|
Trihalomethanes (THMs) are disinfection byproducts created
when chlorine is used to disinfect water containing natural organic
matter.
Although some studies have indicated an association between elevated levels of THMs and adverse health effects among pregnant women, no causal relationship has been established.
The Environmental
Protection Agency (EPA) maximum contaminant level of total THMs
in treated water is 0.08 milligrams per liter. Southern Nevada's municipal water supply meets that health-based standard. The Southern Nevada Water Authority encourages the EPA to continue health effects research so it can provide water agencies the information necessary to minimize health risks associated with THMs.
Several factors affect THM formation, including
the amount of chlorine used during treatment, the concentration
of total organic carbons in the source water, temperature, pH and
retention time in the system.
The Southern Nevada Water Authority, which treats
the valley's water supply, takes proactive measures to manage the
formation of THMs during the water treatment process.
While science has not established a causal relationship
between THMs and adverse health affects among pregnant women, the
Water Authority advises consumers—particularly pregnant women—to
call the EPA's Safe Drinking Water Hotline at (800) 426-4791 about any concerns related to THMs.
|
