Madison Suburban U.D., TN
Lead detected, under the action levels
Latest 90th-percentile lead: 1 ppb (monitoring period 2026-2028). 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
Madison Suburban U.D. serves about 84,437 people through 36,553 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in Davidson County, Tennessee. EPA system ID: TN0000424; phone on file: 615-868-4652. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Madison Suburban U.D.'s lead record
Against the period ending 2025 (1 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Madison Suburban U.D. is 1 ppb across 5 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2028 | 1 ppb |
| 2025 | 1 ppb |
| 2022 | 1 ppb |
| 2019 | 0.5 ppb |
| 2016 | 0.5 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. Madison Suburban U.D.'s 1 ppb sits at the 75th percentile in Tennessee and the 56th nationally (higher means more lead).
Nearby utilities
2 other systems share Davidson County; 1 of them has a higher latest lead result than Madison Suburban U.D.. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Metro Water Services | 789,969 | 0.8 ppb |
| Harpeth Valley U.D. | 65,518 | 4.72 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Madison, 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 Madison Suburban U.D. 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.