Is Williamsport, IN Tap Water Safe to Drink?
Graded C-, with 18 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
59.8/100
waterverge.com Williamsport, IN — Water Quality Report
Williamsport's drinking water received a grade of C- (59.8 out of 100), indicating poor water quality. The city's 2 water systems serve approximately 1,837 residents using groundwater.
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 101 violations on record, including 3 health-based violations. 18 remain unresolved.
What to know about Williamsport's water
Williamsport ranks #365 out of 414 cities in Indiana for water quality, placing it among the lowest-rated in the state.
Williamsport 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, Williamsport may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 24 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Williamsport, IN water safe to drink?
Williamsport's drinking water has significant quality concerns based on EPA testing data. With a grade of C- (59.8/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 1,837 residents using groundwater (wells).
Recent water quality updates for Williamsport
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Williamsport's water quality assessment. Grade: C- (59.8/100).
Contaminants: Consumer Confidence Rule, Lead and Copper Rule.
1 health-based. Contaminants: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Federal disaster declaration (FEMA DR-4882). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4363). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Williamsport's water supply.
Well within EPA limits.
Violation history
Williamsport's water system has 101 total violations on record, including 3 health-based violations. 18 remain unresolved. 24 violations were issued in the last 5 years.
Flood & environmental risk
Warren County has experienced 4 federally declared disasters since 1991. 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 Wabash River, Redwood Creek.
Where does Williamsport's water come from?
Williamsport's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 1,837 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Wabash River (river), Redwood Creek (river).
What Williamsport residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Williamsport'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.
Williamsport'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 Williamsport
Industrial polluters nearby
Reported releases to surface water by facilities near Williamsport, ranked by pounds discharged annually.
Total reported releases to surface water: 42 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
HARRISON STEEL CASTINGS CO ATTICA, IN47918 | Manganese | 41 | 2.0 mi |
C&D TECHNOLOGIES INC ATTICA, IN47918 | Lead And Lead Compounds | 0 | 2.2 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Warren County has experienced 4 federally declared disasters since 1991. 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 Williamsport compares by contaminant
Explore where Williamsport ranks among all Indiana cities for specific contaminants.
Water source & infrastructure
Where Williamsport's water comes from
Williamsport'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 local government ownership and serves approximately 1,837 people through 2 water systems.
Water bodies near Williamsport
Williamsport is located near 2 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Williamsport
| System Name | PWSID | Population | Source |
|---|---|---|---|
| WILLIAMSPORT WATER UTILITY | IN5286004 | 1,800 | GW |
| PENCE WATER WORKS | IN5286002 | 37 | GW |
How Williamsport compares
Full Indiana rankings →Williamsport's score of 59.8/100 is below the average of 70/100 among major Indiana cities. It outscores 3 of 10 nearby cities. 7 of 10 nearby cities score higher.
Nearby cities
View Indiana rankings →About Williamsport, IN
Learn more about your water
Guides and resources related to Williamsport's water quality findings.
Explore water quality across Warren
Frequently asked questions
Is Williamsport, IN tap water safe to drink?
Williamsport's water quality earned a grade of C- (59.8/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #365 out of 414 cities tested in Indiana.
What contaminants are in Williamsport's water?
Lead was measured at 0.0 ppb (90th percentile). 101 violations are on record.
How is Williamsport'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 Williamsport?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Williamsport's water come from?
Williamsport's water is sourced from Groundwater. The city has 2 water systems serving approximately 1,837 residents.
What health violations has Williamsport's water system had?
Williamsport has 3 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 18 violations remain unresolved.
Is Williamsport's groundwater at risk of contamination?
Williamsport 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 101 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 Williamsport's water compare to other cities?
Williamsport ranks #365 out of 414 cities in Indiana (better than 12% of state cities) and #12143 out of 15744 cities nationally (23th percentile). The grade of C- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.