Benzene in Drinking Water
Found in 103 water systems • vocs
Updated September 2026 • Data from EWG & EPA
What is Benzene and Why Does It Matter?
BENZENE IN YOUR TAP WATER: WHAT YOU NEED TO KNOW
What Is Benzene and How Does It Get Into Drinking Water?
Benzene is a colorless, flammable liquid that smells like gasoline. It's one of the most widely used chemicals in the United States, found in petroleum products, plastics, and industrial solvents. When benzene enters the water supply, it usually comes from leaking underground storage tanks at gas stations and refineries, industrial spills, or contamination from nearby hazardous waste sites. Benzene is highly volatile, meaning it evaporates easily — but in groundwater, it can persist for years, slowly spreading through aquifers that feed municipal water systems.
Our analysis found benzene in 103 water systems across the country, with 54 of those systems exceeding health guidelines. The average concentration was 0.414 ppb (parts per billion), though one system recorded a concerning 7.65 ppb — more than 7 times higher than the EPA's legal limit of 5 ppb.
Health Risks: How Much Exposure Is Dangerous?
The EPA set the drinking water standard for benzene at 5 ppb based on cancer risk. The Environmental Working Group (EWG), which uses more conservative health standards, recommends a guideline of 0.64 ppb. This difference matters: at the EPA limit, the estimated cancer risk is about 1 in 10,000 for lifetime exposure. At the EWG guideline, the risk drops to 1 in 100,000.
Short-term exposure to high benzene levels can cause dizziness, headaches, and tremors. Long-term exposure is the real concern. Benzene is classified as a human carcinogen (cancer-causing substance) by the International Agency for Research on Cancer. It damages bone marrow and increases the risk of leukemia and other blood cancers. Children are particularly vulnerable because their developing bodies absorb contaminants more readily, and they drink more water per pound of body weight than adults.
The EPA and EWG both agree: any level of benzene in drinking water is a risk you shouldn't accept if you can avoid it.
Regulatory Standards: The Gap Between Safety and Law
The EPA's 5 ppb limit has been in place since 1989. While this standard does prevent the most dangerous exposures, it's based on older risk assessments. The EWG updated their recommendation to 0.64 ppb in 2018 using newer toxicology data. This means water that meets EPA standards might still carry health risks the agency didn't fully account for decades ago.
Water systems are required to test for benzene and report violations to the public, but enforcement varies significantly by state. Some states actively monitor groundwater near industrial sites; others rely mainly on utility reporting.
Where Benzene Problems Are Worst
Texas leads the nation with 16 water systems exceeding guidelines, followed by Florida with 11 and Ohio with 8. New York and California each have 7 affected systems. This pattern reflects industrial history: Texas and Ohio have extensive petrochemical industries, while Florida and New York have aging infrastructure and legacy contamination from decades of industrial activity.
If you live near a gas station, oil refinery, or former industrial site, your risk is higher. Rural areas with private wells also face greater benzene risk because they lack the monitoring that municipal systems provide.
How to Remove Benzene From Your Water
Benzene removal requires specific filtration technology. Activated carbon filters are highly effective, removing up to 99% of benzene when properly maintained and replaced according to schedule. Reverse osmosis systems also work well, removing 99.9% of benzene along with other contaminants. Whole-house systems protect your entire water supply, while point-of-use filters (installed at your kitchen sink or shower) protect specific water sources.
If your water system's latest report shows benzene above 5 ppb, contact your utility immediately and install a filter. Even if levels are below the EPA limit, an activated carbon or reverse osmosis system provides the extra protection that the EWG guidelines recommend.
Regulatory Standards for Benzene
| Standard | Level | Notes |
|---|---|---|
| EWG Health Guideline | 0.15 ppb | Stricter, based on latest science |
| EPA Legal Limit (MCL) | 5 ppb | Legally enforceable standard |
| Average Detected Level | 0.41 ppb | Across all tested systems |
| Highest Detected Level | 7.65 ppb | Worst-case system |
Cities With the Highest Benzene Levels
| # | City | Detected Level | People Served |
|---|---|---|---|
| 1 | Hart, TX | 7.65 ppb | 0 |
| 2 | East Helena, MT | 3.69 ppb | 225 |
| 3 | Troup, TX | 2.84 ppb | 1,308 |
| 4 | East Helena, MT | 2.20 ppb | 400 |
| 5 | Jacinto City, TX | 1.47 ppb | 10,625 |
| 6 | Athens, TX | 1.40 ppb | 354 |
| 7 | Pittsgove, NJ | 1.39 ppb | 250 |
| 8 | Houston, TX | 1.13 ppb | 3,615 |
| 9 | Chester, WV | 1.10 ppb | 2,012 |
| 10 | New Cumberland, WV | 1.10 ppb | 1,326 |
| 11 | Signal Hill, CA | 0.88 ppb | 11,795 |
| 12 | Norwalk, CA | 0.82 ppb | 17,790 |
| 13 | Gladewater, TX | 0.81 ppb | 411 |
| 14 | Medical Lake, WA | 0.66 ppb | 195 |
| 15 | Savannah, GA | 0.61 ppb | 94 |
States Most Affected by Benzene
How to Remove Benzene From Your Water
Activated carbon effectively adsorbs benzene due to its volatile and nonpolar nature; however, effectiveness depends on contact time and carbon saturation—pitcher filters may have insufficient contact time for complete removal.
Standard pitcher filters and carbon block filters can provide some reduction of Benzene, though effectiveness varies by brand and flow rate. For maximum protection, a certified RO system is recommended.
Activated carbon is effective for benzene, but point-of-use systems require proper sizing and regular replacement; whole-house activated carbon or reverse osmosis provides more reliable removal.
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Shop Hydrogen FlaskFrequently Asked Questions
Is Benzene in my drinking water?
Benzene was detected in 103 water systems across the US. Check your city's water quality report to see if it affects your water supply.
What are the health effects of Benzene in water?
Benzene has been associated with various health concerns at elevated levels. The EWG has set health guidelines that are typically stricter than EPA legal limits.
Which city has the most Benzene in its water?
Based on our analysis, Hart, TX has the highest detected levels of Benzene in its water supply.
How do I remove Benzene from my water?
Reverse osmosis (RO) systems are generally the most effective at removing this contaminant. Check the filtration recommendations section for specific guidance.
Related Contaminant Guides
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: September 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
