Chloride in Illinois well water
In Illinois, chloride was detected in 97% of 6,737 tested private well samples.
Chloride mainly comes from road salt and water softener discharge. Above 250 mg/L water tastes salty and corrodes plumbing. Rising chloride in a well usually means road salt is reaching the aquifer.
Check your chloride number
Type the value from your lab report. It is compared to the EPA limit, the same way the full interpretation does it.
Test your Illinois well for chloride
Certified lab analysis of your own tap water, bottles and prepaid return shipping included. The Essential well panel covers arsenic, uranium, nitrate, lead, copper, manganese, iron, sodium and bacteria; radon and PFAS are add-ons.
Order the Tap Score well water test kit, from $209Already tested? Upload the report
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Systems that remove chloride
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Some links below are affiliate links. If you buy through one, the merchant pays us a commission at no extra cost to you. It does not change which products we list or what the data says.
For chloride
Under-sink reverse osmosis system
under-sink or countertop, about $300
Look for NSF/ANSI 58 certification listing the contaminant you need removed.
Rather have it installed and sized for your well? Book a free in-home water test with a licensed local company.
Where to get a well tested for chloride in Illinois: certified labs, state programs and prices.
By county, from individual samples
Public monitoring samples against the EPA limit; counties with at least 30 samples.
| County | Above EPA limit | Samples | Detected | Median | Highest |
|---|---|---|---|---|---|
| Massac | no limit | 32 | 100% | 4.8 | 105 mg/L |
| St. Clair | no limit | 93 | 100% | 27 | 220 mg/L |
| Madison | no limit | 177 | 100% | 28 | 4,890 mg/L |
| Macon | no limit | 50 | 100% | 21.1 | 79 mg/L |
| Pulaski | no limit | 39 | 100% | 10 | 65 mg/L |
| Randolph | no limit | 59 | 100% | 21 | 5,390 mg/L |
| Grundy | no limit | 61 | 100% | 48 | 310 mg/L |
| Logan | no limit | 39 | 100% | 17 | 452 mg/L |
| De Witt | no limit | 93 | 100% | 54.8 | 122 mg/L |
| Livingston | no limit | 45 | 100% | 17 | 546 mg/L |
| DuPage | no limit | 514 | 100% | 24 | 637 mg/L |
| Kankakee | no limit | 87 | 100% | 14 | 165 mg/L |
| Piatt | no limit | 56 | 100% | 9.45 | 58 mg/L |
| Marshall | no limit | 34 | 100% | 18.5 | 1,720 mg/L |
| Vermilion | no limit | 54 | 100% | 4.36 | 99 mg/L |
- Schaumburg township, Cook County100% detected of 69
- Proviso township, Cook County100% detected of 66
- Lyons township, Cook County100% detected of 52
- Maine township, Cook County100% detected of 34
- Lockport township, Will County100% detected of 72
- Warren township, Lake County100% detected of 38
- Joliet township, Will County100% detected of 84
- Zion township, Lake County100% detected of 33
- Libertyville township, Lake County100% detected of 35
- Bloomingdale township, DuPage County100% detected of 35
- Addison township, DuPage County100% detected of 68
- Downers Grove township, DuPage County100% detected of 77
- Winfield township, DuPage County100% detected of 33
- Lisle township, DuPage County100% detected of 39
- Milton township, DuPage County100% detected of 41
- York township, DuPage County100% detected of 156
- Chicago, Cook County100% detected of 113
- Wheeling township, Cook County100% detected of 144
- Hanover township, Cook County100% detected of 45
- Palatine township, Cook County100% detected of 60
Sources
- Individual samples from the USGS Water Quality Portal and state monitoring, summarized per geography. chloride counts and shares are listed on each county and town page with their sources.