Is Grantsburg, WI Tap Water Safe to Drink?
Graded B+, with 8 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
81.1/100
waterverge.com Grantsburg, WI — Water Quality Report
Grantsburg's drinking water received a grade of B+ (81.1 out of 100), indicating good water quality. The city's 2 water systems serve approximately 1,575 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 9 violations on record, including 0 health-based violations. 8 remain unresolved.
What to know about Grantsburg's water
Grantsburg ranks #243 out of 446 cities in Wisconsin for water quality, placing it below average in the state.
Grantsburg 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, Grantsburg may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Grantsburg, WI water safe to drink?
Grantsburg's drinking water has significant quality concerns based on EPA testing data. With a grade of B+ (81.1/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 1,575 residents using groundwater (wells).
Recent water quality updates for Grantsburg
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Grantsburg's water quality assessment. Grade: B+ (81.1/100).
Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: Public Notice.
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-4383). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3249). Hurricane event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Grantsburg's water supply.
Well within EPA limits.
Violation history
Grantsburg's water system has 9 total violations on record, including 0 health-based violations. 8 remain unresolved. 5 violations were issued in the last 5 years.
Flood & environmental risk
Burnett County has experienced 3 federally declared disasters since 2001. Flooding and severe storms can overwhelm water treatment plants, cause sewage overflows, and introduce agricultural runoff, bacteria, and sediment into drinking water supplies.
Where does Grantsburg's water come from?
Grantsburg's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 1,575 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Grantsburg residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Grantsburg'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.
Grantsburg'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 Grantsburg
Industrial polluters nearby
Reported releases to surface water by facilities near Grantsburg, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
BURNETT DAIRY COOPERATIVE CHEESE PLANT GRANTSBURG, WI54840 | — | — | 4.7 mi |
PARKER HANNIFIN CORP GRANTSBURG, WI54840 | — | — | 0.4 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Burnett County has experienced 3 federally declared disasters since 2001. 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 Grantsburg compares by contaminant
Explore where Grantsburg ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Grantsburg's water comes from
Grantsburg'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 1,575 people through 2 water systems.
Water systems serving Grantsburg
| System Name | PWSID | Population | Source |
|---|---|---|---|
| GRANTSBURG WATERWORKS | WI8070310 | 1,460 | GW |
| BISTRAM MOBILE HOME PARK | WI8070023 | 115 | GW |
How Grantsburg compares
Full Wisconsin rankings →Grantsburg's score of 81.1/100 is above the average of 65/100 among major Wisconsin cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Grantsburg, WI
Learn more about your water
Guides and resources related to Grantsburg's water quality findings.
Explore water quality across Burnett
Frequently asked questions
Is Grantsburg, WI tap water safe to drink?
Grantsburg's water quality earned a grade of B+ (81.1/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #243 out of 446 cities tested in Wisconsin.
What contaminants are in Grantsburg's water?
Lead was measured at 0.0 ppb (90th percentile). 9 violations are on record.
How is Grantsburg'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 Grantsburg?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Grantsburg's water come from?
Grantsburg's water is sourced from Groundwater. The city has 2 water systems serving approximately 1,575 residents.
Is Grantsburg's groundwater at risk of contamination?
Grantsburg 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 9 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 Grantsburg's water compare to other cities?
Grantsburg ranks #243 out of 446 cities in Wisconsin (better than 46% of state cities) and #7595 out of 15744 cities nationally (52th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.