Water Health Check Report

Chesterfield, MO

Mo American St Louis St Charles Counties · Surface water source

Excellent

0 EPA violations
1 above EWG guideline

EPA · MO6010716UCMR5 PFAS data included1,111,000 people servedLast updated Dec 2025

EPA SDWIS · December 2025EPA UCMR5 · December 2024

Excellent — with 1 concern

Mo American St Louis St Charles Counties meets all federal legal limits but 1 contaminant exceeds EWG health guidelines. Lead levels within limits at treatment plant

Lead levels within limits at treatment plantAll contaminants within federal legal limits

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Contaminants tested

27 total · 1 above EWG guideline

Contaminant	Category	Level	Status
PFBA (perfluorobutanoic acid) CAS 375-22-4	pfas	5.0 ppt	Above guideline
Lithium CAS 7439-93-2	mineral	54.3 ppb	Within limits
PFHpA (perfluoroheptanoic acid) CAS 375-85-9	pfas	ND	Not detected
NEtFOSAA (N-ethyl perfluorooctane sulfonamido acetic acid) CAS 2991-50-6	pfas	ND	Not detected
PFTrDA (perfluorotridecanoic acid) CAS 72629-94-8	pfas	ND	Not detected
PFTA (perfluorotetradecanoic acid) CAS 376-06-7	pfas	ND	Not detected
9Cl-PF3ONS (9-chlorohexadecafluoro-3-oxanone-1-sulfonic acid) CAS 756426-58-1	pfas	ND	Not detected
11Cl-PF3OUdS (11-chloroeicosafluoro-3-oxaundecane-1-sulfonic acid) CAS 763051-92-9	pfas	ND	Not detected
NMeFOSAA (N-methyl perfluorooctane sulfonamido acetic acid) CAS 2355-31-9	pfas	ND	Not detected
PFUnA (perfluoroundecanoic acid) CAS 2058-94-8	pfas	ND	Not detected
PFHxA (perfluorohexanoic acid) CAS 307-24-4	pfas	ND	Not detected
PFDoA (perfluorododecanoic acid) CAS 307-55-1	pfas	ND	Not detected
PFDA (perfluorodecanoic acid) CAS 335-76-2	pfas	ND	Not detected
PFOA (perfluorooctanoic acid) CAS 335-67-1	pfas	ND	Not detected
PFOS (perfluorooctane sulfonate) CAS 1763-23-1	pfas	ND	Not detected
PFHxS (perfluorohexane sulfonic acid) CAS 355-46-4	pfas	ND	Not detected
PFBS (perfluorobutane sulfonic acid) CAS 375-73-5	pfas	ND	Not detected
PFHpS (perfluoroheptane sulfonic acid) CAS 375-92-8	pfas	ND	Not detected
PFPeS (perfluoropentane sulfonic acid) CAS 2706-91-4	pfas	ND	Not detected
PFNA (perfluorononanoic acid) CAS 375-95-1	pfas	ND	Not detected
8:2 FTS (8:2 fluorotelomer sulfonic acid) CAS 39108-34-4	pfas	ND	Not detected
4:2 FTS (4:2 fluorotelomer sulfonic acid) CAS 757124-72-4	pfas	ND	Not detected
6:2 FTS (6:2 fluorotelomer sulfonic acid) CAS 27619-97-2	pfas	ND	Not detected
ADONA (4,8-dioxa-3H-perfluorononanoic acid) CAS 919005-14-4	pfas	ND	Not detected
Lead CAS 7439-92-1	heavy metal	ND	Not detected
HFPO-DA / GenX (hexafluoropropylene oxide dimer acid) CAS 13252-13-6	pfas	ND	Not detected
PFPeA (perfluoropentanoic acid) CAS 2706-90-3	pfas	ND	Not detected

LegendWithin limitsAbove EWG guidelineAbove EPA limitNot detectedSource: EPA SDWIS · UCMR5 · EWG Health Guidelines

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Data sources

EPA SDWIS compliance data·December 2025·Annual reporting cycle

EPA UCMR5 (PFAS + lithium)·December 2024·One-time programme 2023–2025

Status flags compare detected levels against both EPA legal limits and EWG health-based guidelines—which are stricter and science-derived, independent of political feasibility.

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