Antimony- The EPA primary drinking water limit of 0.006 mg/L.
Molybdenum - No specific drinking water standard, but the WHO recommends a level of less than 0.07 mg/L and in Wisconsin the standard is 0.040 mg/L.
http://www.who.int/water_sanitation_health/dwq/chemicals/molybdenum.pdf
http://www.dhs.wisconsin.gov/eh/hlthhaz/fs/MolybdenumDrinkingWater.pdf
Nickel - EPA Suggested a Maximum Contaminant Level of 0.1 mg/L
http://www.epa.gov/ogwdw/pdfs/factsheets/ioc/tech/nickel.pdf
Silver - < 0.05 mg/L Maine and < 0.1 mg/L (World Health Organization)
Amounts of silver in drinking water over the drinking water
standard of 0.05 milligrams per liter may cause a permanent blue-gray
discoloration of eyes, skin and mucous membranes.
Thallium – The EPA primary drinking water limit of 0.002
mg/L.
http://water.epa.gov/drink/contaminants/basicinformation/thallium.cfm
Thorium - The EPA has set a drinking water limit of 15 picocuries per liter (15 pCi/L) of water for gross alpha particle activity and 4 millirems per year for beta particles and photon activity (for example, gamma radiation and x-rays).
Thorium - The EPA has set a drinking water limit of 15 picocuries per liter (15 pCi/L) of water for gross alpha particle activity and 4 millirems per year for beta particles and photon activity (for example, gamma radiation and x-rays).
http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=659&tid=121
http://www.lenntech.com/periodic/elements/th.htm
Vanadium - Action Level in California at 0.050 mg/L - inform public at 0.015 mg/Lhttp://www.lenntech.com/periodic/elements/th.htm
http://oehha.ca.gov/water/pals/vanadium.html
A Well by Well - Review of the Data for Dimock, PA collected by EPA
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