Tilden, IL
Lead reported as not detected
Latest 90th-percentile lead: reported as 0 (not detected) (monitoring period 2021-2023). The federal action level is 15 ppb today and drops to 10 ppb in Nov 2027; EPA's health goal is 0. The latest 90th-percentile result was reported as 0 (not detected at the lab's limit). That says the sampled homes were low, not that your home has no lead service line. Check your utility's service line inventory for your address.
About Tilden
Tilden serves about 1,350 people through 560 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Randolph County, Illinois. EPA system ID: IL1570700; phone on file: 618-587-5191. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
That is down 2.66 ppb from 2.66 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for Tilden is 4.75 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0 (not detected) |
| 2020 | 2.66 ppb |
| 2017 | 4.75 ppb |
Against other Illinois systems
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. Tilden's reported as 0 (not detected) sits at the 36th percentile in Illinois and the 28th nationally (higher means more lead). Systems reporting 0 tie at the bottom, so the rank mostly reflects size among them.
Other water systems in Randolph County
13 other systems share Randolph County; 7 of them have a higher latest lead result than Tilden. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Chester | 8,407 | 2.6 ppb |
| Sparta | 4,395 | 5.2 ppb |
| Red Bud | 3,804 | 6 ppb |
| Menard Correctional Center | 2,950 | - |
| Egyptian Water Company | 2,543 | 0 (not detected) |
| Steeleville | 1,960 | 2.3 ppb |
| Coulterville | 1,052 | 1.6 ppb |
| Percy | 961 | 8.3 ppb |
| Prairie Du Rocher | 759 | 7 ppb |
| Evansville | 660 | 0 (not detected) |
Next steps for Tilden, IL
Look up your address in Tilden's service line inventory. If it says lead, galvanized or unknown, test your tap. If your own line is lead, replacing the private side runs about $1,200-$12,300 (EPA average about $4,700). Ask Tilden 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. Why sampled homes are the worst-case ones is in the guide to reading the number. Small systems behave differently: why small systems go over more often.