The U.S. Navy Water System serving GU has been monitored by the EPA for volatile organic compounds (VOCs) between 2013 and 2015. According to the EPA Safe Drinking Water Information System (SDWIS) records, no VOCs were detected above reporting levels in this system, and no health-based violations have been recorded. This checklist page helps household water users understand what these findings mean, what remains unknown without specific testing, and how a targeted filtration system can address VOC concerns.

Contact Time in Granular Activated Carbon Beds

Effective removal depends more on how long water contacts the carbon than just flow rate

Granular activated carbon (GAC) beds remove VOCs and other solvent compounds by adsorbing these molecules onto their surface. The bed must be sized to provide sufficient contact time, allowing the carbon to capture VOCs effectively. Rapid flow alone is inadequate because VOCs need enough interaction time to transfer from water to carbon. This sizing ensures better reduction of solvent compounds like 1,1-dichloroethane and bromomethane when present.

Laboratory Detection Limits and 'Not Detected' Results

Understanding what 'not detected' means in the EPA's VOC monitoring

The EPA's monitoring results list reporting levels such as 0.03 micrograms per liter (µg/L) or parts per billion (ppb) for specific VOCs. A 'not detected' result means the compound was below these method detection limits, not necessarily absent. It indicates the test did not find measurable VOCs at or above the set threshold. Individual household water may have different levels, so on-site testing is required to know exact concentrations.

Consequences of Untreated VOCs Over Time

Long-term effects of volatile organics in water without filtration

When VOCs remain unremoved from household water, they can affect water quality over years. Some solvent compounds may cause taste or odor issues, and certain VOCs can lead to staining or corrosion of plumbing materials. While the EPA record for this system shows no health-based violation, accumulating VOCs could eventually contribute to aesthetic or maintenance concerns.

Fixtures, Appliances, and Processes First Impacted by VOCs

Which household points show effects earliest and why

• Water heaters and appliances with heating elements can amplify VOC smells due to heat volatilizing these compounds.
• Drinking water faucets and ice makers are sensitive to taste and odor changes caused by VOCs.
• Washing machines using untreated water might be affected if solvent compounds stain fabrics over time.

Distinguishing Aesthetic Secondary Standards from Health-Based Limits

Why chloride or total dissolved solids limits don’t apply to VOCs’ health concerns

Aesthetic secondary standards address taste, color, and staining rather than safety. For volatile organic compounds such as those monitored, the EPA has not established federal maximum contaminant levels (MCLs). Therefore, exceedances of aesthetic thresholds do not equate to health risks. The absence of detected VOCs above reporting limits in this water system further supports compliance with health standards.

Meaning of 'Detected,' 'Median,' and 'Range' in the EPA Sampling

How to interpret the VOC monitoring data reported for GU

• Detected: Compounds identified above the method reporting level; in this system, none were above those levels during monitoring.
• Median: The middle value of detected concentrations, not applicable here since all were below detection.
• Range: The spread between lowest and highest detected levels; all results for listed VOCs were below detection limits.

In summary, EPA sampling of the U.S. Navy Water System in GU showed no VOC detections above reporting levels, indicating no health-based violations for volatile organics. However, individual household water quality can only be confirmed through specific testing. For households concerned about volatile organic compounds, a treatment option like the Autotrol VOCs & Industrial Chemicals Filter ships ready to configure, providing a specialized granular activated carbon system designed to reduce VOCs and solvent compounds effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-04-27. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for U.S. Navy Water System (GU0000010), GU: 168 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level