St Charles County Pwsd 2, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 2.28 ppb (monitoring period 2026-2026). 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.
Who runs the water here
St Charles County Pwsd 2 serves about 100,587 people through 39,978 service connections, which makes it a very large system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws surface water, in St. Charles County, Missouri. EPA system ID: MO6024530; phone on file: 636-385-5197. Call that number and ask whether your address has a lead, galvanized or unknown service line.
Every lead result on file
That is up 2.28 ppb from 0 ppb in the period ending 2025. The highest 90th-percentile result EPA holds for St Charles County Pwsd 2 is 2.28 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2026 | 2.28 ppb |
| 2025 | 0 (not detected) |
| 2022 | 1.14 ppb |
| 2022 | 1.14 ppb |
| 2019 | 1.29 ppb |
| 2016 | 1.03 ppb |
How St Charles County Pwsd 2 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. St Charles County Pwsd 2's 2.28 ppb sits at the 75th percentile in Missouri and the 75th nationally (higher means more lead).
Nearby utilities
17 other systems share St. Charles County; 3 of them have a higher latest lead result than St Charles County Pwsd 2. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| St Charles Pws | 78,961 | 0 (not detected) |
| St Peters Pws | 52,575 | 0 (not detected) |
| Wentzville Pws | 41,784 | 4.77 ppb |
| Ofallon Pws | 32,515 | 1.48 ppb |
| St Paul Pws | 1,700 | 0 (not detected) |
| St Charles Co Pwsd 2 Augusta | 881 | 1.47 ppb |
| St Charles Pwsd 2 Foristell | 550 | 2.32 ppb |
| Mo American Jaxson | 535 | 0 (not detected) |
| Ecm Water & Sewer Authority - Flint Hill | 469 | 0 (not detected) |
| Portage Des Sioux Pws | 345 | 2.6 ppb |
Your move
Test your own tap with a certified lab first-draw sample; O'Fallon, 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 St Charles County Pwsd 2 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. Systems that went over once often dip back under; here is what that means.