Tri-Water System, LA
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.
Who runs the water here
Tri-Water System serves about 1,302 people through 434 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in Union Parish County, Louisiana. EPA system ID: LA1111020; phone on file: 318-368-4115. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
Against the period ending 2022 (0 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Tri-Water System is 2 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1 ppb |
| 2022 | 0 (not detected) |
| 2019 | 2 ppb |
| 2016 | 1 ppb |
Against other Louisiana systems
Of the 802 Louisiana systems with a lead result, the median latest reading is 0.72 ppb; 4 are over 15 ppb right now and 30 have gone over at some point. Tri-Water System's 1 ppb sits at the 59th percentile in Louisiana and the 54th nationally (higher means more lead).
Nearby utilities
17 other systems share Union Parish County; 7 of them have a higher latest lead result than Tri-Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Town Of Farmerville Water System | 5,352 | 1.3 ppb |
| Darbonne Ws South | 3,261 | 0 (not detected) |
| Darbonne Ws North | 3,186 | 0 (not detected) |
| Holmesville Water System | 2,406 | 0 (not detected) |
| Point Wilhite Ws | 2,292 | 0 (not detected) |
| Town Of Bernice Water System | 1,863 | 0 (not detected) |
| Rocky Branch Water System | 1,650 | 1.6 ppb |
| Linville-Haile Water System | 1,635 | 2.4 ppb |
| Union Parish Waterworks District 1 | 1,626 | 0.75 ppb |
| Wards Chapel Water System | 1,620 | 1.2 ppb |
Your move
Test your own tap with a certified lab first-draw sample; Farmerville, LA 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 Tri-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. 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.