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What a Laboratory Test Report Lists for Sulfide in Groundwater of FIPS 160, CT

Laboratory analyses for sulfide typically state the concentration in milligrams per liter (mg/L) detected in a given sample. In the FIPS 160 area of Connecticut, the U.S. Geological Survey collected four samples of groundwater from three wells in aquifer 112DFSF between September 19, 2011, and September 8, 2017. The reported sulfide concentrations ranged from 0.0 to 0.1 mg/L, with a median value of 0.0165 mg/L. All samples were below any federal threshold levels. This information is about regional groundwater quality and does not indicate the sulfide level in any individual household water supply. Confirming the status in your own well or supply requires specific local water testing.

How Sulfide Enters Groundwater in This Connecticut Aquifer

Sulfide in groundwater, often related to the sulfur smell sometimes described as "rotten egg" odor, results from naturally occurring processes in the aquifer. Organic material decomposition and sulfate-reducing bacteria reduce sulfate compounds to sulfide, which can dissolve in groundwater. The presence and concentration of sulfide vary naturally depending on geological conditions and well depth. The sampled wells in this dataset ranged from 13 to 273 feet deep, indicating that sulfide presence is not confined to a single depth zone in aquifer 112DFSF.

How Seasonal or Multi-Year Variation Shows in the Sulfide Record

The USGS samples from 2011 to 2017 show variation in sulfide levels over multiple years but within a limited range. The lowest reported sulfide was non-detectable (0.0 mg/L), and the highest reached 0.1 mg/L. While these samples do not reveal strong seasonal patterns, multi-year fluctuations can occur due to changes in groundwater chemistry, recharge rates, and biological activity influencing sulfide production. These variations mean a single test may not fully represent longer-term trends in your water supply.

Differences Between Public-System Records and Private Well Testing

The sulfide data presented here comes from public groundwater monitoring wells in the region; they provide a regional overview but do not substitute for testing of private household wells. Public system samples often follow regular schedules and standardized protocols but represent broader aquifer conditions rather than individual household water. Private well water can differ notably in sulfide levels due to local geology, well construction, and water usage patterns. For those experiencing sulfur smell at home, specific testing of their water supply is necessary to understand their actual sulfide concentration.

Sample Size and What a Small Number of Wells Means for Interpretation

The dataset includes only four samples from three separate wells over six years. Such a small sample size limits the ability to generalize sulfide concentrations across the entire FIPS 160 area aquifer. While the results offer useful baseline information indicating sulfide is present but below thresholds of concern regionally, they do not capture all possible variations or localized spikes. Households should consider this limitation when comparing their own water conditions to these findings.

Comparing Sulfide Records with Nearby Counties Without Overreading

When comparing sulfide data from FIPS 160, CT to neighboring counties, it is important to note that geological and hydrological differences can significantly affect sulfide presence. Regional aquifer compositions, microbial activity, and land use vary, so direct comparison requires caution. A higher or lower median sulfide level in an adjacent area does not mean a household's water quality will match those values. Each location's water should be evaluated based on its own testing and conditions.

How the Fleck System Treats Sulfur Smell in Household Water

The Fleck Rotten-Egg Sulfur Smell Filter works by targeting sulfide compounds responsible for the sulfur odor in water. It uses a filtration process designed to remove or neutralize dissolved sulfides effectively before water reaches household taps. This system ships ready to configure for residential use and can address sulfur smell issues linked to sulfide presence as measured in your household water. Proper testing to determine your specific demand figure is recommended to select the appropriate configuration.

Understanding the regional sulfide data from USGS sampling in FIPS 160 and aquifer 112DFSF helps frame expectations, but individual household water conditions require separate measurement. For households experiencing sulfur smell, the Fleck Rotten-Egg Sulfur Smell Filter offers a documented approach to reducing this odor based on your test results.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2017-09-08. 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 Sulfide in the 112DFSF aquifer (FIPS 160): 4 results from 3 wells, median 0.0165 mg/L, range 0.0-0.1 mg/L; none above any federal threshold