Is Evansville, WY Tap Water Safe to Drink?
Graded B+, with 6 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
83.5/100
waterverge.com Evansville, WY — Water Quality Report
Evansville's drinking water received a grade of B+ (83.5 out of 100), indicating good water quality. The city's 2 water systems serve approximately 2,853 residents using surface water.
Lead levels were measured at 1.0 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 24 violations on record, including 1 health-based violation. 6 remain unresolved.
What to know about Evansville's water
Evansville ranks #22 out of 65 cities in Wyoming for water quality, placing it mid-range 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, Evansville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 6 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Evansville, WY water safe to drink?
Evansville's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (83.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 2,853 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Evansville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Evansville's water quality assessment. Grade: B+ (83.5/100).
Contaminants: Lead and Copper Rule.
Contaminants: Consumer Confidence Rule.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-4739). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-557). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Evansville's water supply.
Well within EPA limits.
Violation history
Evansville's water system has 24 total violations on record, including 1 health-based violation. 6 remain unresolved. 6 violations were issued in the last 5 years.
Flood & environmental risk
Natrona County has experienced 2 federally declared disasters since 1978. 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 Evansville's water come from?
Evansville's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 2 water systems serving approximately 2,853 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment.
What Evansville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Evansville'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
Top industrial polluters within 10 miles of Evansville
Industrial polluters nearby
Reported releases to surface water by facilities near Evansville, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
KNIFE RIVER CASPER CASPER, WY82601 | — | — | 1.6 mi |
CUSTOM FIBERGLASS INC CASPER, WY82604 | — | — | 8.0 mi |
HF SINCLAIR CASPER REFINING LLC CASPER, WY82609 | — | — | 1.8 mi |
KNIFE RIVER MATERIALS YARD CASPER, WY82604 | — | — | 6.7 mi |
TALLGRASS MIDSTREAM LLC - CASPER GAS PLANT & COMPRESSOR STAT CASPER, WY82609 | — | — | 1.8 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D3 — extreme droughtNatrona County is currently in D3 (extreme 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
Natrona County has experienced 2 federally declared disasters since 1978. 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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Evansville compares by contaminant
Explore where Evansville ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Evansville's water comes from
Evansville'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 2,853 people through 2 water systems.
Water systems serving Evansville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| EVANSVILLE, TOWN OF | WY5600018 | 2,728 | SW |
| SOUTH RIVERSIDE ACRES WTR IMPR DIST | WY5601072 | 125 | GW |
How Evansville compares
Full Wyoming rankings →Evansville's score of 83.5/100 is above the average of 55/100 among major Wyoming cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Wyoming rankings →About Evansville, WY
Learn more about your water
Guides and resources related to Evansville's water quality findings.
Explore water quality across Natrona
Frequently asked questions
Is Evansville, WY tap water safe to drink?
Evansville's water quality earned a grade of B+ (83.5/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #22 out of 65 cities tested in Wyoming.
What contaminants are in Evansville's water?
Lead was measured at 1.0 ppb (90th percentile). 24 violations are on record.
How is Evansville'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 Evansville?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Evansville's water come from?
Evansville's water is sourced from Surface water. The city has 2 water systems serving approximately 2,853 residents.
What health violations has Evansville's water system had?
Evansville has 1 health-based violation on record. The most recent violation was recorded in December 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 6 violations remain unresolved.
How does Evansville's water compare to other cities?
Evansville ranks #22 out of 65 cities in Wyoming (better than 66% of state cities) and #6397 out of 15744 cities nationally (59th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.