Is Hazel Green, WI Tap Water Safe to Drink?
Graded F — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
44/100
waterverge.com Hazel Green, WI — Water Quality Report
Hazel Green's drinking water received a grade of F (44 out of 100), indicating failing water quality. The city's 3 water systems serve approximately 1,330 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 68 violations on record, including 14 health-based violations. 33 remain unresolved.
What to know about Hazel Green's water
Hazel Green ranks #430 out of 446 cities in Wisconsin for water quality, placing it among the lowest-rated in the state.
Hazel Green 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, Hazel Green may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 25 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Hazel Green, WI water safe to drink?
Hazel Green's drinking water has significant quality concerns based on EPA testing data. With a grade of F (44/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 3 water systems serve approximately 1,330 residents using groundwater (wells).
Recent water quality updates for Hazel Green
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Hazel Green's water quality assessment. Grade: F (44/100).
1 health-based. Contaminants: Stage 1 Disinfectants and Disinfection Byproducts Rule.
Contaminants: LEAD AND COPPER RULE REVISIONS.
1 health-based. Contaminants: Public Notice, LEAD AND COPPER RULE REVISIONS.
Federal disaster declaration (FEMA DR-3249). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-1369). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Hazel Green'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
Hazel Green's water system has 68 total violations on record, including 14 health-based violations. 33 remain unresolved. 25 violations were issued in the last 5 years.
Flood & environmental risk
Grant County has experienced 5 federally declared disasters since 1969. 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 Sinsinawa River.
Where does Hazel Green's water come from?
Hazel Green's drinking water comes from groundwater (wells), supplied by 3 water systems serving approximately 1,330 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Sinsinawa River (river).
What Hazel Green residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Hazel Green'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.
Hazel Green'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 Hazel Green
Industrial polluters nearby
Reported releases to surface water by facilities near Hazel Green, ranked by pounds discharged annually.
Total reported releases to surface water: 278,169 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
EAST DUBUQUE NITROGEN FERTILIZERS LLC EAST DUBUQUE, IL61025 | Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 278,169 | 8.1 mi |
SAFE FOOD CHEMICAL INNOVATIONS-KIELER KIELER, WI53812 | — | — | 9.4 mi |
TESSENDERLO KERLEY INC. - E. DUBUQUE EAST DUBUQUE, IL61025 | — | — | 8.1 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Grant County has experienced 5 federally declared disasters since 1969. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Hazel Green'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. | 0.0 | 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. | 1.39 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level trend (90th percentile)
See how Hazel Green compares by contaminant
Explore where Hazel Green ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Hazel Green's water comes from
Hazel Green'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 1,330 people through 3 water systems.
Water bodies near Hazel Green
Hazel Green is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Hazel Green
| System Name | PWSID | Population | Source |
|---|---|---|---|
| HAZEL GREEN WATERWORKS | WI1220102 | 1,193 | GW |
| MARYVILLE SD 2 | WI1220105 | 100 | GW |
| STATELINE MOBILE HOME PARK | WI1220100 | 37 | GW |
How Hazel Green compares
Full Wisconsin rankings →Hazel Green's score of 44/100 is below the average of 65/100 among major Wisconsin cities. It outscores 1 of 10 nearby cities. 9 of 10 nearby cities score higher.
Nearby cities
View Wisconsin rankings →About Hazel Green, WI
Learn more about your water
Guides and resources related to Hazel Green's water quality findings.
Explore water quality across Grant
Frequently asked questions
Is Hazel Green, WI tap water safe to drink?
Hazel Green's water quality earned a grade of F (44/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #430 out of 446 cities tested in Wisconsin.
What contaminants are in Hazel Green's water?
Lead was measured at 0.0 ppb (90th percentile). 68 violations are on record.
How is Hazel Green'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 Hazel Green?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Hazel Green's water come from?
Hazel Green's water is sourced from Groundwater. The city has 3 water systems serving approximately 1,330 residents.
What health violations has Hazel Green's water system had?
Hazel Green has 14 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. 33 violations remain unresolved.
Is Hazel Green's groundwater at risk of contamination?
Hazel Green 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 68 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 Hazel Green's water compare to other cities?
Hazel Green ranks #430 out of 446 cities in Wisconsin (better than 4% of state cities) and #14486 out of 15744 cities nationally (8th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.