I. PRIMARY STANDARDS FOR OHIO PUBLIC WATER SUPPLIES (Ohio Administrative Code; Chapter 3745-81) |
INORGANIC |
Maximum Contaminant Level - MCL (mg/l) |
Antimony |
0.006 |
Arsenic |
0.010 (effective 1/1/06; 0.05 until 12/31/05) |
Asbestos |
7 million fibers/liter (longer than 10 um) |
Barium |
2 |
Beryllium |
0.004 |
Cadmium |
0.005 |
Chromium |
0.1 |
Cyanide |
0.2 |
Fluoride |
4.0 |
Mercury |
0.002 |
Nitrate (as N) |
10 |
Nitrate-Nitrite (as N) |
10 |
Nitrite (as N) |
1 |
Selenium |
0.05 |
Thallium |
0.002 |
PESTICIDES AND OTHER ORGANIC CHEMICALS (SOCs) |
Maximum Contaminant Level - MCL (mg/l) |
Alachlor |
0.002 |
Aldicarb |
0.007 (proposed) |
Aldicarb sulfone |
0.007 (proposed) |
Aldicarb sulfoxide |
0.007 (proposed) |
Atrazine |
0.003 |
Benzo-a-pyrenes |
0.0002 |
Carbofuran |
0.04 |
Chlordane |
0.002 |
2,4-D |
0.07 |
Dalapon |
0.2 |
Di(2-ethylhexyl)adipate |
0.4 |
Di(2-ethylhexyl)phthalate |
0.006 |
Dibromochloropropane (DBCP) |
0.0002 |
Dinoseb |
0.007 |
Diquat |
0.02 |
Endothall |
0.1 |
Endrin |
0.002 |
Ethylene dibromide (EDB) |
0.00005 |
Glyphosate |
0.7 |
Heptachlor |
0,0004 |
Heptachlor epoxide |
0,0002 |
Hexachlorobenzene |
0.001 |
Hexachlorocyclopentadiene |
0.05 |
Lindane |
0.0002 |
Methoxychlor |
0.04 |
Oxamyl (Vydate) |
0.2 |
Pentachlorophenol |
0,001 |
Picloram |
0,5 |
Polychlorinated Biphenyls (PCB's) |
0,0005 |
Simazine |
0,004 |
2,3,7,8-TCDD (Dioxin) |
3x10-8 |
2,4,5-TP (Silvex) |
0,05 |
Toxaphene |
0.003 |
ORGANIC DISINFECTION BYPRODUCTS (DBPs) |
Maximum Contaminant Level - MCL (mg/l) |
Total Trihalomethanes (TTHMs): The sum of the concentrations of Bromodichloromethane, Dibromochloromethane, Bromoform, and Chloroform |
0.080 |
Five Haloacetic Acids (HAA5): The sum of the concentrations of Monochloroacetic acid, Dichloroacetic acid, Trichloroacetic acid, Monobromoacetic acid, and Dibromoacetic acid |
0.060 |
INORGANIC DISINFECTION BYPRODUCTS (DBPs) |
Maximum Contaminant Level - MCL (mg/l) |
Bromate |
0.010 |
Chlorite |
1.0 |
DISINFECTANT RESIDUALS (Distribution System) |
Minimum Level Needed for Compliance (mg/l) Required for Free Chlorine or Combined Chlorine |
Free Chlorine: Surface Water System |
not less than 0.2 mg/l in more than 5% samples per month (not less than 0.2 mg/l for more than 4 consecutive hours) |
Combined Chlorine: Surface Water System |
not less than 1 mg/l in more than 5% samples per month (not less than 1 mg/l for more than 4 consecutive hours) |
Free Chlorine: (Ohio Administrative Code; Chapter 3745-83) Ground Water System - Community and major Non-Community |
at least 0.2 mg/l (unless exempted by the Director) |
Combined Chlorine: (Ohio Administrative Code; Chapter 3745-83) Ground Water System - Community and major Non-Community |
at least 1 mg/l (unless exempted by the Director) |
DISINFECTANT RESIDUALS (Distribution System) |
Maximum Residual Disinfectant Level - MRDL (mg/l) |
Total Chlorine (as Cl2) |
4.0 |
Chlorine Dioxide (as ClO2) |
0.8 |
VOLATILE ORGANIC CHEMICALS (VOCs) |
Maximum Contaminant Level - MCL (mg/l) |
Benzene |
0.005 |
Carbon tetrachloride |
0.005 |
cis-1,2-Dichloroethylene |
0.07 |
Dichloromethane |
0.005 |
1,1-Dichloroethylene |
0.007 |
1,2-Dichloroethane |
0.005 |
1,2-Dichloropropane |
0.005 |
Ethylbenzene |
0.7 |
Monochlorobenzene |
0.1 |
o-Dichlorobenzene |
0.6 |
para-Dichlorobenzene |
0.075 |
Styrene |
0.1 |
Tetrachloroethylene |
0.005 |
Toluene |
1 |
trans-1,2-Dichloroethylene |
0.1 |
Trichloroethylene |
0.005 |
1,1,1-Trichloroethane |
0.2 |
1,2,4-Trichlorobenzene |
0.07 |
1,1,2-Trichloroethane |
0.005 |
Vinyl Chloride |
0.002 |
Xylenes (total) |
10 |
RADIOLOGICAL |
Maximum Contaminant Level - MCL (pCi/l) |
Beta particle and photon radioactivity |
4 mrem/yr* |
Combined Radium-226 and Radium-228 |
5 |
Gross Alpha particle activity (including Radium-226 but excluding Radon and Uranium) |
15 |
Uranium |
30 ug/L |
MICROBIOLOGY (Total Coliform) |
COLIFORM RESULTS (compliance) |
1. Public water supplies monitoring at least 40 samples per month |
no more than 5% coliform positives per month |
2. Public water supplies monitoring fewer than 40 samples per month |
no more than 1 coliform positive per month |
|
COLIFORM RESULTS (non-compliance) |
3. Public water supplies with any positive repeat samples |
Coliform violation |
4. Public water supplies failing to monitor for repeat samples |
Coliform violation |
TURBIDITY (Finished Water) |
Maximum Contaminant Level - MCL (pCi/l) |
1. Conventional Filtration or Alternative Filtration Technology: Combined population less than 10,000 |
less than or equal to 0.5 NTU in at least 95% of samples per month and shall not exceed 5 NTU |
2. Conventional Filtration or Alternative Filtration Technology: Combined population equal to or greater than 10,000 |
less than or equal to 0.3 NTU in at least 95% of samples per month and shall not exceed 1 NTU |
3. Slow Sand Filtration |
less than or equal to 1 NTU in at least 95% of samples per month and shall not exceed 5 NTU |
Lead and Copper Action Level |
Action Level |
1. Lead |
exceeded if lead greater than 0.015 mg/l is detected in more than 10% of tap samples in a compliance period |
2. Copper |
exceeded if copper greater than 1.3 mg/l is detected in more than 10% of tap samples in a compliance period |