Out of 691 ZIP codes with data in Illinois, these are the highest-ranked areas for lead (ppb). See also: National Worst ZIP Codes for Lead in Water | All Illinois Rankings
| Statistic | Value |
|---|---|
| ZIP codes ranked | 691 |
| Highest value | 76.0 ppb |
| Median value | 6.2 ppb |
| State | Illinois |
Top 100 Worst ZIP Codes
| Rank | ZIP Code | City | State | Lead (ppb) | Safety Score |
|---|---|---|---|---|---|
| 1 | 60035 | Highland Park | IL | 76.0 ppb | 76/100 |
| 2 | 60040 | Highwood | IL | 76.0 ppb | 81/100 |
| 3 | 61752 | Le Roy | IL | 49.0 ppb | 58/100 |
| 4 | 60439 | Lemont | IL | 20.0 ppb | 79/100 |
| 5 | 60440 | Bolingbrook | IL | 20.0 ppb | 80/100 |
| 6 | 60446 | Romeoville | IL | 20.0 ppb | 82/100 |
| 7 | 60464 | Palos Park | IL | 20.0 ppb | 68/100 |
| 8 | 60491 | Homer Glen | IL | 20.0 ppb | 80/100 |
| 9 | 61341 | Marseilles | IL | 19.1 ppb | — |
| 10 | 61360 | Seneca | IL | 19.1 ppb | — |
| 11 | 60010 | Barrington | IL | 15.0 ppb | 67/100 |
| 12 | 60013 | Cary | IL | 15.0 ppb | 75/100 |
| 13 | 60633 | Chicago | IL | 14.2 ppb | 58/100 |
| 14 | 60422 | Flossmoor | IL | 14.0 ppb | 65/100 |
| 15 | 60429 | Hazel Crest | IL | 14.0 ppb | 60/100 |
| 16 | 60430 | Homewood | IL | 14.0 ppb | 43/100 |
| 17 | 60476 | Thornton | IL | 14.0 ppb | 68/100 |
| 18 | 60478 | Country Club Hills | IL | 14.0 ppb | 58/100 |
| 19 | 62246 | Greenville | IL | 14.0 ppb | — |
| 20 | 62262 | Mulberry Grove | IL | 14.0 ppb | — |
| 21 | 62284 | Smithboro | IL | 14.0 ppb | — |
| 22 | 60112 | Cortland | IL | 13.0 ppb | — |
| 23 | 60115 | Dekalb | IL | 13.0 ppb | — |
| 24 | 60174 | Saint Charles | IL | 13.0 ppb | 59/100 |
| 25 | 60175 | Saint Charles | IL | 13.0 ppb | 54/100 |
| 26 | 60177 | South Elgin | IL | 13.0 ppb | 40/100 |
| 27 | 60178 | Sycamore | IL | 13.0 ppb | — |
| 28 | 61801 | Urbana | IL | 13.0 ppb | 63/100 |
| 29 | 61802 | Urbana | IL | 13.0 ppb | 61/100 |
| 30 | 61820 | Champaign | IL | 13.0 ppb | 64/100 |
| 31 | 61822 | Champaign | IL | 13.0 ppb | 62/100 |
| 32 | 61874 | Savoy | IL | 13.0 ppb | 62/100 |
| 33 | 62215 | Albers | IL | 12.6 ppb | — |
| 34 | 62216 | Aviston | IL | 12.6 ppb | — |
| 35 | 62218 | Bartelso | IL | 12.6 ppb | — |
| 36 | 62245 | Germantown | IL | 12.6 ppb | — |
| 37 | 62265 | New Baden | IL | 12.6 ppb | — |
| 38 | 62266 | New Memphis | IL | 12.6 ppb | — |
| 39 | 62293 | Trenton | IL | 12.6 ppb | — |
| 40 | 60409 | Calumet City | IL | 12.4 ppb | 58/100 |
| 41 | 60419 | Dolton | IL | 12.4 ppb | — |
| 42 | 60473 | South Holland | IL | 12.4 ppb | 58/100 |
| 43 | 62254 | Lebanon | IL | 12.2 ppb | 83/100 |
| 44 | 62258 | Mascoutah | IL | 12.2 ppb | 60/100 |
| 45 | 62269 | O Fallon | IL | 12.2 ppb | 83/100 |
| 46 | 60030 | Grayslake | IL | 12.0 ppb | 67/100 |
| 47 | 60046 | Lake Villa | IL | 12.0 ppb | 76/100 |
| 48 | 60060 | Mundelein | IL | 12.0 ppb | 67/100 |
| 49 | 60073 | Round Lake | IL | 12.0 ppb | 67/100 |
| 50 | 60521 | Hinsdale | IL | 12.0 ppb | 69/100 |
| 51 | 60525 | La Grange | IL | 12.0 ppb | 60/100 |
| 52 | 60527 | Willowbrook | IL | 12.0 ppb | 60/100 |
| 53 | 60558 | Western Springs | IL | 12.0 ppb | 62/100 |
| 54 | 61264 | Milan | IL | 12.0 ppb | 52/100 |
| 55 | 62420 | Casey | IL | 11.4 ppb | 69/100 |
| 56 | 62442 | Martinsville | IL | 11.4 ppb | — |
| 57 | 62896 | West Frankfort | IL | 11.3 ppb | — |
| 58 | 60101 | Addison | IL | 11.2 ppb | 75/100 |
| 59 | 60137 | Glen Ellyn | IL | 11.2 ppb | 58/100 |
| 60 | 60139 | Glendale Heights | IL | 11.2 ppb | 73/100 |
| 61 | 60148 | Lombard | IL | 11.2 ppb | 61/100 |
| 62 | 60181 | Villa Park | IL | 11.2 ppb | 79/100 |
| 63 | 60515 | Downers Grove | IL | 11.2 ppb | 74/100 |
| 64 | 60005 | Arlington Heights | IL | 11.1 ppb | 58/100 |
| 65 | 60007 | Elk Grove Village | IL | 11.1 ppb | 58/100 |
| 66 | 60016 | Des Plaines | IL | 11.1 ppb | 58/100 |
| 67 | 60018 | Des Plaines | IL | 11.1 ppb | 59/100 |
| 68 | 60056 | Mount Prospect | IL | 11.1 ppb | 58/100 |
| 69 | 60068 | Park Ridge | IL | 11.1 ppb | 61/100 |
| 70 | 60015 | Deerfield | IL | 11.0 ppb | 76/100 |
| 71 | 60026 | Glenview | IL | 11.0 ppb | 73/100 |
| 72 | 60062 | Northbrook | IL | 11.0 ppb | 66/100 |
| 73 | 60090 | Wheeling | IL | 11.0 ppb | 62/100 |
| 74 | 60093 | Winnetka | IL | 11.0 ppb | 70/100 |
| 75 | 62231 | Carlyle | IL | 11.0 ppb | — |
| 76 | 60131 | Franklin Park | IL | 10.7 ppb | 71/100 |
| 77 | 60160 | Melrose Park | IL | 10.7 ppb | 67/100 |
| 78 | 60164 | Melrose Park | IL | 10.7 ppb | 71/100 |
| 79 | 61301 | La Salle | IL | 10.5 ppb | — |
| 80 | 61316 | Cedar Point | IL | 10.5 ppb | — |
| 81 | 61348 | Oglesby | IL | 10.5 ppb | — |
| 82 | 61354 | Peru | IL | 10.5 ppb | — |
| 83 | 61239 | Carbon Cliff | IL | 10.0 ppb | — |
| 84 | 61244 | East Moline | IL | 10.0 ppb | 50/100 |
| 85 | 61256 | Hampton | IL | 10.0 ppb | — |
| 86 | 61265 | Moline | IL | 10.0 ppb | 50/100 |
| 87 | 61282 | Silvis | IL | 10.0 ppb | 50/100 |
| 88 | 62016 | Carrollton | IL | 10.0 ppb | — |
| 89 | 62044 | Greenfield | IL | 10.0 ppb | — |
| 90 | 62098 | Wrights | IL | 10.0 ppb | — |
| 91 | 62801 | Centralia | IL | 10.0 ppb | — |
| 92 | 62841 | Freeman Spur | IL | 10.0 ppb | — |
| 93 | 62882 | Sandoval | IL | 10.0 ppb | — |
| 94 | 62918 | Carterville | IL | 10.0 ppb | — |
| 95 | 62933 | Energy | IL | 10.0 ppb | — |
| 96 | 62948 | Herrin | IL | 10.0 ppb | — |
| 97 | 62951 | Johnston City | IL | 10.0 ppb | — |
| 98 | 62959 | Marion | IL | 10.0 ppb | — |
| 99 | 60406 | Blue Island | IL | 10.0 ppb | 42/100 |
| 100 | 60418 | Crestwood | IL | 10.0 ppb | 58/100 |
Methodology
Lead rankings are based on the 90th percentile lead testing value (PB90) reported by water systems under the Lead and Copper Rule. When CCR data is unavailable, EPA SDWIS lead sampling data is used. The EPA action level for lead is 15 ppb (0.015 mg/L). There is no safe level of lead exposure.
Data sources: EPA Safe Drinking Water Information System (SDWIS), FEMA National Flood Insurance Program, EPA radon zone maps, EIA electricity rates, and Consumer Confidence Reports. Last updated: 2026-08-11.
Frequently Asked Questions
What is a dangerous lead level in water?
The EPA action level is 15 parts per billion (ppb). The American Academy of Pediatrics recommends no more than 1 ppb for school drinking water. There is no safe level of lead exposure for children.
How is lead measured in water?
Water systems collect samples from homes with known lead service lines or lead solder. The 90th percentile value (PB90) means 90% of samples tested below that level. If PB90 exceeds 15 ppb, the system must take corrective action.
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