EPA legal limit
5 ppb
Maximum Contaminant Level
EWG health guideline
0.1 ppb
Science-based, stricter target
IARC classification
Group 1
Cancer research classification
Health effects
Classified as a known human carcinogen (IARC Group 1). Associated with kidney cancer, non-Hodgkin's lymphoma, and liver cancer. Neurological and reproductive effects at lower concentrations. The EPA MCL of 5 ppb is 50× higher than the EWG health guideline of 0.1 ppb.
Where it comes from
Industrial degreasing operations, dry cleaning, manufacturing facilities, and legacy contamination at military bases. TCE evaporates readily and can enter homes through soil vapour intrusion from contaminated groundwater.
How it's regulated
EPA MCL of 5 ppb. Listed as a known human carcinogen by NTP and IARC. Found at elevated levels near industrial sites and military installations.
The EPA vs EWG gap
The legal limit (5 ppb) is 50× higher than the EWG health guideline (0.1 ppb). Water can be legally compliant while still exceeding the science-based threshold.
How to filter trichloroethylene
Not all filters address trichloroethylene. Look for independently certified filters—NSF International certification means the removal claim has been independently verified.
Frequently asked questions
What is trichloroethylene?
An industrial solvent used in metal degreasing and manufacturing. One of the most commonly found volatile organic compounds (VOCs) in U.S. groundwater. Found at many EPA Superfund sites.
What are the health effects of trichloroethylene?
Classified as a known human carcinogen (IARC Group 1). Associated with kidney cancer, non-Hodgkin's lymphoma, and liver cancer. Neurological and reproductive effects at lower concentrations. The EPA MCL of 5 ppb is 50× higher than the EWG health guideline of 0.1 ppb.
Is trichloroethylene regulated in drinking water?
EPA MCL of 5 ppb. Listed as a known human carcinogen by NTP and IARC. Found at elevated levels near industrial sites and military installations.
Where does trichloroethylene come from?
Industrial degreasing operations, dry cleaning, manufacturing facilities, and legacy contamination at military bases. TCE evaporates readily and can enter homes through soil vapour intrusion from contaminated groundwater.
How do I remove trichloroethylene from tap water?
The most effective methods for removing trichloroethylene are: Activated carbon block filter, NSF 53 certified filter, Reverse osmosis (RO), NSF 58 certified RO system. Look for NSF-certified systems—independent certification confirms removal claims have been verified.
Is trichloroethylene in your water?
Enter your ZIP code to see the measured level in your specific utility.