New Johnsonville Water Dept, TN
Lead detected, under the action levels
Latest 90th-percentile lead: 0.9 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
New Johnsonville Water Dept serves about 2,961 people through 1,113 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 Humphreys County, Tennessee. EPA system ID: TN0000497; phone on file: 931-535-5715. Call that number and ask whether your address has a lead, galvanized or unknown service line.
New Johnsonville Water Dept's lead record
Against the period ending 2022 (0.4 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for New Johnsonville Water Dept is 1.56 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.9 ppb |
| 2022 | 0.4 ppb |
| 2019 | 1.3 ppb |
| 2016 | 1.56 ppb |
How New Johnsonville Water Dept compares
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. New Johnsonville Water Dept's 0.9 ppb sits at the 22nd percentile in Tennessee and the 49th nationally (higher means more lead).
Neighbouring systems
2 other systems share Humphreys County; 2 of them have a higher latest lead result than New Johnsonville Water Dept. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Waverly Water Department | 9,270 | 1 ppb |
| Mcewen Waterworks | 3,594 | 1 ppb |
Next steps for New Johnsonville, TN
Test your own tap with a certified lab first-draw sample; New Johnsonville, 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 New Johnsonville Water Dept 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.