This week, you need to decide how to interpret local water quality data and whether your home's water might require treatment for heavy metals like nickel.
How many samples and wells stand behind the figures, and what a small sample means
The U.S. Geological Survey collected 26 samples from 10 separate wells within Sussex County's aquifer 112CLMB between July 2011 and August 2024. These wells ranged from 18 to 139 feet deep, providing a snapshot of nickel concentrations in the area.
While this sample size offers a reasonable overview of regional groundwater, it is important to understand this data does not specify conditions in your individual well or tap. Small sample numbers and variability between wells highlight the need for direct testing if you want precise information about your household water.
What 'detected', 'median' and 'range' mean in the sampling record on this page
In this dataset, nickel was detected in all 26 samples. The median concentration was 1.4 micrograms per liter (ug/L), with sample results ranging from 0.1 to 111.0 ug/L. Detection indicates that instruments measured nickel presence, not that it exceeds any safety or aesthetic standard.
Median values represent the middle point of measurements and help summarize the typical concentration, while the range shows the spread between the lowest and highest detections. None of the samples exceeded any federal threshold for nickel, which means there was no measurement surpassing established health-based limits.
What a certified laboratory test for this constituent reports and how to read it
If you test your well water at a certified laboratory, the report will include concentration values similar to those in the USGS data. A certified test identifies actual levels in your specific water supply, unlike regional samples which represent a broader area.
When reading your results, compare them to federal or state guidelines to understand whether treatment might be recommended. Keep in mind that nickel concentrations below or near median levels in Sussex County generally do not raise health concerns according to current regulations.
Why aesthetic secondary standards differ from health-based limits, applied to this constituent
The Environmental Protection Agency (EPA) distinguishes between primary health-based standards and secondary aesthetic standards. For nickel, secondary standards address issues like taste, staining, or corrosion, while primary standards focus on health risks.
Since none of the government samples in Sussex County aquifer 112CLMB surpassed health-based limits, detected nickel levels do not indicate a violation or unsafe condition. However, if you experience taste or staining problems, aesthetic standards might be a consideration even though they are not regulatory health limits.
The role of plumbing material and age, separate from the source water
Nickel levels in your household water may also be influenced by the materials and age of your plumbing system rather than the source water alone. Older plumbing components or certain alloys can contribute to nickel presence, regardless of the groundwater quality.
This means if your home's water tests show elevated nickel, the source aquifer data might not be the only explanation. Assessing plumbing materials and condition is an important part of understanding your water quality issues.
In summary, regional government sampling for nickel in Sussex County's aquifer 112CLMB shows detections below any federal health-based thresholds. Determining your household water’s specific condition requires certified laboratory testing and consideration of plumbing factors.
For households seeking to address nickel concerns, the Fleck Heavy Metals Filter ships ready to configure as a solution to reduce heavy metal concentrations effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-08-28. 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 Nickel in the 112CLMB aquifer (Sussex County): 26 results from 10 wells, median 1.4 ug/L, range 0.1-111.0 ug/L; none above any federal threshold
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