What the EPA Sampling Record Tells Us
The public water system serving Larned in Pawnee County, KS, draws from groundwater and serves about 3,621 people via 1,996 connections. Federal monitoring under the Unregulated Contaminant Monitoring Rule (UCMR3) found no detections of listed volatile organic compounds (VOCs) above laboratory reporting thresholds during 2013-2015.
Why Granular Activated Carbon Beds Are Sized for Contact Time, Not Flow Alone
Contact time ensures enough exposure for VOC removal
VOC treatment relies on contact between water and the carbon media to adsorb volatile organics. Sizing the carbon bed considers how long water remains in contact, not just gallons per minute flow, since insufficient contact time will limit contaminant removal.
Flow rate affects system sizing but not VOC capture alone
Systems sized only by flow rate may allow water to pass too quickly, reducing filtration efficiency. Effective VOC reduction balances flow and contact time to optimize adsorption.
What Laboratory Method Detection Limits Mean When a Compound Is 'Not Detected'
'Not detected' means below a specific threshold, not absence
Each VOC has a laboratory reporting level, also known as the method detection limit. A 'not detected' result indicates that the compound's concentration was below this threshold (e.g., 0.03 µg/L for 1,1-dichloroethane), but small amounts could still be present.
Detection limits vary by compound and affect interpretability
For example, MTBE has a higher detection threshold (5.0 µg/L) compared to halon 1011 (0.06 µg/L). Non-detection does not guarantee the water is free from all traces but shows levels below these analytical sensitivities.
How Public Water System Records Differ from Private Well Testing
System records reflect broad samples, not individual homes
The EPA data summarizes results from the City of Larned's groundwater supply, representing averaged or composite data across multiple wells serving thousands. It does not describe conditions at any single residence.
Homeowners should arrange private VOC testing for precise results
Only a direct test of household water confirms which VOCs, if any, are present and at what concentration. Regional data may not capture localized changes or well-specific issues.
What 'Detected', 'Median', and 'Range' Mean in This Sampling Record
Detected means measurable above the lab reporting level
For the VOCs monitored such as 1,1-dichloroethane, chloromethane, or MTBE, the 2013-2015 Larned samples showed zero detections above reporting levels, indicating the tests did not find quantifiable amounts.
Median and range terms do not apply when no compounds are detected
Since no VOCs were detected above relevant thresholds, statistical measures like median concentration or range across samples are not established in this data set.
How the Documented Treatment Technology Removes or Neutralizes Solvent Compounds
Fleck VOCs & Industrial Chemicals Filter uses granular activated carbon
This technology adsorbs volatile organics and solvent compounds onto a carbon medium. The process physically traps VOC molecules from water, reducing their concentration and impact.
Effective removal depends on sufficient contact time and system sizing
Because VOCs vary in chemical properties, the system emphasizes a contact bed design to maximize interaction with the carbon media. This ensures better treatment than sizing by flow alone.
What You Should Not Conclude From the Area Data
Federal monitoring found no VOCs above detectable limits in Larned’s system samples, but that does not mean every home's water is free from VOCs. Detection limits set what labs can measure, not absolute absence. Home testing is essential to understand your specific water quality. Furthermore, no VOC measurements correspond to any EPA health-based violation or unsafe water finding.
Choosing a VOC treatment class involves understanding your water’s detailed profile, which this regional data guides but does not replace. The Fleck VOCs & Industrial Chemicals Filter ships ready to configure for effective residential treatment once your own water data clarifies needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-09-08. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Larned (KS2014505), KS: 70 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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