Contaminant

MCLG 1
(mg/L) 2

MCL or TT 1
(mg/L) 2

Potential Health Effects from Ingestion of Water

Sources of Contaminant in Drinking Water

Alpha particles

none 7
----------
zero

15 picocuries per Liter (pCi/L)

Increased risk of cancer

Erosion of natural deposits of certain minerals that are radioactive and may emit a form of radiation known as alpha radiation

Beta particles and photon emitters

none 7
----------
zero

4 millirems per year

Increased risk of cancer

Decay of natural and man-made deposits of certain minerals that are radioactive and may emit forms of radiation known as photons and beta radiation

Radium 226 and Radium 228 (combined)

none 7
----------
zero

5 pCi/L

Increased risk of cancer

Erosion of natural deposits

Uranium

zero

30 ug/L as of 12/08/03

Increased risk of cancer, kidney toxicity

Erosion of natural deposits