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Public Drinking Water Standards for Ohio

Revision Date: September 26, 2005

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
II. SECONDARY STANDARDS FOR OHIO PUBLIC WATER SUPPLIES (Ohio Administrative Code; Chapter 3745-82)
PARAMETER Secondary Maximum Contaminant Level - SMCL
1. Aluminum 0.05 to 0.2 mg/l
2. Chloride 250 mg/l
3. Color 15 color units
4. Corrosivity non-corrosive
5. Fluoride 2.0 mg/l
6. Iron 0.3 mg/l
7. Manganese 0.05 mg/l
8. Odor 3 threshold odor number
9. pH 7.0-10.5
10. Silver 0.1 mg/l
11. Sulfates 250 mg/l
12. Total Dissolved Solids (TDS) 500 mg/l
13. Zinc 5 mg/l
14. Foaming Agents 0.5 mg/l

* Based on calculated levels for 168 possible contaminants

ABBREVIATIONS:

  • mg/L - milligrams per liter (parts per million - ppm) = 1,000 ug/L
  • NTU - nephelometric turbidity units
  • pCi/L - picocurie per liter
  • ug/L - micrograms per liter (parts per billion - ppb)
  • um - micrometers
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