Is Unionville, 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 ↓
73.1/100
waterverge.com Unionville, MO — Water Quality Report
Unionville's drinking water received a grade of B- (73.1 out of 100), indicating fair water quality. The city's 3 water systems serve approximately 5,317 residents using purchased surface water.
Lead levels were measured at 0.0 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 48 violations on record, including 22 health-based violations. 11 remain unresolved.
What to know about Unionville's water
Unionville ranks #375 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.
The system has seen 9 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Unionville, MO water safe to drink?
Unionville's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (73.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 5,317 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Unionville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Unionville's water quality assessment. Grade: B- (73.1/100).
Contaminants: Revised Total Coliform Rule.
Contaminants: Revised Total Coliform Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3232). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-995). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Unionville's water supply.
Well within EPA limits.
Violation history
Unionville's water system has 48 total violations on record, including 22 health-based violations. 11 remain unresolved. 9 violations were issued in the last 5 years.
Flood & environmental risk
Putnam County has experienced 3 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.
Where does Unionville's water come from?
Unionville's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 3 water systems serving approximately 5,317 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Unionville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Unionville'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.
Unionville'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
Top industrial polluters within 10 miles of Unionville
Industrial polluters nearby
Reported releases to surface water by facilities near Unionville, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
MURPHY BROWN OF MISSOURI LLC-LUCERNE FEEDMILL LUCERNE, MO64655 | — | — | 9.6 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Putnam County has experienced 3 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Unionville compares by contaminant
Explore where Unionville ranks among all Missouri cities for specific contaminants.
Water source & infrastructure
Where Unionville's water comes from
Unionville'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 5,317 people through 3 water systems.
Water systems serving Unionville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| PUTNAM COUNTY PWSD 1 | MO2024495 | 2,997 | SWP |
| UNIONVILLE PWS | MO2010804 | 1,735 | SWP |
| LAKE THUNDERHEAD | MO2036165 | 585 | SWP |
How Unionville compares
Full Missouri rankings →Unionville's score of 73.1/100 is above the average of 62/100 among major Missouri cities. It outscores 5 of 10 nearby cities.
Nearby cities
View Missouri rankings →About Unionville, MO
Learn more about your water
Guides and resources related to Unionville's water quality findings.
Explore water quality across Putnam
Frequently asked questions
Is Unionville, MO tap water safe to drink?
Unionville's water quality earned a grade of B- (73.1/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #375 out of 509 cities tested in Missouri.
What contaminants are in Unionville's water?
Lead was measured at 0.0 ppb (90th percentile). 48 violations are on record.
How is Unionville'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 Unionville?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Unionville's water come from?
Unionville's water is sourced from Purchased surface water. The city has 3 water systems serving approximately 5,317 residents.
What health violations has Unionville's water system had?
Unionville has 22 health-based violations on record. The most recent violation was recorded in November 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 11 violations remain unresolved.
How does Unionville's water compare to other cities?
Unionville ranks #375 out of 509 cities in Missouri (better than 26% of state cities) and #10155 out of 15744 cities nationally (36th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.