Baseline Testing Less Common Parameters with and without Standards

Elements with or without EPA Drinking Water Standards

Antimony- The EPA primary drinking water limit of 0.006 mg/L.

http://water.epa.gov/drink/contaminants/basicinformation/antimony.cfm

Cobalt - The PA Statewide Health Standard Guidance for Brownfields - recommends a Cobalt concentration of less than 0.011 mg/L for residential areas with a total dissolved solids of 2500 mg/L. (Source: “Pocket Guide to Statewide Health Standards, January 2011).

Additional Information on Cobalt - http://www.atsdr.cdc.gov/tfacts33.pdf

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.

http://www.who.int/water_sanitation_health/dwq/chemicals/silver.pdf

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).

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/L
http://oehha.ca.gov/water/pals/vanadium.html

A Well by Well - Review of the Data for Dimock, PA collected by EPA