Portage Des Sioux Pws, MO
Lead detected, under the action levels
Latest 90th-percentile lead: 2.6 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
Portage Des Sioux Pws serves about 345 people through 165 service connections, which makes it a very small system under EPA's size classes. It is owned by a local government (city, town, county or district) and draws groundwater, in St. Charles County, Missouri. EPA system ID: MO6010657; phone on file: 636-899-0640. They can tell you what your service line is made of and whether they pay to replace it.
Portage Des Sioux Pws's lead record
That is down 5.4 ppb from 8 ppb in the period ending 2021. The highest 90th-percentile result EPA holds for Portage Des Sioux Pws is 8 ppb across 6 monitoring periods, none of them over 15 ppb.
| Period ending | 90th-percentile lead |
|---|---|
| 2024 | 2.6 ppb |
| 2021 | 8 ppb |
| 2021 | 8 ppb |
| 2018 | 6.71 ppb |
| 2018 | 6.71 ppb |
| 2016 | 2.85 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. Portage Des Sioux Pws's 2.6 ppb sits at the 79th percentile in Missouri and the 78th nationally (higher means more lead).
Nearby utilities
17 other systems share St. Charles County; 1 of them has a higher latest lead result than Portage Des Sioux Pws. If you are unsure which one supplies your house, the name on your water bill decides it.
| System | People | Latest lead |
|---|---|---|
| St Charles County Pwsd 2 | 100,587 | 2.28 ppb |
| 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) |
Your move
Test your own tap with a certified lab first-draw sample; Portage Des Sioux, 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 Portage Des Sioux 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. Why sampled homes are the worst-case ones is in the guide to reading the number. The action level is dropping - the 10 ppb rule from 2027.