Jefferson County Pwsd 12, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 1.36 ppb (monitoring period 2024-2026). 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.
Jefferson County Pwsd 12 at a glance
Jefferson County Pwsd 12 serves about 3,300 people through 1,507 service connections, which makes it a small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in Jefferson County, Missouri. EPA system ID: MO6024304; phone on file: 636-937-9697. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is down 1.83 ppb from 3.19 ppb in the period ending 2023. The highest 90th-percentile result EPA holds for Jefferson County Pwsd 12 is 9.89 ppb across 8 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 1.36 ppb |
| 2023 | 3.19 ppb |
| 2023 | 3.19 ppb |
| 2022 | 9.89 ppb |
| 2020 | 9.89 ppb |
| 2019 | 3.77 ppb |
| 2017 | 3.77 ppb |
| 2016 | 6.78 ppb |
Where this result ranks
Of the 1,674 Missouri systems with a lead result, the median latest reading is 1.04 ppb; 2 are over 15 ppb right now and 74 have gone over at some point. Jefferson County Pwsd 12's 1.36 ppb sits at the 58th percentile in Missouri and the 61st nationally (higher means more lead).
Nearby utilities
65 other systems share Jefferson County; 35 of them have a higher latest lead result than Jefferson County Pwsd 12. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Jefferson Co Cons Pwsd C 1 | 37,000 | 0 (not detected) |
| Jefferson County Pwsd 1 | 21,113 | 7.25 ppb |
| Jefferson County Pwsd 3 | 17,000 | 0 (not detected) |
| Jefferson County Pwsd 2 | 16,548 | 0 (not detected) |
| Festus Pws | 13,000 | 0 (not detected) |
| Jefferson County Pwsd 10 | 10,000 | 3.86 ppb |
| Jefferson County Pwsd 5 | 8,000 | 1.13 ppb |
| Jefferson County Pwsd 6 | 7,500 | 2.93 ppb |
| Desoto Pws | 6,400 | 1.46 ppb |
| Jefferson County Pwsd 7 | 6,100 | 1.7 ppb |
What to do in your house
Test your own tap with a certified lab first-draw sample; Festus, MO 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 Jefferson County Pwsd 12 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. The lead result guide covers how utilities pick the homes they sample. The action level is dropping - the 10 ppb rule from 2027.