St Thomas Water Association, MS
Lead detected, under the action levels
Latest 90th-percentile lead: 0.8 ppb (monitoring period 2021-2023). 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
St Thomas Water Association serves about 500 people through 182 service connections, which makes it a very small system under EPA's size classes. It is under mixed public and private ownership and draws groundwater, in Hinds County, Mississippi. EPA system ID: MS0250024; phone on file: 601-866-4105. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
That is down 1.9 ppb from 2.7 ppb in the period ending 2020. The highest 90th-percentile result EPA holds for St Thomas Water Association is 2.7 ppb across 3 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2023 | 0.8 ppb |
| 2020 | 2.7 ppb |
| 2017 | 1.4 ppb |
How St Thomas Water Association compares
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. St Thomas Water Association's 0.8 ppb sits at the 38th percentile in Mississippi and the 48th nationally (higher means more lead).
Other water systems in Hinds County
19 other systems share Hinds County; 17 of them have a higher latest lead result than St Thomas Water Association. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| City Of Jackson | 189,673 | 3.2 ppb |
| City Of Jackson-Maddox Rd. | 28,098 | 2.2 ppb |
| City Of Clinton | 25,000 | 1 ppb |
| South Central Water Assn | 12,260 | 2 ppb |
| North Hinds W/A #1-Brownsville | 4,277 | 1.2 ppb |
| Reedtown Water Assn | 3,260 | 3.5 ppb |
| City Of Raymond | 2,788 | 1 ppb |
| North Hinds W/A #6-Shepherd Hills | 2,785 | 1.1 ppb |
| Town Of Edwards | 1,980 | 0.8 ppb |
| North Hinds W/A #2-Chapel Hill | 1,595 | 3.4 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Bolton, 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 St Thomas Water Association 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. Size matters more than most people expect: small vs large water systems.