Is Vienna, IL Tap Water Safe to Drink?
Graded B, with 8 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
77.3/100
waterverge.com Vienna, IL — Water Quality Report
Vienna's drinking water received a grade of B (77.3 out of 100), indicating good water quality. The city's 3 water systems serve approximately 3,736 residents using 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 163 violations on record, including 17 health-based violations. 8 remain unresolved.
What to know about Vienna's water
Vienna ranks #634 out of 891 cities in Illinois 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 7 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Vienna, IL water safe to drink?
Vienna's drinking water has significant quality concerns based on EPA testing data. With a grade of B (77.3/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 3,736 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Vienna
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Vienna's water quality assessment. Grade: B (77.3/100).
Contaminants: Lead and Copper Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Total Haloacetic Acids (HAA5).
Federal disaster declaration (FEMA DR-3230). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-373). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Vienna's water supply.
Well within EPA limits.
Violation history
Vienna's water system has 163 total violations on record, including 17 health-based violations. 8 remain unresolved. 7 violations were issued in the last 5 years.
Flood & environmental risk
Johnson County has experienced 2 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 Cache River.
Where does Vienna's water come from?
Vienna's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 3 water systems serving approximately 3,736 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Cache River (river).
What Vienna residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Vienna'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.
Data: EPA SDWIS, UCMR 5 (PFAS), FEMA, NOAA. Last updated May 2026.
Top contaminants to know
View all ↓Violation summary
Violations & advisories
Drought conditions
D1 — moderate droughtJohnson County is currently in D1 (moderate drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Johnson County has experienced 2 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 Vienna compares by contaminant
Explore where Vienna ranks among all Illinois cities for specific contaminants.
Water source & infrastructure
Where Vienna's water comes from
Vienna'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 3,736 people through 3 water systems.
Water bodies near Vienna
Vienna 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 Vienna
| System Name | PWSID | Population | Source |
|---|---|---|---|
| VIENNA | IL0870350 | 1,618 | SW |
| SHAWNEE CORRECTIONAL CENTER | IL0870010 | 1,617 | SWP |
| VIENNA CORRECTIONAL CENTER | IL0875510 | 501 | SW |
How Vienna compares
Full Illinois rankings →Vienna's score of 77.3/100 is above the average of 56/100 among major Illinois cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Illinois rankings →About Vienna, IL
Learn more about your water
Guides and resources related to Vienna's water quality findings.
Explore water quality across Johnson
Frequently asked questions
Is Vienna, IL tap water safe to drink?
Vienna's water quality earned a grade of B (77.3/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #634 out of 891 cities tested in Illinois.
What contaminants are in Vienna's water?
Lead was measured at 0.0 ppb (90th percentile). 163 violations are on record.
How is Vienna'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 Vienna?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Vienna's water come from?
Vienna's water is sourced from Surface water. The city has 3 water systems serving approximately 3,736 residents.
What health violations has Vienna's water system had?
Vienna has 17 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. 8 violations remain unresolved.
How does Vienna's water compare to other cities?
Vienna ranks #634 out of 891 cities in Illinois (better than 29% of state cities) and #9032 out of 15744 cities nationally (43th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.