Is Defiance, MO Tap Water Safe to Drink?
Defiance, MO tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Contaminants including lithium have been detected at or below guideline thresholds.
Where Does Defiance Get Its Water?
Water in Defiance, MO is provided by 1 public water system: THOMAS HILL PWSD 1.
How Is Defiance Tap Water Treated?
Treated water is disinfected using free chlorine and calcium hypochlorite and chloramines and on-site generated disinfectant. Treatment includes air stripping, conventional treatment (coagulation, flocculation, and filtration), granular activated carbon filtration and in-line filtration.
What's in Defiance Tap Water?
The following contaminants were detected most frequently in Defiance public water systems. All detected levels fall at or below EPA health guidelines in this dataset.
| Contaminant | Peak detected | EPA guideline | ZIPs detected | Status |
|---|---|---|---|---|
| lithium | 9 µg/L | — | 0 ZIPs | Within guideline |
| PFBA | 0.0073 µg/L | — | 1 ZIP | Within guideline |
| PFTrDA | 0.007 µg/L | — | 0 ZIPs | Within guideline |
| 11Cl-PF3OUdS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
| 8:2 FTS | 0.005 µg/L | — | 0 ZIPs | Within guideline |
Health Risk Profile for Defiance
Current EPA monitoring data for Defiance shows contaminant levels within guideline thresholds across all ZIP codes in this dataset. As with all public water systems, sensitive populations may choose to use a certified filter for additional peace of mind.
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 Defiance Tap Water
Is Defiance tap water safe to drink?
Defiance tap water currently meets EPA health guidelines across all monitored ZIP codes in this dataset. Sensitive populations may still choose to use a certified filter as a precaution.
What contaminants are in Defiance tap water?
The most commonly detected contaminants in Defiance water systems include: lithium, PFBA, PFTrDA. See the ZIP-level reports for exact measurements and EPA guideline comparisons.
Where does Defiance get its drinking water?
Defiance receives water from one public water system, including THOMAS HILL PWSD 1.
Do I need a water filter in Defiance?
Current data does not show guideline exceedances in Defiance. A certified filter can still reduce trace contaminants and improve taste for households that prefer filtered water.
How often is Defiance tap water tested?
Public water systems in Defiance 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 2025-01-13.
Tap water reports by ZIP in Defiance
- 63341 - Defiance tap water report Some concern
Water utilities serving Defiance, 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 CHARLES COUNTY PWSD 2Action advised
Also covers / overlaps with
- Boone, MO · Township
- New Melle, MO