Home hazard report for 63338 — Cottleville, MO
ZIP 63338 is served by MO American St Louis St Charles Counties: no health-based violations since 2016, latest lead result 1 ppb, PFAS 1 detected. Saint Charles is in EPA radon no zone.
No health-based violations reported since 2016.
90th-percentile lead in the latest round (Jul 2024). Lead comes mostly from household plumbing and service lines, so individual homes can be higher.
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
EPA has not assigned this area a radon zone. Testing is the only way to know.
The nearest active Superfund site is 5.1 miles away.
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Where ZIP 63338 is
blue: utility service area · scroll or pinch to zoomDrinking water: MO American St Louis St Charles Counties
Health-based violations
No health-based violations reported since 2016.
Lead
90th-percentile lead per sampling round (90% of the homes sampled were at or below this level). Black line: EPA’s 15 ppb action level; under the Lead and Copper Rule Improvements the action level becomes 10 ppb from 2027.
PFAS (“forever chemicals”)
| Compound | Highest result | Samples with detection | EPA limit |
|---|---|---|---|
| PFBA | 5.1 ppt | 2 of 24 | — |
| PFNA | not detected | 0 of 24 | — |
| PFHxS | not detected | 0 of 24 | — |
| PFHpA | not detected | 0 of 24 | — |
| PFBS | not detected | 0 of 24 | — |
| PFPeA | not detected | 0 of 24 | — |
| PFOS | not detected | 0 of 24 | 4 ppt MCL |
| PFOA | not detected | 0 of 24 | 4 ppt MCL |
| PFDA | not detected | 0 of 24 | — |
| PFHxA | not detected | 0 of 24 | — |
| HFPO-DA (GenX) | not detected | 0 of 24 | — |
EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5), samples 2023–2025; ppt = parts per trillion (ng/L). The 4.0 ppt maximum contaminant levels for PFOA and PFOS were set by EPA in 2024; water systems have until the end of the decade to comply.
Radon in Saint Charles
EPA radon no zone — not mapped. EPA has not assigned this area a radon zone. Testing is the only way to know.
Radon is a colorless, odorless radioactive gas from soil and rock, and the leading cause of lung cancer among non-smokers. EPA recommends fixing a home at 4 pCi/L or above and considering it from 2 pCi/L. A short-term test kit costs about $15–30. How radon zones work →
Superfund sites nearby
| Site | Status | Distance |
|---|---|---|
| Weldon Spring Quarry/Plant/Pits (USDOE/Army) St. Charles County, Missouri · EPA ID MO3210090004 | Active (final NPL) | 5.1 mi |
| Weldon Spring Former Army Ordnance Works St. Charles County, Missouri · EPA ID MO5210021288 | Active (final NPL) | 5.3 mi |
EPA Superfund National Priorities List (NPL): the country’s most serious known hazardous-waste sites, each with an EPA cleanup record (linked). Distance is measured from the ZIP center to the site’s reference point; being near a site does not by itself mean exposure — EPA site pages describe what was found and how it is being cleaned up.
What this is — and isn’t. These are records your water utility and state reported to the EPA, and the EPA’s radon map for your county. They describe the system and the area, not the water from your own tap or the air in your home. For that, read your utility’s annual Consumer Confidence Report and test: lead and radon tests are inexpensive.
Questions about 63338
Who supplies drinking water to ZIP 63338?
MO American St Louis St Charles Counties (EPA ID MO6010716), a surface water (rivers, lakes) system serving about 1,111,000 people.
Is there lead in Cottleville, MO tap water?
The utility’s latest 90th-percentile lead result (Jul 2024) was 1 ppb; EPA’s action level is 15 ppb, falling to 10 ppb from 2027. Lead mostly comes from service lines and home plumbing, so the only way to know your tap is to test it.
Does Cottleville, MO water have PFAS?
PFAS were detected, with PFOA and PFOS below 4.0 ppt (highest not detected).
Has the water system in 63338 had violations?
No health-based violations reported since 2016.
Are there Superfund sites near 63338?
The nearest active Superfund site is 5.1 miles away. Sites within 10 miles: Weldon Spring Quarry/Plant/Pits (USDOE/Army) (5.1 mi, Active (final NPL)); Weldon Spring Former Army Ordnance Works (5.3 mi, Active (final NPL)).
Is radon a problem in Saint Charles?
Saint Charles is in EPA radon no zone (not mapped). EPA has not assigned this area a radon zone. Testing is the only way to know.