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TABLE 2.2 USEPA Secondary Drinking Water Standards
Contaminant Maximum contaminant level
Aluminum 0.054).2 mg/L *t
Chloride 250 mg/L
Color 15 color units
Copper 1 mg/L
Corrosivity Neither corrosive nor scale-forming
Fluoride 2.0 mg/L
Foaming agents 0.5 mg/L
Iron 0.3 mg/L
Manganese 0.05 mg/L
Odor Three threshold odor numbers
pH 6.5-8.5
Silver 0.1 mg/L
Sulfate 250 mg/L
Total dissolved solids 500 mg/L
Zinc 5 mg/L
*Selected level for aluminum depends on the discretion of the state pri-
macy agency.
*Under consideration as primary health issue.

TABLE 2.3 Future USEPA Drinking Water Regulations in Progress

Prospective maximum contaminant
Contaminant level, mg/L (except as noted)
Radon Rule
Radon 300 pCi/L
Stage 2 Disinfectants/Disinfection By-products Rule (Stage 2 D/DBPR)
Total tfihalomethanes (TTHM) 0.080*
Haloacetic acids (HAA5) 0.060*
Long-term 1 Enhanced Surface Water Treatment Rule (LT1ESWTR)--
systems under 10,000 population
Cryptosporidium
Giardia Same as IESWTR
Viruses

Long-term 2 of Enhanced Surface Water Treatment Rule (LT2ESWTR)
Cryptosporidium Treatment technique (removal
or inactivation beyond conventional
treatment)
Ground Water Rule
Viruses Treatment technology
(4.0 log inactivation)
*Four quarterly samples at four system locations including two high-TTHM sites, one high-HAA5 site, and one
other system site; compliance based on running annual average of all sites.

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