Il American-South Beloit, IL
Lead detected, under the action levels
Latest 90th-percentile lead: 4 ppb (monitoring period 2025-2025). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. Lead was measured in sampled homes but the 90th percentile is under both action levels. EPA's health goal for lead is zero, so test your own tap if your home was built before 1986 or anyone in it is pregnant or a young child.
Who runs the water here
Il American-South Beloit serves about 7,893 people through 2,989 service connections, which makes it a medium-sized system under EPA's size classes. It is privately owned and draws groundwater, in Winnebago County, Illinois. EPA system ID: IL2010450; phone on file: 618-874-2408. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
That is up 2 ppb from 2 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Il American-South Beloit is 4 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 4 ppb |
| 2025 | 2 ppb |
| 2025 | 2 ppb |
| 2022 | 4 ppb |
| 2019 | 3 ppb |
| 2016 | 4 ppb |
Where this result ranks
Of the 1,744 Illinois systems with a lead result, the median latest reading is 0 ppb; 22 are over 15 ppb right now and 152 have gone over at some point. Il American-South Beloit's 4 ppb sits at the 85th percentile in Illinois and the 88th nationally (higher means more lead).
Nearby utilities
22 other systems share Winnebago County; 3 of them have a higher latest lead result than Il American-South Beloit. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Rockford | 147,051 | 10 ppb |
| North Park Pwd | 35,580 | 2.3 ppb |
| Loves Park | 23,335 | 2.1 ppb |
| Rockton | 7,863 | 3.2 ppb |
| Cherry Valley | 4,731 | 0 (not detected) |
| Winnebago | 2,940 | 0 (not detected) |
| Otter Creek Lake Utilities District | 2,342 | 0 (not detected) |
| Pecatonica | 2,195 | 2.6 ppb |
| Il American-Westlake | 1,493 | 1 ppb |
| Durand | 1,427 | 0 (not detected) |
Next steps for Godfrey, IL
Test your own tap with a certified lab first-draw sample; Godfrey, IL may offer free or low-cost kits through the utility. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Il American-South Beloit whether it covers that cost before hiring anyone - many utilities now do.
These figures describe homes the utility sampled, not your tap. Only your service line record or a test of your own water answers the question for your house. What a 90th-percentile result does and does not tell you: how to read a lead result. Size matters more than most people expect: small vs large water systems.