enters a home. Plumbing may affect other aesthetic water qualities but not nitrate levels.
What should you not conclude from the area nitrate sampling data?
Do not assume that your household water nitrate concentration matches the median or range found in the area samples. Area data provide insight into general aquifer conditions but do not replace specific testing for your home’s water. Also, detection of nitrate in the area does not mean the water is unsafe; the sampling record clearly shows no federal safety thresholds were exceeded. To address your household's nitrate level, testing your specific water source is the essential step, and if treatment is desirable, a C-Series Nitrate & Nitrite (Well) Filter ships ready to configure to help reduce nitrate concentrations effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2016-09-01. 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 211MDDF aquifer (Richland County): 30 results from 26 wells, median 0.8635 mg/L, range 0.061-7.82 mg/L; none above any federal threshold