Benzene in Drinking Water

🩨 Health Effects

Benzene is a known human carcinogen. Long-term exposure causes leukemia and anemia by damaging bone marrow. It also suppresses the immune system. There is no known safe level of benzene exposure.

📍 Sources in Water

Benzene enters water from gasoline and crude oil spills, underground storage tank leaks, industrial discharge, and natural gas operations. It is a key component of gasoline and a widely used industrial solvent.

✅ What To Do

Activated carbon filters and reverse osmosis effectively remove benzene. If your utility has benzene violations, use bottled water or a certified filter for drinking. Violations can occur from fuel spills or industrial contamination near water sources.

📜 Regulation History

The EPA set the benzene MCL at 0.005 mg/L (5 ppb) in 1987 under the Phase I Volatile Organic Chemicals rule, with an MCLG of zero due to its carcinogenicity. Benzene was among the first VOCs regulated in drinking water. The WHO guideline is 0.01 mg/L, less strict than the US standard.

🔬 How To Test Your Water

Certified lab tests for benzene cost $50-$100 using purge-and-trap gas chromatography (EPA Method 524.2). Home test kits for benzene are not readily available. If you live near a gas station, fuel storage facility, or industrial site, lab testing is the most reliable option.

💧 Which Filters Remove Benzene?

Granular activated carbon (GAC) filters are highly effective at removing benzene (NSF/ANSI 53 certified for VOC reduction). Reverse osmosis also removes benzene. Air stripping/aeration is used at the municipal level. Look for NSF/ANSI 53 certification specifically for VOC or benzene reduction.

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