Is Leon, KS Tap Water Safe to Drink?
Graded B — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
76.5/100
waterverge.com Leon, KS — Water Quality Report
Leon's drinking water received a grade of B (76.5 out of 100), indicating good water quality. The city's 1 water system serves approximately 667 residents using purchased surface water.
Lead levels were measured at 1.1 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 34 violations on record, including 1 health-based violation. 19 remain unresolved.
What to know about Leon's water
Leon ranks #202 out of 323 cities in Kansas 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, Leon may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Leon, KS water safe to drink?
Leon's drinking water has significant quality concerns based on EPA testing data. With a grade of B (76.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 667 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Leon
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Leon's water quality assessment. Grade: B (76.5/100).
Contaminants: Lead and Copper Rule.
Contaminants: Public Notice.
Contaminants: Revised Total Coliform Rule, Chloramine.
Federal disaster declaration (FEMA DR-3236). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-588). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Leon's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Leon's water system has 34 total violations on record, including 1 health-based violation. 19 remain unresolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
Butler County has experienced 5 federally declared disasters since 1965. 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 Wb Walnut R Nr El Dorado.
Where does Leon's water come from?
Leon's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 667 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Wb Walnut R Nr El Dorado (river).
What Leon residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Leon'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.
Leon'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 Leon
Industrial polluters nearby
Reported releases to surface water by facilities near Leon, ranked by pounds discharged annually.
Total reported releases to surface water: 1,019 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
HF SINCLAIR EL DORADO REFINING LLC EL DORADO, KS67042 | Ammonia | 1,019 | 8.9 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Butler County has experienced 5 federally declared disasters since 1965. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Leon's water supply, we recommend the following filter types.
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. | 1.1 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 1.50 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Leon compares by contaminant
Explore where Leon ranks among all Kansas cities for specific contaminants.
Water source & infrastructure
Where Leon's water comes from
Leon'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 667 people through 1 water system.
Water bodies near Leon
Leon 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 Leon
| System Name | PWSID | Population | Source |
|---|---|---|---|
| LEON, CITY OF | KS2001515 | 667 | SWP |
How Leon compares
Full Kansas rankings →Leon's score of 76.5/100 is above the average of 62/100 among major Kansas cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Kansas rankings →About Leon, KS
Wikipedia →Leon is a city in Butler County, Kansas, United States. As of the 2020 census, the population of the city was 669.
Learn more about your water
Guides and resources related to Leon's water quality findings.
Explore water quality across Butler
Frequently asked questions
Is Leon, KS tap water safe to drink?
Leon's water quality earned a grade of B (76.5/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #202 out of 323 cities tested in Kansas.
What contaminants are in Leon's water?
Lead was measured at 1.1 ppb (90th percentile). 34 violations are on record.
How is Leon'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 Leon?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Leon's water come from?
Leon's water is sourced from Purchased surface water. The city has 1 water system serving approximately 667 residents.
What health violations has Leon's water system had?
Leon has 1 health-based violation on record. The most recent violation was recorded in January 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 19 violations remain unresolved.
How does Leon's water compare to other cities?
Leon ranks #202 out of 323 cities in Kansas (better than 37% of state cities) and #9292 out of 15744 cities nationally (41th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Leon's small water system affect quality?
Leon's system serves approximately 667 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 34 violations on record.