Ill. Admin. Code tit. 35, § 302.304
The following levels of chemical constituents must not be exceeded:
| CONCENTRATION | |
| CONSTITUENT | (mg/L) |
| Arsenic (total) | 0.05 |
| Barium (total) | 1.0 |
| Boron (total) | 1.0 |
| Cadmium (total) | 0.010 |
| Chloride (total) | 250 |
| Chromium | 0.05 |
| Fluoride (total) | 1.4 |
| Iron (dissolved) | 0.3 |
| Lead (total) | 0.05 |
| Manganese (total) | 1.0 |
| Nitrate-Nitrogen | 10 |
| Oil (hexane-solubles or equivalent) | 0.1 |
| Organics | |
| Pesticides | |
| Chlorinated Hydro- | |
| carbon Insecticides | |
| Aldrin | 0.001 |
| Chlordane | 0.003 |
| DDT | 0.05 |
| Dieldrin | 0.001 |
| Endrin | 0.0002 |
| Heptachlor | 0.0001 |
| Heptachlor Expoxide | 0.0001 |
| Lindane | 0.004 |
| Methoxychlor | 0.1 |
| Toxaphene | 0.0005 |
| Organophosphate | |
| Insecticides | |
| Parathion | 0.1 |
| Chlorophenoxy Herbicides | |
| 2,4-Dichlorophenoxy- | |
| acetic acid (2,4-D) | 0.1 |
| 2-(2,4,5-Trichloro- | |
| phenoxy)-propionic | |
| acid (2,4,5-TP | |
| or Silvex) | 0.01 |
| Phenols | 0.001 |
| Selenium (total) | 0.01 |
| Sulfate | 250 |
| Total Dissolved Solids | 500 |
(Source: Amended at 47 Ill. Reg. 4437, effective March 23, 2023)