Thorntown Utilities, IN
Lead detected, under the action levels
Latest 90th-percentile lead: 1.17 ppb (monitoring period 2023-2025). 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
Thorntown Utilities serves about 1,600 people through 676 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 groundwater, in Boone County, Indiana. EPA system ID: IN5206005; phone on file: 765-436-2627. They can tell you what your service line is made of and whether they pay to replace it.
Thorntown Utilities's lead record
The highest 90th-percentile result EPA holds for Thorntown Utilities is 1.17 ppb across 1 monitoring period, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.17 ppb |
How Thorntown Utilities compares
Of the 687 Indiana systems with a lead result, the median latest reading is 1.31 ppb; 6 are over 15 ppb right now and 36 have gone over at some point. Thorntown Utilities's 1.17 ppb sits at the 46th percentile in Indiana and the 58th nationally (higher means more lead).
Other water systems in Boone County
6 other systems share Boone County; 1 of them has a higher latest lead result than Thorntown Utilities. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Lebanon Utilities | 16,840 | 1.05 ppb |
| Citizens Water - Whitestown | 15,695 | 0.33 ppb |
| Jamestown Municipal Water | 1,000 | 0 (not detected) |
| Advance Water Works | 500 | 0 (not detected) |
| Pine Ridge | 135 | 4.63 ppb |
| Zionsville Mhp Trust | 57 | 0 (not detected) |
What to do in your house
Test your own tap with a certified lab first-draw sample; Thorntown, IN 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 Thorntown Utilities 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. The action level is dropping - the 10 ppb rule from 2027.