Rule 3745-1-33. Water quality criteria for water supply use designations

119.03 [Comment: For dates of non-regulatory government publications, publications of recognized organizations and associations, federal rules and federal statutory provisions referenced in this rule, see rule 3745-1-03 of the Administrative Code.] (A) Human health water quality criteria [public water supply]. (1) The chemical specific criteria listed in table 33-1 of this rule, or site-specific modifications thereof, apply as "Outside Mixing Zone Averages" and shall apply to all water bodies located within five hundred yards of drinking water intakes. For the purpose of setting water quality based effluent limits, these criteria shall be met after the effluent and the receiving water are reasonably well mixed as provided in rules 3745-1-06 and 3745-2-05 of the Administrative Code. (2) Water bodies located within the Ohio river drainage basin. Any methodologies and procedures acceptable under 40 C.F.R. 131, effective July 1, 2019 may be used when developing or revising human health water quality criteria or implementing narrative criteria contained in rule 3745-1-04 of the Administrative Code. For any pollutant for which it is demonstrated that a methodology or procedure cited in this rule is not scientifically defensible, the director may apply an alternative methodology or procedure acceptable under 40 C.F.R. 131 when developing water quality criteria. (3) Water bodies located within the lake Erie drainage basin. The methodologies contained in rules 3745-1-41 and 3745-1-42 of the Administrative Code shall be used when adopting or revising numeric human health criteria and when implementing the narrative water quality criteria contained in rule 3745-1-04 of the Administrative Code. For pollutants listed in table 33-2 of this rule, any methodologies and procedures acceptable under 40 C.F.R. 131 may be used when developing water quality criteria or implementing narrative criteria. For any pollutant other than those in table 33-2 of this rule, for which it is demonstrated that a methodology or procedure cited in this rule is not scientifically defensible, the director may apply an alternative methodology or procedure acceptable under 40 C.F.R. 131 when developing water quality criteria. Table 33-1. Water quality criteria for the protection of human health [public water supply]. OMZA 3 Chemical Form 1 Units 2 Drinking Ohio river Lake Erie Acenaphthene T µg/l 70 Acrolein T µg/l 3.0 Acrylonitrile 5 T µg/l 0.51 Alachlor T µg/l 2.0 a 2.0 a Aldrin 5 T µg/l 7.7*10 -6 Anthracene T µg/l 300 Antimony 5 TR µg/l 5.6 6.0 a Arsenic TR µg/l 10 a 10 a Asbestos T Mf/l 7.0 a 7.0 a Atrazine T µg/l 3.0 a 3.0 a Barium 5 TR µg/l 1,000 2,000 a Benzene 5 T µg/l 5.0 a 5.0 a Benzidine 5 T µg/l 0.00086 Benzo(a)anthracene 5 T µg/l 0.012 0.2 a Benzo(a)pyrene 5 T µg/l 0.0012 Benzo(b)fluoranthene 5 T µg/l 0.012 Benzo(k)fluoranthene 5 T µg/l 0.038 Beryllium TR µg/l 4.0 a 4.0 a Bromate T µg/l 10 a 10 a Bromoform (Tribromomethane) 5 T µg/l 43 Butylbenzyl phthalate T µg/l 0.10 Cadmium TR µg/l 5.0 a 5.0 a Carbofuran T µg/l 40 a 40 a Carbon tetrachloride 5 T µg/l 2.3 5.0 a Chloramine T µg/l 4,000 a 4,000 a Chlordane 5 T µg/l 0.0031 0.00025 Chlorides T mg/l 250 a 250 a Chlorine T µg/l 4,000 a 4,000 a Chlorine dioxide T µg/l 800 a 800 a Chlorite T µg/l 1,000 a 1,000 a Chloroacetic acid 6 T µg/l 60 a 60 a Chlorobenzene T µg/l 100 a 100 a Chlorodibromomethane 5 T µg/l 4.0 Bis(2-Chloro-1-methylethyl) ether T µg/l 200 Bis(2-Chloroethyl)ether 5 T µg/l 0.30 Chloroform 5 T µg/l 57 bis(2-Chloroisopropyl)ether T µg/l 1,400 bis(2-Chloromethyl)ether 5 T µg/l 0.0015 2-Chloronaphthalene T µg/l 800 2-Chlorophenol T µg/l 30 Chromium TR µg/l 100 a 100 a Chrysene 5 T µg/l 0.038 Cyanide free µg/l 4.0 4.0 2,4-D (2,4-Dichlorophenoxy-acetic acid) T µg/l 70 a 70 a Dalapon T µg/l 200 a 200 a 4,4'-DDD 5 T µg/l 0.0012 4,4'-DDE 5 T µg/l 0.00018 4,4'-DDT 5 T µg/l 0.0003 0.00015 Dibenzo(a,h)anthracene 5 T µg/l 0.0012 Dibromochloropropane T µg/l 0.2 a 0.2 a Di-n-butyl phthalate T µg/l 20 Dichloroacetic acid 6 T µg/l 60 a 60 a 1,2-Dichlorobenzene T µg/l 420 600 a 1,3-Dichlorobenzene T µg/l 7.0 1,4-Dichlorobenzene T µg/l 63 75 a 3,3'-Dichlorobenzidine 5 T µg/l 0.21 Dichlorobromomethane 5 T µg/l 5.5 1,2-Dichloroethane 5 T µg/l 3.8 5.0 a 1,1-Dichloroethylene 5 T µg/l 0.57 7.0 a cis-1,2-Dichloroethylene T µg/l 70 a 70 a trans-1,2-Dichloroethylene T µg/l 100 a 100 a 2,4-Dichlorophenol T µg/l 10 1,2-Dichloropropane 5 T µg/l 5.0 a 5.0 a 1,3-Dichloropropene T µg/l 2.7 Dieldrin 5 T µg/l 1.2*10 -5 0.0000065 Di(2-ethylhexyl)adipate T µg/l 400 a 400 a Diethyl phthalate T µg/l 600 2,4-Dimethylphenol T µg/l 100 100 Dimethyl phthalate T µg/l 2,000 4,6-Dinitro-o-cresol (4,6-Dinitro-2-methylphenol) T µg/l 2.0 Dinitrophenols 4 T µg/l 10 2,4-Dinitrophenol T µg/l 10 10 2,4-Dinitrotoluene 5 T µg/l 0.49 Dinoseb T µg/l 7.0 a 7.0 a 1,2-Diphenylhydrazine 5 T µg/l 0.30 Diquat T µg/l 20 a 20 a Dissolved solids T mg/l 750/500 a,b 750/500 a,b alpha-Endosulfan 7 T µg/l 20 beta-Endosulfan 7 T µg/l 20 Endosulfan sulfate 7 T µg/l 20 Endothall T µg/l 100 a 100 a Endrin 8 T µg/l 0.03 2.0 a Endrin aldehyde 8 T µg/l 0.29 Ethylbenzene T µg/l 68 700 a Ethylene dibromide (EDB) T µg/l 0.050 a 0.050 a bis(2-Ethylhexyl)phthalate 5 T µg/l 3.2 6.0 a Fluoranthene T µg/l 20 Fluorene T µg/l 50 Fluoride T µg/l 1,000 4,000 a Glyphosate T µg/l 700 a 700 a Heptachlor 5 T µg/l 5.9*10 -5 0.4 a Heptachlor epoxide 5 T µg/l 0.00032 0.2 a Hexachlorobenzene 5 T µg/l 0.00079 0.00045 Hexachlorobutadiene 5 T µg/l 0.10 alpha-Hexachlorocyclohexane 5 T µg/l 0.0036 beta-Hexachlorocyclohexane 5 T µg/l 0.08 gamma-Hexachlorocyclohexane (Lindane) 5 T µg/l 0.20 0.20 a Hexachlorocyclohexane - technical grade 5 T µg/l 0.066 Hexachlorocyclopentadiene T µg/l 4.0 50 a Hexachloroethane 5 T µg/l 1.0 1.0 Indeno(1,2,3-c,d)pyrene 5 T µg/l 0.012 Iron S µg/l 300 a 300 a Isophorone 5 T µg/l 340 Mercury TR µg/l 0.012 0.0031 Methoxychlor T µg/l 0.02 40 a Methyl bromide T µg/l 47 3-Methyl-4-chlorophenol T µg/l 500 Methylene chloride 5 T µg/l 5.0 a 5.0 a Nickel TR µg/l 610 Nitrate-N + Nitrite-N T µg/l 10,000 a 10,000 a Nitrite-N T µg/l 1,000 a 1,000 a Nitrobenzene T µg/l 10 Nitrosoamines 5 T µg/l 0.0080 N-Nitrosodibutylamine 5 T µg/l 0.063 N-Nitrosodiethylamine 5 T µg/l 0.0080 N-Nitrosodimethylamine 5 T µg/l 0.0069 N-Nitrosodi-n-propylamine 5 T µg/l 0.050 N-Nitrosodiphenylamine 5 T µg/l 33 N-Nitrosodipyrrolidine 5 T µg/l 0.16 Oxamyl (Vydate) T µg/l 200 a 200 a Pentachlorobenzene T µg/l 0.1 Pentachlorophenol 5 T µg/l 0.3 1.0 a Phenol T µg/l 4,000 Picloram T µg/l 500 a 500 a Polychlorinated biphenyls 5 T µg/l 0.00064 0.000026 Pyrene T µg/l 20 Selenium TR µg/l 50 a 50 a Silvex (2,4,5-TP, 2-[2,4,5-Trichlorophenoxy]propionic acid T µg/l 10 50 a Simazine T µg/l 4.0 a 4.0 a Styrene T µg/l 100 a 100 a Sulfates T mg/l 250 a 250 a 1,2,4,5-Tetrachlorobenzene T µg/l 0.03 2,3,7,8-Tetrachlorodibenzo-p-dioxin 5 T µg/l 5.0*10 -8 5.0*10 -8 1,1,2,2-Tetrachloroethane 5 T µg/l 1.7 Tetrachloroethylene 5 T µg/l 5.0 a 5.0 a Thallium TR µg/l 1.7 Toluene T µg/l 57 57 Toxaphene 5 T µg/l 0.0028 0.000068 Trichloroacetic acid 6 T µg/l 60 a 60 a 1,2,4-Trichlorobenzene 5 T µg/l 0.71 70 a 1,1,1-Trichloroethane T µg/l 200 a 200 a 1,1,2-Trichloroethane 5 T µg/l 5.0 a 5.0 a Trichloroethylene 5 T µg/l 5.0 a 5.0 a 2,4,5-Trichlorophenol T µg/l 300 2,4,6-Trichlorophenol 5 T µg/l 14 Vinyl chloride 5 T µg/l 0.22 2.0 a Xylenes T µg/l 10,000 a 10,000 a Zinc T µg/l 7,400 1 S = soluble; T = total; TR = total recoverable. 2 mg/l = milligrams per liter (parts per million); µg/l = micrograms per liter (parts per billion); Mf/l = million fibers per liter. 3 OMZA = outside mixing zone average. 4 The criteria for this chemical apply to the sum of all dinitrophenols. 5 Criteria for this chemical are based on a carcinogenic endpoint. 6 The criterion for this chemical applies to the sum of chloroacetic acid, dichloroacetic acid and trichloroacetic acid. 7 The criteria for this chemical apply to the sum of alpha-endosulfan, beta-endosulfan and endosulfan sulfate. 8 The criteria for this chemical apply to the sum of endrin and endrin aldehyde. a This criterion is the maximum contaminant level (MCL) developed under the "Safe Drinking Water Act". b Equivalent 25ºC specific conductance values are 1200 micromhos/cm as a maximum and 800 micromhos/cm as a thirty day average. Table 33-2. Pollutants subject to any methodologies and procedures acceptable under 40 C.F.R. 131 for water bodies located in the lake Erie drainage basin. Alkalinity Ammonia Bacteria Biochemical oxygen demand (BOD) Chlorine Color Dissolved oxygen Dissolved solids pH Phosphorus Salinity Temperature Total and suspended solids Turbidity (B) Agricultural water supply criteria. (1) The chemical-specific criteria listed in table 33-3 of this rule apply as "Outside Mixing Zone Averages." For the purpose of setting water quality based effluent limits, the criteria shall be met after the effluent and the receiving water are reasonably well mixed as provided in rules 3745-1-06 and 3745-2-05 of the Administrative Code. (2) The water quality criteria for the protection of agricultural uses, or site-specific modifications thereof, adopted in, or developed pursuant to, this rule shall apply outside the mixing zone to all water bodies assigned the agricultural water supply use designation. (3) For any pollutant in table 33-3 of this rule for which it is demonstrated that a methodology or procedure cited in this chapter is not scientifically defensible, the director may apply an alternative methodology or procedure acceptable under 40 C.F.R. 131 when developing water quality criteria. Table 33-3. Statewide water quality criteria for the protection of agricultural uses. Chemical Form 1 Units 2 OMZA 3 Arsenic TR µg/l 100 Beryllium TR µg/l 100 Cadmium TR µg/l 50 Total chromium TR µg/l 100 Copper TR µg/l 500 Fluoride T µg/l 2,000 Iron TR µg/l 5,000 Lead TR µg/l 100 Mercury TR µg/l 10 Nickel TR µg/l 200 Nitrates+nitrites T mg/l 100 Selenium TR µg/l 50 Zinc TR µg/l 25,000 1 T = total; TR = total recoverable. 2 mg/l = milligrams per liter (parts per million); µg/l = micrograms per liter (parts per billion). 3 OMZA = outside mixing zone average. Last updated January 18, 2026 at 7:46 AM Supplemental Information Authorized By: 6111.041 Amplifies: 6111.041 1/13/2027 4/4/1985, 8/19/1985, 5/1/1990, 10/31/1997, 7/31/1998, 7/31/1999, 2/6/2017