Seasonal and Multi-Year Fluoride Variation in Dakota County

Sampling Period

Fluoride levels were recorded in Dakota County wells from September 2010 through June 2025, offering a 15-year window into local groundwater quality.

Number of Results

The dataset includes 31 fluoride measurements from six distinct wells within the aquifer 112SDGVD.

Range of Fluoride Concentrations

Fluoride values ranged from 0.21 to 0.78 mg/L over this period, showing some fluctuation but within a relatively narrow band.

Meaning of Fluoride Range Against Federal Standards

Comparison With Federal Thresholds

None of the measured fluoride concentrations exceeded federal limits for safe drinking water, indicating compliance in this aquifer.

Detection versus Safety

Every sample detected fluoride, but detection alone is not an indication of safety issues or violations.

Limits on Interpretation

Federal standards mainly address health-related limits and do not cover aesthetic concerns that sometimes accompany fluoride presence.

Comparing Dakota County Fluoride Record With Neighboring Areas

Regional Variation

Adjacent counties may show different fluoride profiles due to geologic differences; comparing them should be done cautiously without assuming similarity in any specific well.

Influence of Aquifer Characteristics

Hydrogeology affects fluoride presence; aquifer 112SDGVD’s data reflect conditions deep within 53 to 176 feet, which might not apply identically in neighboring aquifers.

Value of Area Data

Area-wide data provides context but cannot substitute for an individual well test to determine personal household water fluoride levels.

Pre-Treatment Information to Note Before Seeking Solutions

Current Water Testing Results

Obtain an up-to-date fluoride concentration from a certified laboratory for your household water source to confirm actual levels.

Existing Equipment Performance

Document the conditions and specifications of your failed equipment to identify gaps in fluoride removal capacity.

Household Water Usage Patterns

Consider the volume and flow rate of water used regularly, as this influences the sizing and configuration of any treatment system.

Common Misinterpretations to Avoid

Do Not Assume Area Data Applies Directly

Local sampling results do not reveal the exact fluoride concentration in your well or tap water.

Detection Is Not a Health Violation

Fluoride detection below federal limits does not signal unsafe water or regulatory non-compliance.

Fluoride Is Distinct From Other Contaminants

Fluoride presence differs in origin and treatment from problems like iron or sediment; confusing them may lead to ineffective solutions.

Closing Guidance

Before proceeding with any treatment, including the reliable C-Series Fluoride Filter which ships ready to configure, ensure you have precise data on your own water. Area aquifer statistics provide valuable insight but should not replace personal water testing.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2025-06-12. 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 Fluoride in the 112SDGVD aquifer (Dakota County): 31 results from 6 wells, median 0.42 mg/L, range 0.21-0.78 mg/L; none above any federal threshold