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MCLs

If you would like a printable copy of the MCLs listed above, you can save the picture, or for easier use, click on the picture and save the associated Adobe PDF file to print as you wish.  Remember to print the PDF file in LANDSCAPE orientation for best presentation.

Maximum Contaminant Levels
Safe Drinking Water Levels of Specific Contaminants
Listed below are some of the established Maximum Contaminant Levels published by the United States Environmental Protection Agency, adopted by the State of Pennsylvania and enforced by the Pennsylvania Department of Environmental Protection.  The same standards are adopted by numerous other States as part of the Federal Drinking Water Program(s).  IT SHOULD BE NOTED AND UNDERSTOOD that these standards are published for public water systems, not individual home water supply systems.  Public water systems are monitored on a regular basis over regular intervals of time for these parameters.  Simple, single samples do not reflect the overall condition of water systems over time.  They only give a picture of that one sample.  Caution should be exercised when applying such results to, and forming conclusions about, water systems (from which a single sample is taken and no regular monitoring has been done).  Water quality may vary with time, season, use, weather and water table level, as well as due to many other factors.
For quick relocation on this page, pick the category of contaminant for which you wish to view MCL standards, or you may scroll through the entire list slowly.  The basic groups are listed below:
Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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                                          Microbiological
Total Coliform                                              0 per 100 ml
Fecal Coliform (or E. Coli )                           0 per 100 ml
 

                                  Turbidity
         Turbidity                                                        
1 NTU

 

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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                                   Inorganic Chemicals

Metals

Antimony                                                                 6  ug/l
Arsenic                                                                  15  ug/l
Barium                                                              2,000  ug/l
Beryllium                                                                 4   ug/l
Cadmium                                                                 5  ug/l
Chromium                                                            100  ug/l
Copper (Vended and Bulk)                               1,000  ug/l
Copper (Copper and Lead Rule)                       1,300  ug/l
Lead (Vended and Bulk)                                          5  ug/l
Lead (Copper and Lead Rule)                                15  ug/l
Mercury                                                                   2  ug/l
Niclel                                                        Not Established
Selenium                                                                 50  ug/l
Thallium                                                                    2  ug/l

Non-metals
Cyanide (free CN)                                                200  ug/l
Fluoride                                                             2,000  ug/l  (2.0 mg/l)
Nitrate (as N)                                                  10,000  ug/l  (10.0 mg/l)
Nitrite (as N)                                                     1,000  ug/l  (1.0 mg/l)
Nitrate + Nitrite (as N)                                    10,000  ug/l  (10.0 mg/l)
Asbestos       7 million fibers longer than 10um/l

 

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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Volatile Organic Chemicals (VOC's)

Benzene                                                                   5  ug/l
Carbon Tetrachloride                                               5  ug/l
o-Dichlorobenzene                                               600  ug/l
p-Dichlorobenzene                                                 75  ug/l
1,2 Dichloroethane                                                   5  ug/l
1,1 Dichloroethene                                                   7  ug/l
cis-1,2 Dichloroethene                                           70  ug/l
trans-1,2 Dichloroethene                                      100  ug/l
Methylene Chloride                                                  5  ug/l
1,2 Dichloropropane                                                5  ug/l
Ethylbenzene                                                        700  ug/l
(Mono) Chlorobenzene                                        100  ug/l
Styrene                                                                100  ug/l
Tetrachloroethene (PCE)                                          5  ug/l
Toluene                                                             1,000  ug/l  (1.0 mg/l)
1,2,4 Trichlorobenzene                                           70  ug/l
1,1,1 Trichloroethane                                           200   ug/l
1,1,2 Trichloroethane                                               5   ug/l
Trichloroethene (TCE)                                             5   ug/l
Vinyl Chloride                                                          2  ug/l
Xylenes (o-m-p Total)                                     10,000  ug/l  (10.0 mg/l)

 

Total  Trihalomethanes

Chloroform, Chlorodibromomethane,
Bromoform, Bromodichloromethane 
Total of all above                                                  80  ug/l

 

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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Synthetic Organic Chemicals SOC's

Alachlor                                                            2       ug/l
Atrazine                                                            3       ug/l
Benzo(a)Pyrene                                                0.2     ug/l
Carbofuran                                                     40        ug/l
Chlordane                                                        2        ug/l
2,4 D                                                             70        ug/l
Dalapon                                                       200        ug/l
Dibromochloropropane (DBCP)                         0.2    ug/l
Di (2 Ethylhexyl) Adipate                              400        ug/l
Di (2-Ethylhexyl) Phthalate                               6       ug/l
Dinoseb                                                           7       ug/l
Diquat                                                               20       ug/l
Endothall                                                         100       ug/l
Endrin                                                                 2       ug/l
Ethylene Dibromide                                            0.05  ug/l
Glyphosate                                                     700        ug/l
Heptachlor                                                         0.4     ug/l
Heptachlor Epoxide                                            0.2     ug/l
Hexachlorobenzene                                             1        ug/l
Hexachlorocyclopentadiene                               50        ug/l
Lindane                                                               0.2     ug/l
Methoxychlor                                                    40        ug/l
Oxamyl (Vydate)                                             200        ug/l
PCB's                                                                0.5     ug/l
Pentachlorophenol                                              1        ug/l
Picloram                                                         500        ug/l
Simazine                                                             4        ug/l
2,3,7,8 TCDD (Dioxin)                            3 x 10-5       ug/l
Toxaphene                                                          3        ug/l
2,4,5 TP (Silvex)                                               50        ug/l

 

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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                      Radionuclides

Gross Alpha                                                           15  pCi/l
Combined Radium (226 & 228)                               5  pCi/l
Beta Particle & Photon Activity                                 4  mrem/yr
Radon (Ra)                                                              Not Established
The Gross Alpha MCL excludes Ra and U.
The Beta MCL is for man-made radionuclides.

 

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
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Secondary Contaminants (mg/l)

Aluminum                                                             0.2   mg/l
Chloride                                                           250      mg/l
Color                                                                 15 Color Units
Corrosivity                                                           Non-corrosive
Foaming Agents                                                   0.5   mg/l
Iron                                                                      0.3   mg/l
Manganese                                                           0.05 mg/l
Odor   (Threshold Odor Number)                        3
pH                                                                         6.5 - 8.5
Silver                                                                   0.1   mg/l
Sulfate                                                             200      mg/l
Total Dissolved Solids                                      500      mg/l
Zinc                                                                     5      mg/l

NOTE: Values above are mg/l not ug/l.    1 mg/l is equal to 1,000 ug/l.

Microbiological, Turbidity, Inorganics (metals and others),
Volatile Organic Compounds (Solvents etc), Trihalomethanes (part of VOC's), Synthetic Organic Compounds (Herbicides/Pesticides and others), Radionuclides, Secondary Contaminants (Non-health items),
or Back to top of the Page