Simpson Water Association #1, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 1.1 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
Simpson Water Association #1 serves about 1,426 people through 540 service connections, which makes it a small system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Choctaw County, Mississippi. EPA system ID: MS0100008; phone on file: 662-547-6700. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Lead results over time
Against the period ending 2022 (0.8 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Simpson Water Association #1 is 1.6 ppb across 4 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2025 | 1.1 ppb |
| 2022 | 0.8 ppb |
| 2019 | 1 ppb |
| 2017 | 1.6 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. Simpson Water Association #1's 1.1 ppb sits at the 55th percentile in Mississippi and the 57th nationally (higher means more lead).
Other water systems in Choctaw County
10 other systems share Choctaw County; 4 of them have a higher latest lead result than Simpson Water Association #1. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Reform Water Association | 1,742 | 0.9 ppb |
| Town Of Ackerman | 1,594 | 1.7 ppb |
| French Camp W/A #1 | 1,478 | 1 ppb |
| Pan Handle Water Association | 990 | 1 ppb |
| Choctaw Water Assn | 583 | 3.9 ppb |
| Town Of Weir | 560 | 1.4 ppb |
| Fentress Community W/S | 544 | 1.1 ppb |
| Union W/A | 300 | 0 (not detected) |
| Pan Handle W/A #2 | 198 | 1 ppb |
| French Camp Academy | 143 | 2.6 ppb |
Next steps for Weir, MS
Test your own tap with a certified lab first-draw sample; Weir, 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 Simpson Water Association #1 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.