Contaminants

Limits

Sources

Lead

0.15 mg/L

Lead containing plumbing and runoff from manufacturing industries

Copper

1.3 mg/L

Mining, farming, and manufacturing

Arsenic

0.010 mg/L

Natural deposits, agriculture, and industrial runoff

Nitrate

10 mg/L

Fertilizer runoff

Nitrite

0.1 mg/L

Fertilizer runoff

Radioactive Substances

0 - 15 pCi/L

Natural deposits, fertilizer, and mining

Fluoride

4.0 mg/L

Added to water

Mercury

2.0E−5 mg/L

Natural deposits

Chlorite

1.0 mg/L

Natural Deposits

Microorganisms

0% - 5%

Natural Deposits

Viruses

0

Natural Deposits