Is Clayton, MO Tap Water Safe to Drink?
Clayton tap water meets federal Safe Drinking Water Act standards but 1 of 1 ZIP code show detections above EPA health guidelines, primarily for lithium. A certified filter is recommended for households that want an additional layer of protection.
Where Does Clayton Get Its Water?
Water in Clayton, MO is provided by 2 public water systems: ST LOUIS CITY PWS and MO AMERICAN ST LOUIS ST CHARLES COUNTIES.
How Is Clayton Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines. Treatment includes conventional treatment (coagulation, flocculation, and filtration), ion exchange and slow sand filtration.
What's in Clayton Tap Water?
The following contaminants were detected most frequently in Clayton public water systems. 1 of 1 ZIP codes showed detections above EPA health guidelines.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 62.6 µg/L | 10 µg/L | 1 ZIP | Above guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Clayton
Based on EPA monitoring data, 1 of 1 ZIP codes in Clayton have recorded detections above EPA health guidelines. Sensitive populations such as infants, pregnant individuals, and those with weakened immune systems may benefit from an additional layer of protection such as a certified point-of-use filter.
Best Broad-Spectrum Filters for This Water Profile
This city profile includes PFAS detections, chlorine disinfection, and other dissolved contaminants. Reverse osmosis (RO) systems certified under NSF/ANSI 58 provide broad reduction coverage; for PFAS specifically, confirm NSF/ANSI P473 or equivalent PFAS reduction certification.
8-stage tankless RO system certified to NSF/ANSI 58, reduces 1,000+ contaminants including PFAS, lead, arsenic, fluoride, and nitrates.
See recommendations matched to your exact address: choose your ZIP code below.
Frequently Asked Questions about Clayton Tap Water
Is Clayton tap water safe to drink?
Clayton tap water meets Safe Drinking Water Act requirements but 1 of 1 ZIP codes show contaminant levels above EPA health-based guidelines. A certified point-of-use filter adds an extra layer of protection.
What contaminants are in Clayton tap water?
The most commonly detected contaminants in Clayton water systems include: lithium, PFTrDA, 11Cl-PF3OUdS. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Clayton get its drinking water?
Clayton receives water from 2 public water systems, including ST LOUIS CITY PWS.
Do I need a water filter in Clayton?
If your ZIP code is among those with detections above EPA health guidelines, choose a filter certified for the specific contaminants shown in your ZIP report. Reverse osmosis is generally the broadest option for PFAS, lithium, and many other dissolved contaminants.
How often is Clayton tap water tested?
Public water systems in Clayton are required by the EPA to test for regulated contaminants on schedules ranging from daily (for microbials and disinfectants) to annual or triennial (for many chemical contaminants). Results are published in annual Consumer Confidence Reports (CCRs). The data on this page reflects the most recent available EPA monitoring results, with the latest sample date of 2024-12-13.
Tap water reports by ZIP in Clayton
- 63105 - Clayton tap water report Higher concern
Water utilities serving Clayton, MO
Service area boundaries are approximate and based on state filings or modeled estimates. Contact your utility to confirm exact service at a specific address.
- MO AMERICAN ST LOUIS ST CHARLES COUNTIESAction advised
- ST LOUIS CITY PWSAction advised
Also covers / overlaps with
- Hadley, MO · Township
- Saint Louis, MO · Community