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Distribution of water lead levels (µg/L) for January 1, 2020–June 20, 2021 in data reported to state environmental agencies under the Lead and Copper Rule.
| WLL category | Pennsylvania N (%) | Illinois N (%) |
|---|---|---|
| Non-detect | 1674 (50.4) | 1188 (59.3) |
| Detectable, <15 µg/L | 1427 (42.9) | 743 (37.1) |
| ≥15 µg/L | 223 (6.7) | 74 (3.7) |
| Total | 3,324 (100) | 2,005(100) |
