Farmington Pws, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 4.82 ppb (monitoring period 2022-2024). 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
Farmington Pws serves about 18,217 people through 6,255 service connections, which makes it a large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in St. Francois County, Missouri. EPA system ID: MO4010270; phone on file: 573-756-1701. Ask them for your address in their service line inventory - every system had to publish one by Oct 2024.
Lead results over time
Against the period ending 2022 (4.28 ppb) the latest result is about the same. The highest 90th-percentile result EPA holds for Farmington Pws is 14.2 ppb across 8 monitoring periods, none of them over 15 ppb (1 over 10 ppb).
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 4.82 ppb |
| 2022 | 4.28 ppb |
| 2021 | 4.28 ppb |
| 2021 | 4.28 ppb |
| 2019 | 8.64 ppb |
| 2018 | 8.64 ppb |
| 2018 | 8.64 ppb |
| 2016 | 14.2 ppb over 10 |
How Farmington Pws compares
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. Farmington Pws's 4.82 ppb sits at the 91st percentile in Missouri and the 90th nationally (higher means more lead).
Nearby utilities
19 other systems share St. Francois County; 5 of them have a higher latest lead result than Farmington Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| Park Hills Pws | 8,587 | 8.6 ppb |
| Desloge Pws | 5,034 | 3.69 ppb |
| Bonne Terre Pws | 3,537 | 12.9 ppb |
| Bonne Terre Prison | 3,500 | 8.07 ppb |
| Farmington Correctional Center | 3,500 | 0 (not detected) |
| Terre Du Lac | 3,200 | 3.9 ppb |
| Bismarck Pws | 1,475 | 1.9 ppb |
| Leadwood Pws | 1,200 | 1.11 ppb |
| St Francois County Pwsd 2 | 850 | 1.51 ppb |
| Pilot Knob Rural Wd 1 Doe Run Area | 507 | 1.4 ppb |
Next steps for Farmington, MO
Test your own tap with a certified lab first-draw sample; Farmington, 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 Farmington Pws 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.