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Ohio Administrative Code (Last Updated: January 12, 2021) |
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3745 Ohio Environmental Protection Agency |
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Chapter3745-81. Primary Drinking Water Rules |
3745-81-12. Maximum contaminant levels and best available technologies for organic contaminants
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(A) The director may determine that a public water system shall apply the following best available technology (BAT), for achieving compliance with the maximum contaminant levels (MCLs) for organic disinfection byproducts identified in this table :
Contaminant
MCL (mg/L)
BAT
Total trihalomethanes
0.080
Enhanced coagulation or enhanced softening plus GAC10; or nanofiltration with a molecular weight of less than or equal to 1000 Daltons; or GAC20
Haloacetic acids (five)
0.060
Enhanced coagulation or enhanced softening plus GAC10; or nanofiltration with a molecular weight of less than or equal to 1000 Daltons; or GAC20
(B) The director may determine that a public water system shall apply the following best technology, treatment techniques or other means available for achieving compliance with the MCLs for TTHM and HAA5 identified in this rule for consecutive systems and applies only to the disinfected water that consecutive systems buy or otherwise receive:
Contaminant
MCL (mg/L)
BAT
Total trihalomethanes
0.080
Systems serving greater than or equal to 10,000: Improved distribution system and storage tank management to reduce residence time, plus the use of chloramines for disinfectant residual maintenance. Systems serving less than 10,000: Improved distribution system and storage tank management to reduce residence time.
Haloacetic acids (five)
0.060
Systems serving greater than or equal to 10,000: Improved distribution system and storage tank management to reduce residence time, plus the use of chloramines for disinfectant residual maintenance. Systems serving less than 10,000: Improved distribution system and storage tank management to reduce residence time.
(C) The following maximum contaminant levels (MCLs) apply to community public water systems and nontransient noncommunity public water systems. The associated BATs, designated as GAC for granular activated carbon and PTA for packed-tower aeration, identify the best technology, treatment techniques or other means available for achieving compliance with the stated MCLs. The director may determine that a public water system shall apply best available technology in order to reduce the level of a contaminant to below its MCL.
Contaminant
CAS number
MCL (mg/L)
BAT
Vinyl chloride
75-01-4
0.002
PTA
Benzene
71-43-2
0.005
GAC PTA
Carbon tetrachloride
56-23-5
0.005
GAC PTA
p-Dichlorobenzene
106-46-7
0.075
GAC PTA
1,2-Dichloroethane
107-06-2
0.005
GAC PTA
1,1-Dichloroethylene
75-35-4
0.007
GAC PTA
Trichloroethylene
79-01-6
0.005
GAC PTA
1,1,1-Trichloroethane
71-55-6
0.2
GAC PTA
o-Dichlorobenzene
95-50-1
0.6
GAC PTA
cis-1,2-Dichloroethylene
156-59-2
0.07
GAC PTA
trans-1,2-Dichloroethylene
156-60-5
0.1
GAC PTA
1,2-Dichloropropane
78-87-5
0.005
GAC PTA
Dichloromethane
75-09-2
0.005
PTA
Ethylbenzene
100-41-4
0.7
GAC PTA
Monochlorobenzene
108-90-7
0.1
GAC PTA
Styrene
100-42-5
0.1
GAC PTA
Tetrachloroethylene
127-18-4
0.005
GAC PTA
Toluene
108-88-3
1
GAC PTA
1,2,4-Trichlorobenzene
120-82-1
0.07
GAC PTA
1,1,2-Trichloroethane
79-00-5
0.005
GAC PTA
Xylenes (total)
1330-20-7
10
GAC PTA
(D) The following maximum contaminant levels apply to community public water systems and nontransient noncommunity water systems. The associated BATs, designated as GAC for granular activated carbon, PTA for packed-tower aeration, and OX for oxidation with chlorine or ozone, identify the best technology, treatment technique or other means available for achieving compliance with the stated MCLs. The director may determine that a public water system shall apply BAT in order to reduce the level of a contaminant to below its MCL.
Contaminant
CAS number
MCL (mg/L)
BAT
Alachlor
15972-60-8
0.002
GAC
Atrazine
1912-24-9
0.003
GAC
Benzo[a]pyrene
50-32-8
0.0002
GAC
Carbofuran
1563-66-2
0.04
GAC
Chlordane
57-74-9
0.002
GAC
2,4-D
94-75-7
0.07
GAC
Dalapon
75-99-0
0.2
GAC
Dibromochloropropane (DBCP)
96-12-8
0.0002
GAC PTA
Di(2-ethylhexyl) adipate
103-23-1
0.4
GAC
Di(2-ethylhexyl) phthalate
117-81-7
0.006
GAC
Dinoseb
88-85-7
0.007
GAC
Diquat
85-00-7
0.02
GAC
Endothall
145-73-3
0.1
GAC
Endrin
72-20-8
0.002
GAC
Ethylene dibromide (EDB)
106-93-4
0.00005
GAC PTA
Glyphosate
1071-53-6
0.7
OX
Heptachlor
76-44-8
0.0004
GAC
Heptachlor epoxide
1024-57-3
0.0002
GAC
Hexachlorobenzene
118-74-1
0.001
GAC
Hexachlorocyclopentadiene
77-47-4
0.05
GAC PTA
Lindane
58-89-9
0.0002
GAC
Methoxychlor
72-43-5
0.04
GAC
Oxamyl (Vydate)
23135-22-0
0.2
GAC
Picloram
1918-02-1
0.5
GAC
Polychlorinated biphenyls (PCBs)
1336-36-3
0.0005
GAC
Pentachlorophenol
87-86-5
0.001
GAC
Simazine
122-34-9
0.004
GAC
2,3,7,8-TCDD (Dioxin)
1745-01-6
3 x 10-8
GAC
Toxaphene
8001-35-2
0.003
GAC
2,4,5-TP (Silvex)
93-72-1
0.05
GAC