Old Union Water System, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 0.7 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
Old Union Water System serves about 3,749 people through 1,420 service connections, which makes it a medium-sized system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Lee County, Mississippi. EPA system ID: MS0410033; phone on file: 662-995-1269. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Old Union Water System's lead record
That is down 1.1 ppb from 1.8 ppb in the period ending 2022. The highest 90th-percentile result EPA holds for Old Union Water System is 1.8 ppb across 7 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 0.7 ppb |
| 2022 | 1.8 ppb |
| 2022 | 1 ppb |
| 2021 | 1 ppb |
| 2019 | 0.8 ppb |
| 2018 | 0.8 ppb |
| 2016 | 0.9 ppb |
Where this result ranks
Of the 973 Mississippi systems with a lead result, the median latest reading is 1 ppb; 9 are over 15 ppb right now and 44 have gone over at some point. Old Union Water System's 0.7 ppb sits at the 35th percentile in Mississippi and the 47th nationally (higher means more lead).
Nearby utilities
22 other systems share Lee County; 9 of them have a higher latest lead result than Old Union 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 Tupelo | 37,000 | 0 (not detected) |
| Town Of Saltillo | 6,766 | 0.5 ppb |
| Mooreville-Richmond W/A #1 | 3,807 | 0 (not detected) |
| Town Of Guntown | 3,577 | 0 (not detected) |
| Mooreville Richmond #3 | 3,419 | 1 ppb |
| Mooreville-Richmond W/A #2 | 3,200 | 2.7 ppb |
| City Of Verona | 2,792 | 0.55 ppb |
| North Lee W/A #1-Barnes Crosng | 2,672 | 0.9 ppb |
| North Lee W/A-Beech Springs | 2,556 | 0.5 ppb |
| City Point Water Association | 2,479 | 0.6 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Shannon, MS 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 Old Union 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. Systems that went over once often dip back under; here is what that means.