How seasonal water-table changes move a solvent plume relative to a well screen

Seasonal rainfall and surface water levels impact solvent distribution

In Arapahoe County, water supply from East Cherry Creek Valley WSD depends on surface water, which varies seasonally. These changes influence where solvent compounds like volatile organic compounds or VOCs move in the water system, but the data available is from a public system level, not a single household well or tap.

Solvent plumes can shift position with local hydrology

Subsurface solvent plumes, often composed of volatile organics such as 1,1-dichloroethane and MTBE, may move due to groundwater table fluctuations. This means the concentration near a household intake could differ over time and location, though regional monitoring reflects averages across the system.

Why a granular activated carbon bed is sized for contact time rather than flow alone

Contact time ensures effective volatile organics absorption

Granular activated carbon (GAC) filters reduce VOCs by adsorbing solvent compounds. The performance depends primarily on how long water contacts the carbon bed—not just on flow rate. A larger contact time allows more thorough removal of VOCs like chloromethane or bromomethane, even if these compounds are not detected above reporting levels in the regional record.

Flow rate alone may not predict filter efficiency

High flow can decrease the carbon's ability to capture volatile organics efficiently. Properly configured systems balance flow with contact time to optimize VOC reduction, which matters especially if household equipment has failed and requires a reliable alternative.

The household or facility symptoms that do and do not point to this problem

Symptoms linked to VOC presence

• Unusual taste or smell in water may suggest volatile organic chemicals
• Potential staining or discoloration from related chemical compounds

What symptoms are unrelated to VOCs

• Hardness issues or mineral deposits typically result from dissolved solids, not VOCs
• Biological contaminants or turbidity are separate concerns unconnected to volatile organics

What 'detected', 'median' and 'range' mean in the sampling record on this page

'Detected' means measurement above an instrument's reporting level only

For the East Cherry Creek Valley WSD system, no VOC compound was detected above reporting levels. Detection does not imply health risk or legal exceedance. It simply means measuring equipment can find at least that much compound.

'Median' and 'range' describe variation, not safety

Median values summarize typical measurements across samples; ranges show minimum to maximum. These statistics inform understanding of water quality trends in a system, not for individual homes.

What distinguishes this problem from the two problems most often confused with it

VOCs versus mineral hardness or sediment issues

Volatile organic compounds differ chemically and behaviorally from minerals causing hardness or sediments causing cloudiness. Treatment focuses specifically on solvents, not on scale or particles.

VOCs versus microbial contamination

Volatile organics are chemical pollutants with different detection methods and treatment from biological contaminants like bacteria or viruses. This page addresses only VOCs, as confirmed by regional EPA records without health-based violations.

Closing

Regional water data for Arapahoe County's East Cherry Creek Valley WSD shows no detection of VOCs above reporting levels in monitoring from 2013 to 2015. Households noticing symptoms or with failed equipment may consider a properly sized granular activated carbon system, such as the C-Series VOCs & Industrial Chemicals Filter, which ships ready to configure for solvent removal based on contact time.

Testing your own water is essential to determine personal VOC levels. Municipal system records provide useful context but cannot replace specific analysis for household decision-making.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2014-11-10. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for East Cherry Creek Valley WSD (CO0103035), CO: 150 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level