Drinking Water Contaminants Removal List
Containment
| Average Reduction Rate with Reverse Osmosis | MCL (mg/L) |
|---|---|---|
Aluminum |
99.0% | 0.05-0.2 |
Ammonium |
99.0% | 10.0 |
Arsenic |
98.7% | 0.05 |
Asbestos |
99.0% | 7 million filbers/liter |
Barium |
99.0% | 2.0 |
Bacteria |
99.0% | <500 bacterial colonies per milliliter |
Cadmium |
99.0% | 0.005 |
Chloramine |
90.0% | MRDLG=44 |
Chloride |
99.9% | 250 |
Chlorine |
99.9% | TT3 |
Chromate |
99.0% | TT3 |
Chromium (Hexavalent) |
98.6% | 0.1 |
Chromium (Trivalent) |
99.8% | 0.1 |
Copper** |
99.0% | 1.3 |
Criptosporidium Cysts |
99.0% | Zero |
Cyanide |
95.0% | 0.2 |
DDT |
>99.9% | 0.05 |
E. Coli Bacteria |
>99.0% | Zero |
Fecal Bacteria |
>99.0% | Zero |
Fluoride |
95.0% | 4.0 |
Iron |
99.0% | 1.0 |
Lead |
99.0% | 0.015 |
Lindane |
>99.9% | 0.0002 |
Magnesium |
99.0% | MRDLG=44 |
Manganese |
99.0% | 0.15 |
Mercury |
99.0% | 0.002 |
Nickel |
99.0% | 0.1 |
PCBs |
>99.9% | 0.0005 |
Potassium |
92-99% | UR |
Sediment |
99.9% | TT3 |
Selenium |
99.4% | 0.05 |
Silica |
98.0% | UR |
Silver |
99.0% | 0.05 |
Sodium |
99.0% | MRDLG=44 |
Sulfate |
99.0% | 250 |
Toluane |
>99.9% | 1.0 |
Turbidity |
99.0% | TT3 |
Nitrate |
88.8% | 10.0 |
Nitrite |
86.3% | 1.0 |
Zinc |
99.0% | 5.0 |
Other contaminants also reduced by up to 99.9%: Bicarbonate, Calcium, Copper Sulfate CuSO4, Ferro cyanide, Giardia cysts, Glucose, Lactic acid pH5, Magnesium chlorid, Nickel, Nickel Sulfate NiSO4, Phosphate, Prosphate, Protozoa, Salmonella typhimurium, Serratia marcescens, Shigella dysenteriae, Silicate, Sodium Chloride NaCl, Sodium fluoride, Sodium Nitrate NaNO3, Strontium, Sucrose, Sulfite, Thiosulfate, and Vibrio cholerae.
* Maximum Contaminant Level (MCL) - The highest level of a contaminant that is allowed in drinking water. MCLs are enforceable standards. MCLs are set as close to the MCLGs as feasible using the best available treatment technology.
2. Units are in milligrams per liter (mg/L) unless otherwise noted. Milligrams per liter are equivalent to parts per million (ppm).
3. TT (Treatment Technique) - A required process intended to reduce the level of a contaminant in drinking water.
- Turbidity: At no time can turbidity (cloudiness of water) go above 5 nephelolometric turbidity units (NTU); systems that filter must ensure that the turbidity go no higher than 1 NTU (0.5 NTU for conventional or direct filtration) in at least 95 percent of the daily samples in any month.
4. MRDLG (Maximum Residual Disinfectant Level Goal) - The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants.
- More than 5.0% samples total coliform-positive in a month. (For water systems that collect fewer than 40 routine samples per month, no more than one sample can be total coliform-positive per month.) Every sample that has total coliform must be analyzed for either fecal coliforms or E. coli if two consecutive TC-positive samples, and one is also positive for E.coli fecal coliforms, system has an acute MCL violation.
**Copper is regulated by a Treatment Technique (TT) that requires systems to control the corrosiveness of their water. If more than 10 percent of tap water samples exceed the action level, water system must take additional steps. For copper, the action level is 1.3 mg/L.
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