(13) EPA has established a maximum contaminant level
goal (MCLG) of zero Legionella organisms for drinking water.
(29.) 40 CFR Ch 1 [section]141.62: Maximum Contaminant Level
for Inorganic Contaminants.
"California is the first and only state in the nation to establish a maximum contaminant level
specifically for chromium-6 in drinking water," said Ron Chapman, MD, MPH, director of the California Department of Public Health in a statement.
Unlike a PWS, where a violation of the maximum contaminant level
directly affects the citizen's tap water, the connection between injection of illegal contaminant levels into the ground and pollution of tap water could be more tenuous.
A Maximum Contaminant Level
Goal (MCLG), however, is the level of a contaminant in drinking water below which there is no known or expected risk to health.
One sample contained tetrachloroethene at nine times greater than the WHO guidance values for exposure limits and 70 times the US Environmental Protection Agency maximum contaminant level
for drinking water.
In January, the allowed maximum contaminant level
for arsenic in drinking water was lowered by the US Environmental Protection Agency (EPA) from 50 to 10 parts per billion (ppb), bringing the American regulation in line with standards already promulgated by the European Union and the World Health Organization.
* Less than 1% of all drinking water systems would be affected if a maximum contaminant level
(MCL) of 20 [micro]g/L were established for perchlorate; that would rise to 4% if the MCL were set lower at 2 [micro]g/L.
The bill calls for a study by the National Academy of Sciences (NAS) to determine an "appropriate maximum contaminant level
goal for chromium 6," a substance used as a rust inhibitor and in paint pigment.
A Gerber's grape juice sample contained 6.8 parts per million fluoride, 70 percent higher than the EPA's maximum contaminant level
for drinking water.
The new standards for disinfection by-products will require improved treatment practices and a new Maximum Contaminant Level
(MCL), i.e., reductions in the amount of by-products allowable in finished drinking water.