Monticello Water System, LA
Lead detected, under the action levels
Latest 90th-percentile lead: 3 ppb (monitoring period 2026-2026). 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.
About Monticello Water System
Monticello Water System serves about 1,104 people through 368 service connections, which makes it a small system under EPA's size classes. It is privately owned and draws groundwater, in East Carroll Parish County, Louisiana. EPA system ID: LA1035004; phone on file: 318-418-5905. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Monticello Water System's lead record
That is down 2.4 ppb from 5.4 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for Monticello Water System is 7 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 3 ppb |
| 2025 | 5.4 ppb |
| 2024 | 5 ppb |
| 2023 | 3 ppb |
| 2023 | 6 ppb |
| 2022 | 3 ppb |
| 2019 | 3 ppb |
| 2016 | 7 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. Monticello Water System's 3 ppb sits at the 88th percentile in Louisiana and the 82nd nationally (higher means more lead).
Other water systems in East Carroll Parish County
3 other systems share East Carroll Parish County; 0 of them have a higher latest lead result than Monticello Water System. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Lake Providence Water System | 5,850 | 1 ppb |
| East Carroll Ws South | 1,071 | 1.6 ppb |
| East Carroll Ws North | 45 | 3 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Lake Providence, 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 Monticello Water System whether it covers that cost before hiring anyone - many utilities now do. Its latest copper 90th percentile is 1410 ppb (copper action level 1,300 ppb).
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.