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| Microbial and Turbidity | ||||
| Contaminants |
MCLG* |
MCL** |
|
Treatment
Methods |
| Turbidity | - |
0.5
to 1 NTU in 95% of samples; maximum of 5 NTU under certain circumstances |
Coagulation/Filtration |
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| Coliform bacteria | zero |
zero
in 95% of samples |
Turbidity
reduction to 1 NTU and then: |
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| Fecal coliform | zero |
zero |
Ozone Iodine (e.g., Polyiodide Resins) |
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| E. coli | zero |
zero |
Submicron
(absolute) Filtration ([] 0.45 micron) |
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| Enteric viruses | zero |
99.99%
reduction or inactivation |
Turbidity
Reduction to 1 NTU and then: |
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| Giardia lamblia and Cryptosporidium cysts | zero |
99.9%
reduction of inactivation |
Turbidity
Reduction to 1 NTU and then: Chemical Oxidation/Disinfection Chlorination Ozone Iodine Absolute Filtration of less than 3 microns sized particles Distillation |
|
(P)* = Proposed Standard MCLG* = Maximum Contaminant Level Goal established at the level at which no known or anticipated adverse effects on the health of persons occur and which allows an adequate margin of safety; expressed in milligrams per liter unless otherwise specified. MCL** = Maximum Contaminant Level established as close to the MCLG as feasible taking into consideration costs and treatment techniques applicable at public water systems; expressed in milligrams per liter unless otherwise specified. |
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