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WaterSafeCheck

Defiance, MO Tap Water Quality

Water safety reports for all 1 ZIP code in Defiance, Missouri

Average Score

53/100

Health Violations

22

ZIP Codes

1

High Lead Risk

0

of 1 ZIP codes

D

About Tap Water in Defiance, MO

Tap water quality in Defiance, MO is a significant concern, currently receiving a below-average safety score of 53/100 across 1 ZIP code. With 22 health-based violations recorded in the past 5 years, systems like St Charles County Pwsd 2 have struggled to maintain compliance with EPA regulations enforced by Missouri Department of Natural Resources. Residents are strongly encouraged to utilize certified water filtration systems.

The accumulation of 22 health-based violations over the past 5 years highlights systemic challenges within Defiance's water infrastructure. When violations occur, it means that drinking water tests revealed contaminant levels exceeding safe limits, triggering mandatory corrective actions by Missouri Department of Natural Resources. The city relies on surface water, which may require significant treatment upgrades to address these recurring issues.

Fortunately, the modeled risk for widespread lead exposure in Defiance's municipal water is relatively low compared to national averages. However, because lead typically enters drinking water through the corrosion of older, individual home plumbing rather than the main supply lines, residents in homes built before 1986 should still exercise caution by running the tap before use.

Health-Based Contaminant Violations in Defiance

EPA records indicate that the following contaminants have exceeded Safe Drinking Water Act Maximum Contaminant Levels (MCLs) in Defiance water systems over the past 5 years.

Gross BetaConsumer Confidence Report RuleContaminant 0700

Note: The presence of a past violation does not necessarily mean current water is unsafe. Utilities are required to take corrective action. Review your Consumer Confidence Report for the latest status.

Water Quality by ZIP Code — Defiance, MO

Click any ZIP code for the full water quality report

D
63341

Defiance, MO

Score: 53/10022 violations

Frequently Asked Questions — Defiance Water Quality

Is tap water safe to drink in Defiance, MO?+
Tap water in Defiance has a grade of D, indicating compliance concerns in recent years. Families with young children or pregnant women should consider using a certified NSF/ANSI 53 water filter for drinking and cooking.
What is the water quality score for Defiance?+
The average water quality score across 1 ZIP code in Defiance, MO is 53/100. Scores are derived from EPA violation history, lead levels, enforcement actions, and infrastructure risk indicators. Individual ZIP codes may vary — search your specific ZIP above for a personalized report.
Does Defiance have lead in its tap water?+
Lead risk ratings in Defiance are relatively low based on EPA monitoring data. However, lead in home plumbing is a separate concern — if your home was built before 1986, individual tap testing is recommended.
How do I get the water quality report for Defiance?+
Each ZIP code in Defiance has a full water quality report on this site — click any ZIP code below. You can also get the annual Consumer Confidence Report (CCR) from your local water utility. The CCR is required to be published every year by July 1 and contains actual contaminant measurements and violation history.
Where does Defiance's tap water come from?+
Tap water in Defiance, MO primarily comes from surface water. Surface water systems treat water from rivers, lakes, or reservoirs using filtration, sedimentation, and disinfection before it reaches your tap.

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