Is Dearborn, MO Tap Water Safe to Drink?
Graded B, with 11 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
78.7/100
waterverge.com Dearborn, MO — Water Quality Report
Dearborn's drinking water received a grade of B (78.7 out of 100), indicating good water quality. The city's 2 water systems serve approximately 2,530 residents using purchased surface water.
Lead levels were measured at 3.4 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 27 violations on record, including 9 health-based violations. 11 remain unresolved.
What to know about Dearborn's water
Dearborn ranks #332 out of 509 cities in Missouri for water quality, placing it below average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
As a small community water system, Dearborn may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Dearborn, MO water safe to drink?
Dearborn's drinking water has significant quality concerns based on EPA testing data. With a grade of B (78.7/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,530 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Dearborn
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Dearborn's water quality assessment. Grade: B (78.7/100).
Contaminants: LEAD AND COPPER RULE REVISIONS, Consumer Confidence Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4435). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4012). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Dearborn's water supply.
Well within EPA limits.
Violation history
Dearborn's water system has 27 total violations on record, including 9 health-based violations. 11 remain unresolved. 3 violations were issued in the last 5 years.
Flood & environmental risk
Platte County has experienced 10 federally declared disasters since 1973. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies. Local water sources include Platte River At Sharps Station.
Where does Dearborn's water come from?
Dearborn's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 2 water systems serving approximately 2,530 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Platte River At Sharps Station (river).
What Dearborn residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Dearborn's water.
Your water utility is required to publish an annual Consumer Confidence Report (CCR) with detailed testing results. Ask for the latest copy or check your utility's website.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Dearborn's area has a history of flooding. After severe weather, watch for boil water advisories from your local utility.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Flood & disaster history
Platte County has experienced 10 federally declared disasters since 1973. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 3.4 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Dearborn compares by contaminant
Explore where Dearborn ranks among all Missouri cities for specific contaminants.
Water source & infrastructure
Where Dearborn's water comes from
Dearborn's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 2,530 people through 2 water systems.
Water bodies near Dearborn
Dearborn is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Dearborn
| System Name | PWSID | Population | Source |
|---|---|---|---|
| PLATTE CO PWSD 9 | MO1024483 | 1,860 | SWP |
| DEARBORN PWS | MO1010204 | 670 | SWP |
How Dearborn compares
Full Missouri rankings →Dearborn's score of 78.7/100 is above the average of 62/100 among major Missouri cities. It outscores 6 of 10 nearby cities.
Nearby cities
View Missouri rankings →About Dearborn, MO
Learn more about your water
Guides and resources related to Dearborn's water quality findings.
Explore water quality across Platte
Frequently asked questions
Is Dearborn, MO tap water safe to drink?
Dearborn's water quality earned a grade of B (78.7/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #332 out of 509 cities tested in Missouri.
What contaminants are in Dearborn's water?
Lead was measured at 3.4 ppb (90th percentile). 27 violations are on record.
How is Dearborn's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Dearborn?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Dearborn's water come from?
Dearborn's water is sourced from Purchased surface water. The city has 2 water systems serving approximately 2,530 residents.
What health violations has Dearborn's water system had?
Dearborn has 9 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 11 violations remain unresolved.
How does Dearborn's water compare to other cities?
Dearborn ranks #332 out of 509 cities in Missouri (better than 35% of state cities) and #8570 out of 15744 cities nationally (46th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.