Ohio Admin. Code 3745-1-37
[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.]
The chemical-specific criteria listed in this rule apply as "Outside Mixing Zone" or "Inside Mixing Zone Maximum." For the purpose of setting water quality based effluent limits, the criteria which apply "Outside Mixing Zone" 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. The criteria listed as "Inside Mixing Zone Maximum" shall be applicable as end-of-pipe maximum effluent limits or as criteria to be met within a short distance of the effluent pipe except as provided in rule 3745-2-08 of the Administrative Code.
Table 37-1. Statewide water quality criteria for the protection against adverse aesthetic conditions.
Chemical | Form 1 | Units2 | IMZM3 | OMZM3 | Drinking |
2-Chlorophenol | T | µg/l | -- | -- | 0.1a |
2,4-Dichlorophenol | T | µg/l | -- | -- | 0.3a |
MBAS (foaming agents) | T | mg/l | -- | 0.50 | -- |
Oil & grease | T | mg/l | -- | 10b | -- |
Phenol | T | µg/l | -- | -- | 1.0a |
Phosphorus | T | mg/l | C | -- | C |
1 T= total.
2 mg/l = milligrams per liter (parts per million); µg/l = micrograms per liter (parts per billion).
3 IMZM = inside mixing zone maximum; OMZM = outside mixing zone maximum.
a This criterion is based on the protection against organoleptic (taste or odor) effects.
b Surface waters shall be free from floating oils and shall at no time produce a visible sheen or color film. Levels of oils or petrochemicals in the sediment or on the banks of a watercourse which cause deleterious effects on the biota will not be permitted.
c Total phosphorus as P shall be limited to the extent necessary to prevent nuisance growths of algae, weeds, and slimes that result in a violation of the water quality criteria set forth in paragraph (E) of rule 3745-1-04 of the Administrative Code or, for public water supplies, that result in taste or odor problems. In areas where such nuisance growths exist, phosphorus discharges from point sources determined significant by the director shall not exceed a daily average of one milligram per liter as total P, or such stricter requirements as may be imposed by the director in accordance with the international joint commission (United States-Canada agreement).
Table 37-2. Statewide numerical criteria for the protection of recreation uses. These criteria apply inside and outside the mixing zone at all times during the recreation season.
Recreation use | E. coli (colony counts per 100 ml) | |
90-day geometric mean | Statistical threshold value1 | |
Bathing water | 126 | 410a |
Primary contact recreation | 126 | 410 |
Secondary contact recreation | 1030 | 1030 |
1 These criteria shall not be exceeded in more than ten per cent of the samples taken during any ninety-day period.
a A beach action value of 235 E. coli colony counts per 100 ml shall be used for the purpose of issuing beach and bathing water advisories.
Replaces: Part of: 3745-1-07
Ohio Admin. Code 3745-1-37
Five Year Review (FYR) Dates: 02/06/2022
Promulgated Under: 119.03
Statutory Authority: 6111.041
Rule Amplifies: 6111.041
Prior Effective Dates: 2/14/1978, 4/4/1985, 8/19/1985, 4/30/1987, 5/1/1990, 4/26/1997, 10/31/1997, 7/31/1998, 7/31/1999, 2/22/2002, 12/30/2002, 3/15/2010, 1/4/2016