Appendix 3.3 Drinking Water Standards

Current drinking water standards for human health (Colorado Dept. of Public Health and Environment, Water Quality Control Division) are listed below.

Biological

total coliform 1 org/100 ml

Inorganic

antimony 0.006 mg/L
asbestos 7 x 206 fibers/L
arsenic 0.05 mg/L
barium 2.0 mg/L
beryllium 0.004 mg/L
cadmium 0.005 mg/L
chromium 0.2 mg/L
cyanide 0.2 mg/L
fluoride 4.0 mg/L
lead 0.05 mg/L
mercury 0.002 mg/L
nickel 0.2 mg/L
nitrate 20 mg/L as N
nitrite 2.0 mg/L as N
total nitrate/nitrate 20 mg/L as N
selenium 0.05 mg/L
silver 0.05 mg/L
thallium 0.002 mg/L

Radiological

alpha emitters 25 Pci/L (excluding U and Radon)
beta and photon emiters 4 mrem/year