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Chemical Water Quality Standards (Ohio Administrative code
3745-1-07)
| Chemical |
Form |
Units1 |
Inside Mixing Zone Maximum |
Outside Mixing Zone Maximum |
Outside Mixing Zone Average |
| Ammonia-N (WWH) |
Total |
mg/l |
- - |
Table 7-2 |
Table 7-5 |
| Ammonia-N (EWH) |
Total |
mg/l |
- - |
Table 7-3 |
Table 7-6 |
| Ammonia-N (MWH) |
Total |
mg/l |
- - |
Table 7-2 |
Table 7-7 |
| Ammonia-N (SSH2) |
Total |
mg/l |
- - |
Table 7-4 |
a |
| Ammonia-N (CWH) |
Total |
mg/l |
- - |
Table 7-4 |
Table 7-8 |
| Ammonia-N (LRW) |
Total |
mg/l |
- - |
Table 7-2 |
- - |
| Arsenic |
Dissolved4 |
μg/l |
680 |
340 |
150 |
| Arsenic |
Total Recoverable5 |
μg/l |
680 |
340 |
150 |
| Cadmium7 |
|
|
|
|
|
| Chlorine(WWH, EWH, MWH, CWH) |
Total Residual |
μg/l |
- - |
19 |
11 |
| Chlorine(LRW) |
Total Residual |
μg/l |
- - |
19 |
- - |
| Chlorine(SSH2) |
Total Residual |
μg/l |
- - |
b |
b |
| Chromium6 |
|
|
|
|
|
| Chromium VI |
Dissolved |
μg/l |
31 |
16 |
11 |
| Copper6 |
|
|
|
|
|
| Cyanide(WWH, EWH, MWH) |
Free |
μg/l |
92 |
46 |
12 |
| Cyanide(LRW) |
Free |
μg/l |
92 |
46 |
- - |
| Cyanide(SSH2, CWH) |
Free |
μg/l |
45 |
22 |
5.2 |
| Dieldrin |
Total |
μg/l |
0.47 |
0.24 |
0.056 |
| Dissolved oxygen3 (WWH) |
Total |
mg/l |
- - |
4.0 |
5.0 |
| Dissolved oxygen3 (EWH) |
Total |
mg/l |
- - |
5.0 |
6.0 |
| Dissolved oxygen3
(MWH) |
Total |
mg/l |
- - |
3.0c |
4.0 |
| Dissolved oxygen3
(SSH2) |
Total |
mg/l |
- - |
a |
a |
| Dissolved oxygen3 (CWH) |
Total |
mg/l |
- - |
6.0 |
7.0 |
| Dissolved oxygen3 (LRW) |
Total |
mg/l |
- - |
2.0 |
3.0 |
| Dissolved solids |
Total |
mg/l |
- - |
- - |
1500d |
| Endrin |
Total |
μg/l |
0.17 |
0.086 |
0.036 |
| Lead6 |
|
|
|
|
|
| Lindane |
Total |
μg/l |
1.9 |
0.95 |
- - |
| Mercury |
Dissolved4 |
μg/l |
2.9 |
1.4 |
0.77 |
| Mercury |
Total Recoverable5 |
μg/l |
3.4 |
1.7 |
0.91 |
| Nickel6 |
|
|
|
|
|
| Parathion |
Total |
μg/l |
0.13 |
0.065 |
0.013 |
| Pentachlorophenol7 |
|
|
|
|
|
| pH (WWH, MWH) |
- - |
s.u. |
- - |
- - |
6.5-9.0 |
| pH (EWH, CWH) |
- - |
s.u. |
- - |
- - |
e |
| pH(SSH2) |
- -
|
s.u. |
- -
|
- -
|
a |
| pH(LRW) |
- - |
s.u. |
- - |
- - |
6.5-9.0f |
| Selenium |
Dissolved4 |
μg/l |
- - |
- - |
4.6 |
| Selenium |
Total Recoverable5 |
μg/l |
- - |
- - |
5.0 |
| Temperature (WWH, MWH) |
- - |
0F(0C) |
- - |
Table 7-14 |
Table 7-14 |
| Temperature (EWH, CWH) |
- - |
0F(0C) |
- - |
g |
g |
| Temperature (SSH2) |
- - |
0F(0C) |
- - |
a |
a |
| Temperature (LRW) |
- - |
0F(0C) |
- - |
98(37) |
94(34) |
| Zinc6 |
|
|
|
|
|
1. mg/l = milligrams per liter (parts per million); μg/l =
micrograms per liter (parts per billion); s.u. = standard units; 0F
=degrees Fahrenheit; 0C =
degrees Celsius.
2. SSH- This aquatic life habitat use designation is in effect
only during the months of October to May
3. Outside Mixing Zone Maximum means outside mixing zone minimum
Outside Mixing Zone Average means outside mixing zone minimum twenty-four-hour
average
4. These criteria are implemented by multiplying them by a
translator approved by the director pursuant to rule
3745-2-04 of the
Administrative Code.
5. These criteria apply in the absence of a translator approved
by the director pursuant to rule 3745-2-04 of the Administrative Code.
6. These criteria are water hardness dependent. See table
7-9 of OAC 3745-2-04.
7. These criteria are water pH dependent. See table 7-10
of this rule.
a. This criterion is the same as that for the aquatic life
use designation in effect June to September. See footnote 2.
b. No chlorine is to be discharged.
c. The dissolved oxygen minimum at any time criterion for
modified warmwater habitats in the Huron/Erie lake plain ecoregion, as identified in rules
3745-1-08 to
3745-1-30 of
the Administrative Code, is 2.5 mg/l.
d. Equivalent 25°C specific conductance value is 2400 micromhos/cm.
e. pH is to be 6.5-9.0, with no change within that range
attributable to human-induced conditions.
f. Acid mine drainage streams over sandstone geotype are exempt
from the pH criterion.
g. At no time shall the water temperature exceed the
temperature which would occur if there were no temperature change attributable to human activities.
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