Tetrachloroethylene: The Contaminant in Tap Water You Didn't Know Was Harming Your Health

Written by Craig "The Water Guy" Phillips

**Tetrachloroethylene, commonly known as perchloroethylene or PCE, is a silent threat lurking in drinking water supplies across communities worldwide.**
This colorless, sweet-smelling chemical compound has been contaminating our tap water for decades, often without public awareness of its presence or potential health consequences. As a synthetic organic compound primarily used in dry cleaning operations and industrial processes, tetrachloroethylene represents one of the most concerning yet underreported water contaminants affecting public health today. Understanding this chemical's presence in our water supply, its sources, health implications, and available solutions is crucial for protecting ourselves and our families from its harmful effects.

Understanding Tetrachloroethylene and Its Properties

**Tetrachloroethylene is a chlorinated hydrocarbon with the chemical formula C₂Cl₄, belonging to a family of volatile organic compounds (VOCs) that pose significant environmental and health concerns.**
This synthetic chemical was first synthesized in 1821 and has since become widely used in various industrial applications due to its excellent solvent properties and ability to dissolve fats, oils, and greases without being flammable. The compound is also known by several other names, including perchloroethylene, PCE, perc, and tetrachloroethene, all referring to the same hazardous substance.

**What makes tetrachloroethylene particularly concerning is its persistence in the environment and its ability to travel long distances through groundwater systems:**

• High density that causes it to sink through soil and groundwater
• Chemical stability that prevents natural breakdown
• Volatility that allows it to evaporate into indoor air from contaminated water
• Solubility characteristics that enable widespread water contamination

Primary Sources of Tetrachloroethylene Water Contamination

**The contamination of drinking water by tetrachloroethylene primarily occurs through industrial activities and improper waste disposal practices that have been ongoing for decades.**
Understanding these sources is essential for communities to identify potential contamination risks and take appropriate protective measures. The widespread use of this chemical in various industries has created multiple pathways for environmental contamination, making it a persistent problem in many water supplies.

**Dry cleaning operations represent the most significant source of tetrachloroethylene contamination in urban and suburban areas:**

• Improper disposal of cleaning solvents and contaminated materials
• Leaks from underground storage tanks and piping systems
• Spills during chemical handling and transfer operations
• Vapor emissions that eventually contaminate soil and groundwater

**Industrial manufacturing processes contribute substantially to tetrachloroethylene environmental contamination:**

• Production facilities for textiles, metals, and automotive parts
• Chemical manufacturing plants using PCE as a solvent or intermediate
• Electronics manufacturing where PCE is used for degreasing components
• Historical disposal practices at industrial sites and landfills

Health Effects and Medical Concerns

**Exposure to tetrachloroethylene through contaminated drinking water poses serious acute and chronic health risks that affect multiple body systems.**
The scientific evidence linking PCE exposure to various health problems has grown substantially over the past several decades, with researchers documenting everything from immediate symptoms to long-term diseases. The severity of health effects typically depends on the concentration level, duration of exposure, and individual susceptibility factors such as age, overall health status, and genetic predisposition.

**Short-term exposure to tetrachloroethylene can cause immediate neurological and respiratory symptoms:**

• Dizziness, headaches, and confusion
• Nausea, vomiting, and gastrointestinal distress
• Respiratory irritation and breathing difficulties
• Skin and eye irritation upon contact
• Coordination problems and motor skill impairment

**Long-term exposure to tetrachloroethylene has been associated with severe chronic health conditions:**

• Increased risk of kidney cancer and liver cancer
• Non-Hodgkin's lymphoma and other blood cancers
• Liver damage and dysfunction
• Kidney disease and renal system damage
• Neurological disorders and cognitive impairment
• Reproductive problems and developmental issues

**Pregnant women and children face particularly elevated risks from tetrachloroethylene exposure:**

• Birth defects and developmental abnormalities
• Low birth weight and premature delivery
• Learning disabilities and behavioral problems
• Increased susceptibility to childhood cancers

Detection and Testing Methods

**Detecting tetrachloroethylene in drinking water requires specialized testing methods and laboratory analysis, as this contaminant is typically odorless and tasteless at harmful concentration levels.**
While tetrachloroethylene may have a sweet smell at very high concentrations, most contaminated water supplies contain levels that are undetectable by human senses yet still pose significant health risks. Professional water testing is the only reliable method to determine the presence and concentration of this dangerous chemical in your drinking water supply.

**Professional laboratory testing methods for tetrachloroethylene detection include:**

• Gas chromatography-mass spectrometry (GC-MS) analysis
• Volatile organic compound (VOC) screening tests
• EPA Method 524.2 for drinking water analysis
• Headspace analysis for detecting vapor concentrations

**When should you consider testing your water for tetrachloroethylene?**

• Living near current or former dry cleaning establishments
• Proximity to industrial facilities or manufacturing plants
• Well water sources in areas with known contamination
• Unusual taste, odor, or appearance in drinking water
• Health symptoms that might indicate chemical exposure

Treatment and Removal Solutions

**Removing tetrachloroethylene from contaminated drinking water requires advanced treatment technologies specifically designed to eliminate volatile organic compounds.**
The good news is that several proven treatment methods can effectively reduce or eliminate tetrachloroethylene from your water supply, providing safe drinking water for you and your family. The choice of treatment method depends on factors such as contamination levels, water usage requirements, budget considerations, and whether you need point-of-use or whole-house treatment.

**Activated carbon filtration represents one of the most effective and widely used methods for tetrachloroethylene removal:**

• Granular activated carbon (GAC) systems for whole-house treatment
• Carbon block filters for point-of-use applications
• Regular filter replacement to maintain effectiveness
• NSF/ANSI certification for VOC reduction performance

**Advanced oxidation processes provide another highly effective treatment option:**

• UV light combined with hydrogen peroxide
• Ozone treatment systems
• Photocatalytic oxidation technology
• Higher initial costs but very effective contaminant destruction

**Air stripping and aeration systems work by transferring tetrachloroethylene from water to air:**

• Packed tower aeration systems
• Diffused aeration treatment
• Effective for high-concentration contamination
• Requires proper ventilation to prevent indoor air contamination

Frequently Asked Questions

**Understanding tetrachloroethylene contamination often raises many questions about exposure risks, testing procedures, and treatment options.**
Here are the most commonly asked questions about this water contaminant and their detailed answers to help you make informed decisions about protecting your health and your family's safety.

Q: How does tetrachloroethylene get into drinking water supplies?
A: Tetrachloroethylene enters drinking water primarily through groundwater contamination from dry cleaning operations, industrial facilities, and improper waste disposal. The chemical can travel long distances through soil and groundwater, contaminating wells and water supplies far from the original source.

Q: What are the EPA maximum contaminant levels for tetrachloroethylene in drinking water?
A: The EPA has set a maximum contaminant level (MCL) of 5 parts per billion (ppb) for tetrachloroethylene in public drinking water systems. However, many health experts believe that no level of exposure is completely safe, especially for vulnerable populations.

Q: Can boiling water remove tetrachloroethylene contamination?
A: Boiling water can reduce tetrachloroethylene levels due to its volatile nature, but this method is not reliable for complete removal and may actually increase indoor air contamination. Professional filtration systems are much more effective and safer.

Q: How often should I test my water for tetrachloroethylene?
A: If you're in a high-risk area, annual testing is recommended. However, if contamination is detected, more frequent testing may be necessary to monitor treatment effectiveness and ensure continued safety.

Q: Are there any natural methods to remove tetrachloroethylene from water?
A: Unfortunately, natural methods are not effective for removing tetrachloroethylene from water. This synthetic chemical requires advanced treatment technologies such as activated carbon filtration or oxidation processes for safe removal.

Q: What should I do if my water tests positive for tetrachloroethylene?
A: Immediately stop drinking the contaminated water and switch to bottled water or an alternative safe source. Contact a water treatment professional to discuss appropriate filtration options and notify local health authorities about the contamination.