If you notice a subtle metallic taste or discoloration in your home water, it might prompt a concern about heavy metals like selenium from the Merrimack County aquifer. However, understanding what regional government data reveal can help shape your approach to resolving these issues.
1. Start with Basic Visual and Taste Checks Before Testing
Look for early signs like metallic taste, staining on fixtures, or unexpected discoloration. These observations are inexpensive and straightforward initial clues but cannot confirm heavy metals presence or levels.
2. Recognize the Difference Between Aesthetic Standards and Health-Based Limits for Selenium
The U.S. Geological Survey sampled 62 wells in Merrimack County aquifer, measuring selenium concentrations ranging from 0.1 to 0.5 micrograms per liter in 80 samples. These values were all below federal health-based limits, indicating no violation. However, aesthetic secondary standards—which relate to taste and staining—are handled separately and do not imply safety concerns.
3. Understand What Public-Systems Records Show Compared to Private Well Tests
Government data represent measurements from multiple wells across the Merrimack County aquifer, not individual household wells. Your own well or tap water could differ. Only a specific test of your water detailed to your home can provide your exact heavy metals levels.
4. Consider How Many Samples and Wells Inform Regional Selenium Data
The sampling includes 80 results collected from 62 wells over several months (December 2021 to March 2022). While this provides a broad regional picture, it is still a limited snapshot and does not cover all wells or conditions throughout Merrimack County.
5. Identify Which Fixtures and Appliances Might Encounter Heavy Metals First
Heavy metals such as selenium first affect water fixtures and appliances in direct contact with water flow, including taps, ice makers, and humidifiers. Recognizing where buildup or discoloration occurs can inform which areas need closer water quality evaluation.
6. Note Seasonal and Multi-Year Variation in Sampling Data
The samples span late 2021 to early 2022, allowing observation of seasonal changes within those months. Variations within the range of 0.1 to 0.5 micrograms per liter suggest some fluctuation but consistently remain under federal limits for selenium.
To conclusively determine the presence and concentration of selenium or other heavy metals in your household water, it is essential to have a certified laboratory conduct a test on your specific well or tap water. This test is the definitive step to settle concerns and inform appropriate treatment.
For addressing detected heavy metals, consider the C-Series Heavy Metals Filter, a technology documented to reduce these contaminants effectively. This system ships ready to configure to your water line without requiring specialized service calls.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2022-03-30. 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 Selenium in the aquifer (Merrimack County): 80 results from 62 wells, median 0.1 ug/L, range 0.1-0.5 ug/L; none above any federal threshold