Is Saint Louis, MO Tap Water Safe to Drink?
Saint Louis tap water meets federal Safe Drinking Water Act standards but 1 of 3 ZIP codes 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 Saint Louis Get Its Water?
Water in Saint Louis, MO is provided by 3 public water systems: CLARK COUNTY CONS PWSD 1, CORINTH PWD and MO AMERICAN ST LOUIS ST CHARLES COUNTIES.
How Is Saint Louis Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines. Treatment includes conventional treatment (coagulation, flocculation, and filtration), groundwater disinfection, post-ozone biofiltration and slow sand filtration.
What's in Saint Louis Tap Water?
The following contaminants were detected most frequently in Saint Louis public water systems. 1 of 3 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 |
| PFBA | 0.0056 µg/L | — | 1 ZIP | Within guideline |
| HFPO-DA | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Saint Louis
Based on EPA monitoring data, 1 of 3 ZIP codes in Saint Louis 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 Saint Louis Tap Water
Is Saint Louis tap water safe to drink?
Saint Louis tap water meets Safe Drinking Water Act requirements but 1 of 3 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 Saint Louis tap water?
The most commonly detected contaminants in Saint Louis water systems include: lithium, PFTrDA, PFBA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Saint Louis get its drinking water?
Saint Louis receives water from 3 public water systems, including CLARK COUNTY CONS PWSD 1.
Do I need a water filter in Saint Louis?
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 Saint Louis tap water tested?
Public water systems in Saint Louis 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 Saint Louis
- 63145 - Saint Louis tap water report Higher concern
- 63166 - Saint Louis tap water report Some concern
- 63177 - Saint Louis tap water report Some concern
Water utilities serving Saint Louis, 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.
- ST LOUIS CITY PWSAction advised
- ST LOUIS CITY PWSAction advised