Hidden Hollow Water System, TN
Lead detected, under the action levels
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. 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.
Hidden Hollow Water System at a glance
Hidden Hollow Water System serves about 82 people through 32 service connections, which makes it a very small system under EPA's size classes. It is privately owned and draws groundwater, in Stewart County, Tennessee. EPA system ID: TN0000960; phone on file: 931-232-8631. Call that number and ask whether your address has a lead, galvanized or unknown service line.
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 Hidden Hollow Water System is 1 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 1 ppb |
| 2019 | 0.5 ppb |
| 2016 | 0.5 ppb |
Against other Tennessee systems
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. Hidden Hollow Water System's 1 ppb sits at the 24th percentile in Tennessee and the 51st nationally (higher means more lead).
Nearby utilities
6 other systems share Stewart County; 0 of them have a higher latest lead result than Hidden Hollow Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| North Stewart Utility District | 6,096 | 1 ppb |
| Dover Water Dept | 4,037 | 1 ppb |
| Cumberland City Water Dept | 1,023 | 1 ppb |
| West Stewart Utility District | 629 | 1 ppb |
| Loon Bay P.O.A. | 134 | 1 ppb |
| Doalnara Restoration Soc Usa | 123 | 1 ppb |
Next steps for Dover, TN
Test your own tap with a certified lab first-draw sample; Dover, 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 Hidden Hollow Water System 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. The action level is dropping - the 10 ppb rule from 2027.