Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 302 - WATER QUALITY STANDARDS
Appendix C - Maximum total ammonia nitrogen concentrations allowable for certain combinations of pH and temperature
Table B - Temperature and pH-Dependent Values of the CS (Chronic Standard) for Fish Early Life Stages Absent

Universal Citation: 35 IL Admin Code ยง B
Current through Register Vol. 48, No. 38, September 20, 2024

pH

Temperature, °Celsius

0-7

8

9

10

11

12

13

14

15

16

6

11.3

10.6

9.92

9.30

8.72

8.17

7.66

7.19

6.74

6.32

6.1

11.2

10.5

9.87

9.25

8.67

8.13

7.62

7.15

6.70

6.28

6.2

11.2

10.5

9.81

9.19

8.62

8.08

7.58

7.10

6.66

6.24

6.3

11.1

10.4

9.73

9.12

8.55

8.02

7.52

7.05

6.61

6.19

6.4

11.0

10.3

9.63

9.03

8.47

7.94

7.44

6.98

6.54

6.13

6.5

10.8

10.1

9.51

8.92

8.36

9.84

7.35

6.89

6.46

6.06

6.6

10.7

9.99

9.37

8.79

8.24

7.72

7.24

6.79

6.36

5.97

6.7

10.5

9.81

9.20

8.62

8.08

7.58

7.11

6.66

6.25

5.86

6.8

10.2

9.58

8.98

8.42

7.90

7.40

6.94

6.51

6.10

5.72

6.9

9.93

9.31

8.73

8.19

7.68

7.20

6.75

6.33

5.93

5.56

7

9.60

9.00

8.43

7.91

7.41

6.95

6.52

6.11

5.73

5.37

7.1

9.20

8.63

8.09

7.58

7.11

6.67

6.25

5.86

5.49

5.15

7.2

8.75

8.20

7.69

7.21

6.76

6.34

5.94

5.57

5.22

4.90

7.3

8.24

7.73

7.25

6.79

6.37

5.97

5.60

5.25

4.92

4.61

7.4

7.69

7.21

6.76

6.33

5.94

5.57

5.22

4.89

4.59

4.30

7.5

7.09

6.64

6.23

5.84

5.48

5.13

4.81

4.51

4.23

3.97

7.6

6.46

6.05

5.67

5.32

4.99

4.68

4.38

4.11

3.85

3.61

7.7

5.81

5.45

5.11

4.79

4.49

4.21

3.95

3.70

3.47

3.25

7.8

5.17

4.84

4.54

4.26

3.99

3.74

3.51

3.29

3.09

2.89

7.9

4.54

4.26

3.99

3.74

3.51

3.29

3.09

2.89

2.71

2.54

8

3.95

3.70

3.47

3.26

3.05

2.86

2.68

2.52

2.36

2.21

8.1

3.41

3.19

2.99

2.81

2.63

2.47

2.31

2.17

2.03

1.91

8.2

2.91

2.73

2.56

2.40

2.25

2.11

1.98

1.85

1.74

1.63

8.3

2.47

2.32

2.18

2.04

1.91

1.79

1.68

1.58

1.48

1.39

8.4

2.09

1.96

1.84

1.73

1.62

1.52

1.42

1.33

1.25

1.17

8.5

1.77

1.66

1.55

1.46

1.37

1.28

1.20

1.13

1.06

0.99

8.6

1.49

1.40

1.31

1.23

1.15

1.08

1.01

0.95

0.89

0.84

8.7

1.26

1.18

1.11

1.04

0.98

0.92

0.86

0.80

0.75

0.71

8.8

1.07

1.01

0.94

0.88

0.83

0.78

0.73

0.68

0.64

0.60

8.9

0.92

0.86

0.81

0.76

0.71

0.66

0.62

0.58

0.55

0.51

9.0

0.79

0.74

0.69

0.65

0.61

0.57

0.54

0.50

0.47

0.44

* At 15° C and above, the criterion for fish ELS Absent is the same as the criterion for fish ELS Present.

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