What does the sulfide range measured in James City County aquifer 110QRNR say about my water and federal limits?
Groundwater sampling by the U.S. Geological Survey in James City County, focusing on the 110QRNR aquifer, found sulfide present in all tested wells, ranging from 4.0 to 367.0 mg/L with a median value of 16.0 mg/L. These samples, taken from wells 7 to 29 feet deep, did not exceed any federal health-based limits. This means while sulfide was detected, it does not indicate a violation or unsafe condition by federal standards. The measurements reflect regional aquifer conditions and not your household well specifically.
What information about my water and usage should I have ready before seeking advice on sulfur smell treatment?
To make an informed treatment decision, note the following:
- Results from a certified laboratory test of your own well or water source showing sulfide concentration;
- The depth of your well and typical water use volume daily;
- Any specific areas or appliances where sulfur smell is most noticeable;
- Whether your water supply is from a shallow well similar to those sampled;
- Any previous water treatment methods you have tried for sulfur smell;
- Other water quality concerns you may have identified.
How do sample depth and water source type affect what I should expect from treatment?
The area sampling focused on relatively shallow wells (7 to 29 feet deep), which can experience different sulfide concentrations than deeper or municipal sources. Household wells deeper than those sampled may have lower or different sulfide levels. Knowing your well’s depth helps anticipate the nature of sulfur compounds and any additional minerals or gases present, which can influence treatment effectiveness.
How should I judge the treatment capacity needed for sulfur smell against household water usage?
Treatment capacity should align with daily water demand to ensure effective sulfur reduction without overloading the system. Consider your household’s peak water usage hours and total volume, and compare that to the device’s performance specs provided by the supplier. This helps maintain consistent odor control without frequent filter replacement or loss of water flow.
What is the maintenance routine for the C-Series Rotten-Egg Sulfur Smell Filter?
The C-Series system ships ready to configure and uses filtration media designed to reduce sulfur compounds responsible for rotten-egg odors. Its maintenance involves periodic media replacement according to usage and water quality, with guidelines provided by the manufacturer. Regular system checks ensure ongoing odor control and water quality without complicated upkeep.
Keep in mind, the regional data presented here do not establish the sulfide concentration or safety in your individual household water. Testing your own well remains essential for targeting the right treatment and understanding your water’s specific characteristics.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2017-11-22. 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 110QRNR aquifer (James City County): 11 results from 10 wells, median 16.0 mg/L, range 4.0-367.0 mg/L; none above any federal threshold

