Old Hickory Wat Co-Union County, TN
Exceeded the action level in the past
Latest 90th-percentile lead: 1 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. The latest result is under the action level, but this system has gone over 15 ppb before. Lead comes from pipes, not the source water, so a home with a lead service line can still be exposed. Test your own tap.
About Old Hickory Wat Co-Union County
Old Hickory Wat Co-Union County serves about 342 people through 134 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws surface water, in Union County, Tennessee. EPA system ID: TN0000899; phone on file: 865-992-5241. They can tell you what your service line is made of and whether they pay to replace it.
Lead results over time
Against the period ending 2022 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Old Hickory Wat Co-Union County is 20.6 ppb across 8 monitoring periods, 1 of them over the 15 ppb action level.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 1 ppb |
| 2021 | 0.76 ppb |
| 2021 | 1.7 ppb |
| 2019 | 1.24 ppb |
| 2019 | 20.6 ppb over 15 |
| 2019 | 0.54 ppb |
| 2016 | 8.1 ppb |
Where this result ranks
Of the 453 Tennessee systems with a lead result, the median latest reading is 1 ppb; 0 are over 15 ppb right now and 10 have gone over at some point. Old Hickory Wat Co-Union County's 1 ppb sits at the 26th percentile in Tennessee and the 53rd nationally (higher means more lead).
Other water systems in Union County
3 other systems share Union County; 2 of them have a higher latest lead result than Old Hickory Wat Co-Union County. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Luttrell-Blaine-Corryton U.D. | 10,529 | 1 ppb |
| Maynardville Water Dept | 7,940 | 2 ppb |
| Leadmine Bend Water Assoc. | 120 | 1.5 ppb |
Next steps for Maynardville, TN
Test your own tap with a certified lab first-draw sample; Maynardville, TN 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 Old Hickory Wat Co-Union County 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. The lead result guide covers how utilities pick the homes they sample. Why an old exceedance still matters: over the limit before, under it now.