St. Charles County, MO · PWSID MO6010716
Mo American St Louis St Charles Counties lead service lines
10,669 lead or galvanized lines to replace
Mo American St Louis St Charles Counties reported 9,422 lead and 1,247 galvanized-requiring-replacement service lines out of 388,276 in its inventory. That's about 1 in 36 lines. Another 191,341 (49%) are still listed as unknown material.
Ranks #2 of 270 Missouri systems with confirmed lead lines, and #42 nationally.
2.7% of Mo American St Louis St Charles Counties's service lines are lead or galvanized requiring replacement. That's about the same as the Missouri average (3.3%) and about the same as the national average (3.1%).
- Lead 2.4%
- Galvanized (replace) 0.3%
- Unknown 49%
- Non-lead 48%
Total service lines reported: 388,276. Reported all required service line types. Population served: 1,111,000; 376,501 connections.
Lead test results
Mo American St Louis St Charles Counties's most recent 90th-percentile lead result (Jul 2024–Dec 2024) was 1 ppb, below both the 15 ppb action level and the 10 ppb level that takes effect in 2027. This means 90% of homes sampled were at or below that level; individual homes, especially those with lead lines, can be higher.
Lead and Copper Rule 90th-percentile results reported to EPA, in parts per billion. Dashed lines: 15 ppb action level and the 10 ppb level from November 1, 2027.
Progress since 2025 Q1
Reported lead and galvanized-requiring-replacement lines went from 10,669 in 2025 Q1 to 10,669 in 2026 Q3: no change. Lines of unknown material went from 191,341 to 191,341, no change.
Quarterly counts reported to EPA. A drop usually means lines were replaced or confirmed non-lead; a rise usually means more lines were identified. Replacement progress rankings.
Lead rule violations
EPA's data lists no Lead and Copper Rule violations for Mo American St Louis St Charles Counties since 2015. That covers testing, reporting, corrosion control and public notice requirements; it isn't a guarantee about any individual home.
Source: EPA SDWIS violation records for the Lead and Copper Rule.
Where the water comes from
Mo American St Louis St Charles Counties's main water source is surface water (rivers, lakes or reservoirs). It buys treated water from St Louis City PWS. The seller treats the water, including corrosion control that keeps lead from dissolving out of pipes, while Mo American St Louis St Charles Counties is responsible for its own service line inventory and replacement program. It sells water to 10 other water systems: Kirkwood PWS, Ofallon PWS, St Charles PWS, Jefferson County PWSD 1, Jefferson County PWSD 2, Jefferson County PWSD 3, Jefferson Co Cons PWSD C 1, Jefferson County PWSD 10, Weldon Spring Heights Village PWS, Terrisan.
Source: EPA SDWIS water system and facility records.
Check your own address
These counts cover the whole system. To see whether your line is lead, use the utility's address-level inventory. Utilities had to prepare one by October 16, 2024 and make it publicly accessible; systems serving more than 50,000 people must post it online.
No map yet? Do the 2-minute scratch and magnet test on the pipe where water enters your home.
Protect your drinking water now
If your line is lead, galvanized or unknown, filter water for drinking, cooking and baby formula. Use a filter certified to NSF/ANSI 53 for lead. Run cold water for a few minutes after it sits for hours, and never use hot tap water for cooking.
How to pick a lead-certified filter · How to test your water for lead
Getting the line replaced
EPA's Lead and Copper Rule Improvements require most systems to replace lead and galvanized-requiring-replacement lines by December 31, 2037. Ask Mo American St Louis St Charles Counties whether it replaces the private side for free or with a cost share before you hire anyone. If you want it done sooner, or your utility doesn't cover your side, a licensed plumber can quote it. What replacement costs.
County pages: Lead pipes in St. Charles County · Lead pipes in St. Louis County
Cities served
- Lead pipes in Florissant
- Lead pipes in Chesterfield
- Lead pipes in Wildwood
- Lead pipes in University
- Lead pipes in Ballwin
- Lead pipes in Maryland Heights
- Lead pipes in Hazelwood
- Lead pipes in Webster Groves
- Lead pipes in Creve Coeur
- Lead pipes in Manchester
- Lead pipes in Ferguson
- Lead pipes in Clayton
- Lead pipes in Overland
- Lead pipes in Eureka
- Lead pipes in Jennings
- Lead pipes in St. Ann
- Lead pipes in Crestwood
- Lead pipes in Town and Country
- Lead pipes in Bridgeton
- Lead pipes in Bellefontaine Neighbors
- Lead pipes in Ellisville
- Lead pipes in Sunset Hills
- Lead pipes in Richmond Heights
- Lead pipes in Olivette
ZIP codes served
ZIP codes whose center falls inside Mo American St Louis St Charles Counties's mapped service area (EPA service area boundaries). Neighboring utilities may serve parts of the same ZIP.
63005630116301763021630256302663031630336303463038630406304263043630446304563074630886310563114631176311963121631236312463125631266312763128631296313063131631326313363135631366313763140631416314363144631466330363304
Other water systems nearby
| System | Lead + galv. | Unknown |
|---|---|---|
| St Charles County PWSD 2 | 0 | 4,452 |
| St Charles PWS | 7 | 365 |
| St Peters PWS | 0 | 2,860 |
| Wentzville PWS | 1 | 2 |
| Ofallon PWS | 1 | 13,001 |
| St Charles Co PWSD 2 Augusta | 0 | 153 |
| St Charles PWSD 2 Foristell | 0 | 56 |
| Portage Des Sioux PWS | 0 | 73 |
Check another water system
Questions
Does Mo American St Louis St Charles Counties have lead pipes?
Yes. Mo American St Louis St Charles Counties reported 9,422 lead service lines and 1,247 galvanized lines that must be replaced, out of 388,276 total. 191,341 more are of unknown material.
How do I check if my home's service line is lead?
Look up your address on Mo American St Louis St Charles Counties's official service line inventory, which utilities must make publicly available. You can also scratch the pipe where it enters your home: lead is soft, dull gray, scratches to shiny silver and does not attract a magnet.
When will Mo American St Louis St Charles Counties replace lead service lines?
Under EPA's Lead and Copper Rule Improvements, most systems must replace lead and galvanized-requiring-replacement lines by December 31, 2037, starting from November 1, 2027. The rule is being challenged in court, so dates could change. Many utilities run free or cost-share programs now.
Has Mo American St Louis St Charles Counties had lead violations?
EPA's data shows no Lead and Copper Rule violations since 2015 for Mo American St Louis St Charles Counties.
Which water filters remove lead?
Use a filter certified to NSF/ANSI Standard 53 for lead reduction, or NSF/ANSI 58 for reverse osmosis. Check the certification on NSF's listings, not just the box.
Embed or cite this data
Local news sites, blogs and community groups can embed this card. It updates when EPA releases new data.
Citation: Lead Pipe Map, "Mo American St Louis St Charles Counties lead service lines," https://leadpipemap.com/mo/mo-american-st-louis-st-charles-counties/. Source: EPA SDWIS service line inventory, 2026 Q3. Download the full dataset on the data page.