The City of Chandler’s public water system, serving over 247,000 people in Maricopa County, AZ, relies on surface water sources and has undergone EPA monitoring for various unregulated contaminants including volatile organic compounds (VOCs). From 2013 to 2015, federal occurrence surveys detected no VOCs above laboratory reporting thresholds in this system’s water supply.
What does it mean when a laboratory 'does not detect' a volatile compound?
When federal sampling records indicate 'no detection' for compounds such as 1,1-dichloroethane, chloromethane, or MTBE, this reflects that the instrument’s detection limit was not surpassed. These detection limits represent the smallest concentration the lab method can reliably identify. Absence of detected levels means concentrations are below that limit, not necessarily zero. Thus, 'not detected' indicates that if these VOCs are present, they are at very low concentrations under the defined thresholds.
Why is volatility important when considering exposure routes like showering and dishwashing?
VOCs, also called volatile organics or solvent compounds, can easily evaporate from water into air during activities such as showering, washing dishes, or cooking. This can lead to inhalation exposure beyond drinking water consumption. Because some VOCs can volatilize readily, considering air inhalation exposure is important when household water contains these compounds, even at low levels. This is a distinct consideration apart from oral ingestion.
What do the terms 'detected', 'median', and 'range' indicate in this water quality record?
In the Chandler water system’s record, none of the VOCs were detected above reporting levels, so median concentrations and ranges are not presented. 'Detected' means a compound’s concentration met or exceeded the lab’s detection limit. 'Median' refers to the middle value when multiple test results are arranged in order, and 'range' indicates the span between lowest and highest detected values. Because no detections were reported, the record shows these VOCs are below federal detection capabilities during sampling.
How many samples and water sources support these findings, and why does sample size matter?
The EPA’s dataset includes 58 to 73 samples per compound collected between 2013 and 2015 from Chandler’s surface water system. While hundreds of thousands of connections exist in the system, these samples represent composite system monitoring, not individual tap water tests. A moderate sample size gives useful insight into typical source water quality trends but cannot confirm every household’s water conditions. Variability among water lines and plumbing means individual testing is needed for precise assessment.
How do sample depth, well depth, or water source type affect expectations about VOC presence?
Chandler public water derives from surface water, which generally differs in VOC profiles from groundwater or private well sources. Surface water tends to have lower VOC contamination risks than wells near industrial or gasoline release sites. The sample depth and type influence which compounds may appear and at what levels. Therefore, the EPA’s surface water monitoring data provide a broad picture but do not substitute for private well or home-specific water testing where source conditions vary widely.
If you have household water treatment equipment that has failed and you are concerned about VOCs or other volatile organics, the single best step is to obtain a detailed water analysis performed by a qualified laboratory. This test should specifically measure VOC concentrations in your home’s water system.
After confirming your water quality, solutions like the Autotrol VOCs & Industrial Chemicals Filter can be directly purchased and configured to address detected VOCs effectively. This equipment uses proven filtration technology designed to reduce volatile organic compounds and industrial chemical contaminants, assisting in restoring safe water conditions for your household needs.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-11-06. 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 Chandler (AZ0407090), AZ: 421 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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