Is Leo, IN 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 ↓
83.3/100
waterverge.com Leo, IN — Water Quality Report
Leo's drinking water received a grade of B+ (83.3 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,076 residents using groundwater.
Lead levels were measured at 1.6 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 45 violations on record, including 0 health-based violations. 11 remain unresolved.
What to know about Leo's water
Leo ranks #191 out of 414 cities in Indiana for water quality, placing it mid-range in the state.
Leo relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff.
As a small community water system, Leo may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Leo, IN water safe to drink?
Leo's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (83.3/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 2,076 residents using groundwater (wells).
Recent water quality updates for Leo
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Leo's water quality assessment. Grade: B+ (83.3/100).
Contaminants: Consumer Confidence Rule.
Contaminants: Lead and Copper Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3238). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-891). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Leo's water supply.
Well within EPA limits.
Violation history
Leo's water system has 45 total violations on record, including 0 health-based violations. 11 remain unresolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
DeKalb County has experienced 3 federally declared disasters since 1982. 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 St Joseph River Near Newville, Cedar Creek, Black Creek.
Where does Leo's water come from?
Leo's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,076 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include St Joseph River Near Newville (river), Cedar Creek (river), Black Creek (river).
What Leo residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Leo'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.
Leo'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
DeKalb County has experienced 3 federally declared disasters since 1982. 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. | 1.6 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Leo compares by contaminant
Explore where Leo ranks among all Indiana cities for specific contaminants.
Water source & infrastructure
Where Leo's water comes from
Leo's drinking water is drawn from underground aquifers through wells.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals.
Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds.
The system is operated by private ownership and serves approximately 2,076 people through 1 water system.
Water bodies near Leo
Leo is located near 3 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Leo
| System Name | PWSID | Population | Source |
|---|---|---|---|
| PIONEER WATER L.L.C. | IN5202034 | 2,076 | GW |
How Leo compares
Full Indiana rankings →Leo's score of 83.3/100 is above the average of 70/100 among major Indiana cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Indiana rankings →About Leo, IN
Learn more about your water
Guides and resources related to Leo's water quality findings.
Explore water quality across Allen
Frequently asked questions
Is Leo, IN tap water safe to drink?
Leo's water quality earned a grade of B+ (83.3/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #191 out of 414 cities tested in Indiana.
What contaminants are in Leo's water?
Lead was measured at 1.6 ppb (90th percentile). 45 violations are on record.
How is Leo'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 Leo?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Leo's water come from?
Leo's water is sourced from Groundwater. The city has 1 water system serving approximately 2,076 residents.
Is Leo's groundwater at risk of contamination?
Leo uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 45 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Leo's water compare to other cities?
Leo ranks #191 out of 414 cities in Indiana (better than 54% of state cities) and #6492 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.
Does Leo's small water system affect quality?
Leo's system serves approximately 2,076 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 45 violations on record.