Is Walworth, WI Tap Water Safe to Drink?
Graded B-, with 20 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
72.4/100
waterverge.com Walworth, WI — Water Quality Report
Walworth's drinking water received a grade of B- (72.4 out of 100), indicating fair water quality. The city's 3 water systems serve approximately 2,474 residents using groundwater.
Lead levels were measured at 6.3 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 62 violations on record, including 8 health-based violations. 20 remain unresolved.
What to know about Walworth's water
Walworth ranks #338 out of 446 cities in Wisconsin for water quality, placing it among the lowest-rated in the state.
Walworth 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.
While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection.
As a small community water system, Walworth may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 10 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Walworth, WI water safe to drink?
Walworth's drinking water has significant quality concerns based on EPA testing data. With a grade of B- (72.4/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 2,474 residents using groundwater (wells).
Recent water quality updates for Walworth
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Walworth's water quality assessment. Grade: B- (72.4/100).
Contaminants: Lead and Copper Rule.
Contaminants: Revised Total Coliform Rule, Chlorine, Consumer Confidence Rule.
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3249). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-496). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Walworth's water supply.
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb. An NSF 53-certified filter provides additional protection.
Violation history
Walworth's water system has 62 total violations on record, including 8 health-based violations. 20 remain unresolved. 10 violations were issued in the last 5 years.
Flood & environmental risk
Walworth County has experienced 3 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 Jackson Creek, Delavan Lake Inlet, Delavan Lake Outlet, Piscasaw Creek.
Where does Walworth's water come from?
Walworth's drinking water comes from groundwater (wells), supplied by 3 water systems serving approximately 2,474 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Jackson Creek (river), Delavan Lake Inlet (river), Delavan Lake Outlet (river), Piscasaw Creek (river).
What Walworth residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Walworth'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
Walworth'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 Walworth
Industrial polluters nearby
Reported releases to surface water by facilities near Walworth, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CONAGRA FOODS PACKAGED FOODS LLC DARIEN, WI53114 | — | — | 8.2 mi |
USG STRUCTURAL TECHNOLOGIES LLC DELAVAN, WI53115 | — | — | 7.5 mi |
PENTAIR FLOW TECHNOLOGIES DELAVAN, WI53115 | — | — | 7.3 mi |
SPX FLOW US LLC DELAVAN, WI53115 | — | — | 7.8 mi |
SPX FLOW US LLC DELAVAN, WI53115 | — | — | 7.3 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Superfund sites within 10 miles of Walworth
Superfund sites nearby
Federally tracked hazardous-waste sites on the EPA National Priorities List. Proximity does not necessarily indicate tap-water contamination — the connection depends on hydrology and treatment.
- DELAVAN MUNICIPAL WELL 47.2 mi
Source: EPA Superfund National Priorities List
Flood & disaster history
Walworth County has experienced 3 federally declared disasters since 1973. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Walworth'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. | 6.3 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Walworth compares by contaminant
Explore where Walworth ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Walworth's water comes from
Walworth'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 2,474 people through 3 water systems.
Water bodies near Walworth
Walworth is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Walworth
| System Name | PWSID | Population | Source |
|---|---|---|---|
| WALWORTH WATERWORKS | WI2650149 | 2,304 | GW |
| CAPRON MHP | IL0075105 | 90 | GW |
| INSPIRATION MINISTRIES & MEADOWS APTS | WI2650148 | 80 | GW |
How Walworth compares
Full Wisconsin rankings →Walworth's score of 72.4/100 is above the average of 65/100 among major Wisconsin cities. It outscores 6 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Walworth, WI
Learn more about your water
Guides and resources related to Walworth's water quality findings.
Explore water quality across Walworth
Frequently asked questions
Is Walworth, WI tap water safe to drink?
Walworth's water quality earned a grade of B- (72.4/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #338 out of 446 cities tested in Wisconsin.
What contaminants are in Walworth's water?
Lead was measured at 6.3 ppb (90th percentile). 62 violations are on record.
How is Walworth'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 Walworth?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Walworth's water come from?
Walworth's water is sourced from Groundwater. The city has 3 water systems serving approximately 2,474 residents.
What health violations has Walworth's water system had?
Walworth has 8 health-based violations on record. The most recent violation was recorded in October 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 20 violations remain unresolved.
Is Walworth's groundwater at risk of contamination?
Walworth 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 62 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 Walworth's water compare to other cities?
Walworth ranks #338 out of 446 cities in Wisconsin (better than 24% of state cities) and #10319 out of 15744 cities nationally (35th percentile). The grade of B- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.