TITLE 35: ENVIRONMENTAL PROTECTION
SUBTITLE C: WATER POLLUTION
CHAPTER I: POLLUTION CONTROL BOARD
PART 302 WATER QUALITY STANDARDS
SECTION 302.504 CHEMICAL CONSTITUENTS


 

Section 302.504  Chemical Constituents

 

The following concentrations of chemical constituents must not be exceeded, except as provided in Sections 302.102 and 302.530:

 

a)         The following standards must be met in all waters of the Lake Michigan Basin.  Acute aquatic life standards (AS) must not be exceeded at any time except for those waters for which the Agency has approved a zone of initial dilution (ZID) under Sections 302.102 and 302.530.  Chronic aquatic life standards (CS) and human health standards (HHS) must not be exceeded outside of waters in which mixing is allowed under Sections 302.102 and 302.530 by the arithmetic average of at least four consecutive samples collected over at least four days.  The samples used to demonstrate compliance with the CS or HHS must be collected in a manner that assures an average representation of the sampling period.

 

Constituent

Unit

AS

CS

HHS

Arsenic (Trivalent, dissolved)

µg/L

148 x 1.0*=148

 

NA

 

 

 

 

 

Boron (total)

mg/L

40.1

7.6

NA

 

 

 

 

 

Cadmium (dissolved)

µg/L

NA

(0.041838)]}*

(0.041838)]}*

 

 

 

 

 

 

 

where A = -3.6867 and B = 1.128

where A = -2.715 and B = 0.7852

 

 

 

 

 

 

Chromium (Hexavalent, total)

µg/L

16

11

NA

 

 

 

 

 

Chromium (Trivalent, dissolved)

µg/L

NA

0.316*

0.860*

 

 

where A = 3.7256 and B = 0.819

where A = 0.6848 and B = 0.819

 

 

 

 

 

 

Copper (dissolved)

µg/L

NA

0.960*

0.960*

 

 

 

 

 

 

 

where A = -1.700 and B = 0.9422

where A = -1.702 and B = 0.8545

 

 

 

 

 

 

Cyanide**

µg/L

22

5.2

NA

 

 

 

 

 

Fluoride (total)

µg/L

 

where A = 6.7319 and B = 0.5394

, but must not exceed 4.0 mg/L

NA

 

 

 

 

 

where A = 6.0445 and B = 0.5394

 

 

 

 

 

 

Lead (dissolved)

µg/L

NA

(0.145712)]}*

(0.145712)]}*

 

 

 

 

 

 

 

where A = -1.055 and B =1.273

where A = -4.003 and B = 1.273

 

 

 

 

 

 

Manganese (dissolved)

µg/L

NA

 

 

 

 

 

 

 

where A = 4.9187 and B = 0.7467

where A = 4.0635 and B = 0.7467

 

 

 

 

 

 

Nickel (dissolved)

µg/L

NA

0.998*

0.997*

 

 

 

 

 

 

 

where A = 2.255 and B = 0.846

where A = 0.0584 and B = 0.846

 

 

 

 

 

 

Selenium (dissolved)

µg/L

NA

5.0

NA

 

 

 

 

 

TRC

µg/L

19

11

NA

 

 

 

 

 

Zinc (dissolved)

µg/L

NA

0.978*

0.986*

 

 

 

 

 

 

 

where A = 0.884 and B = 0.8473

where A = 0.884 and B = 0.8473

 

 

 

 

 

 

Benzene

µg/L

3900

800

310

 

 

 

 

 

Chlorobenzene

mg/L

NA

NA

3.2

 

 

 

 

 

2.4-Dimethylphenol

mg/L

NA

NA

8.7

 

 

 

 

 

2,4-Dinitrophenol

mg/L

NA

NA

2.8

 

 

 

 

 

Endrin

µg/L

0.086

0.036

NA

 

 

 

 

 

Ethylbenzene

µg/L

150

14

NA

 

 

 

 

 

Hexachloroethane

µg/L

NA

NA

6.7

 

 

 

 

 

Methylene chloride

mg/L

NA

NA

2.6

 

 

 

 

 

Parathion

µg/L

0.065

0.013

NA

 

 

 

 

 

Pentachlorophenol

µg/L

 

NA

 

 

 

 

 

 

 

where A = -4.869 and B = 1.005

where A = -5.134 and B = 1.005

 

 

 

 

 

 

Toluene

µg/L

2000

610

51.0

 

 

 

 

 

Trichloroethylene

µg/L

NA

NA

370

 

 

 

 

 

Xylene(s)

µg/L

1200

490

NA

 

where:

 

NA

=

Not Applied

 

exp[x]

=

base of natural logarithms raised to the x-power

 

ln(H)

=

natural logarithm of hardness in mg/L as CaCO3

 

*

 

=

conversion factor multiplier for dissolved metals

 

**

=

standard to be evaluated using either of the following USEPA approved methods, incorporated by reference at 35 Ill. Adm. Code 301.106:  Method OIA-1677, DW:  Available Cyanide by Flow Injection, Ligand Exchange, and Amperometry, January 2004, Document Number EPA-821-R-04-001; or Cyanide Amenable to Chlorination, Standard Methods 4500-CN-G (40 CFR 136.3).

 

b)         The following water quality standards must not be exceeded at any time in any waters of the Lake Michigan Basin unless a different standard is specified under subsection (c).

 

Constituent

 

Unit

Water Quality Standard

Barium (total)

01007

mg/L

5.0

Chloride (total)

 

mg/L

500

Iron (dissolved)

 

mg/L

1.0

Phenols

 

mg/L

0.1

Sulfate

 

mg/L

500

Total Dissolved Solids

 

mg/L

1000

 

c)         In addition to the standards specified in subsections (a) and (b), the following standards must not be exceeded at any time in the Open Waters of Lake Michigan as defined in Section 302.501.

 

Constituent

Unit

Water Quality Standard

Arsenic (total)

µg/L

50.0

Boron (total)

mg/L

1.0

Barium (total)

mg/L

1.0

Chloride (total)

mg/L

12.0

Fluoride (total)

mg/L

1.4

Iron (dissolved)

mg/L

0.30

Lead (total)

µg/L

50.0

Manganese (total)

mg/L

0.15

Nitrate-Nitrogen

mg/L

10.0

Phosphorus

µg/L

7.0

Selenium (total)

µg/L

10.0

Sulfate

mg/L

24.0

Total Dissolved Solids

mg/L

180.0

Oil (hexane solubles or equivalent)

mg/L

0.10

Phenols

µg/L

1.0

 

d)         In addition to the standards specified in subsections (a), (b), and (c), the following human health standards (HHS) must not be exceeded in the Open Waters of Lake Michigan as defined in Section 302.501 by the arithmetic average of at least four consecutive samples collected over at least four days.  The samples used to demonstrate compliance with the HHS must be collected in a manner that assures an average representation of the sampling period.

 

Constituent

Unit

Water Quality Standard

Benzene

µg/L

12.0

Chlorobenzene

µg/L

470.0

2,4-Dimethylphenol

µg/L

450.0

2,4-Dinitrophenol

µg/L

55.0

Hexachloroethane (total)

µg/L

5.30

Lindane

µg/L

0.47

Methylene chloride

µg/L

47.0

Trichloroethylene

µg/L

29.0

 

e)         For the following bioaccumulative chemicals of concern (BCCs), acute aquatic life standards (AS) must not be exceeded at any time in any waters of the Lake Michigan Basin and chronic aquatic life standards (CS), human health standards (HHS), and wildlife standards (WS) must not be exceeded in any waters of the Lake Michigan Basin by the arithmetic average of at least four consecutive samples collected over at least four days subject to the limitations of Sections 302.520 and 302.530.  The samples used to demonstrate compliance with the HHS and WS must be collected in a manner that assures an average representation of the sampling period.

 

Constituent

Unit

AS

CS

HHS

WS

Mercury (total)

ng/L

1,700

910

3.1

1.3

Chlordane

ng/L

NA

NA

0.25

NA

DDT and metabolites

pg/L

NA

NA

150

11.0

Dieldrin

ng/L

240

56

0.0065

NA

Hexachlorobenzene

ng/L

NA

NA

0.45

NA

Lindane

µg/L

0.95

NA

0.5

NA

PCBs (class)

pg/L

NA

NA

26

120

2,3,7,8-TCDD

fg/L

NA

NA

8.6

3.1

Toxaphene

pg/L

NA

NA

68

NA

 

where:

 

mg/L

=

milligrams per liter (10-3 grams per liter)

 

µg/L

=

micrograms per liter (10-6 grams per liter)

 

ng/L

=

nanograms per liter (10-9 grams per liter)

 

pg/L

=

picograms per liter (10-12 grams per liter)

 

fg/L

=

femtograms per liter (10-15 grams per liter)

 

NA

=

Not Applied

 

(Source:  Amended at 47 Ill. Reg. 4437, effective March 23, 2023)