Is Spring Green, WI Tap Water Safe to Drink?
Graded C — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
61.5/100
waterverge.com Spring Green, WI — Water Quality Report
Spring Green's drinking water received a grade of C (61.5 out of 100), indicating fair water quality. The city's 5 water systems serve approximately 2,468 residents using groundwater.
Lead levels were measured at 0.7 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 85 violations on record, including 14 health-based violations. 25 remain unresolved.
What to know about Spring Green's water
Spring Green ranks #382 out of 446 cities in Wisconsin for water quality, placing it among the lowest-rated in the state.
Spring 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, Spring Green may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 9 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Spring Green, WI water safe to drink?
Spring Green's drinking water has significant quality concerns based on EPA testing data. With a grade of C (61.5/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 5 water systems serve approximately 2,468 residents using groundwater (wells).
Recent water quality updates for Spring Green
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Spring Green's water quality assessment. Grade: C (61.5/100).
1 health-based. Contaminants: Groundwater Rule.
Contaminants: Radium-228, Combined Radium (-226 and -228).
Contaminants: Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-4402). 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 Spring 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
Spring Green's water system has 85 total violations on record, including 14 health-based violations. 25 remain unresolved. 9 violations were issued in the last 5 years.
Flood & environmental risk
Sauk County has experienced 4 federally declared disasters since 1976. 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 Spring Green's water come from?
Spring Green's drinking water comes from groundwater (wells), supplied by 5 water systems serving approximately 2,468 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Spring Green residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Spring 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.
Spring 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 Spring Green
Industrial polluters nearby
Reported releases to surface water by facilities near Spring Green, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CARDINAL ROTAR SPRING GREEN, WI53588 | — | — | 0.7 mi |
CARDINAL GLASS SPRING GREEN, WI53588 | — | — | 0.6 mi |
CARDINAL CG SPRING GREEN, WI53588 | — | — | 0.6 mi |
CARDINAL GLASS SPRING GREEN, WI53588 | — | — | 0.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Sauk County has experienced 4 federally declared disasters since 1976. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Spring 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. | 0.7 | 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. | 12.82 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 12.825 mg/L (1994)
EPA action level: 1.3 mg/L
See how Spring Green compares by contaminant
Explore where Spring Green ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Spring Green's water comes from
Spring 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 2,468 people through 5 water systems.
Water systems serving Spring Green
| System Name | PWSID | Population | Source |
|---|---|---|---|
| SPRING GREEN WATERWORKS | WI1570109 | 1,626 | GW |
| HOUSE ON THE ROCK RESORT | WI1250318 | 470 | GW |
| SPRING GREEN ESTATES | WI1570110 | 300 | GW |
| SPRING GREEN ESTATES SOUTH | WI1571282 | 40 | GW |
| SPRING GREEN ESTATES NORTH | WI1571284 | 32 | GW |
How Spring Green compares
Full Wisconsin rankings →Spring Green's score of 61.5/100 is on par with the average of 65/100 among major Wisconsin cities. It outscores 5 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Spring Green, WI
Wikipedia →Spring Green is a village in Sauk County, Wisconsin, United States. The population was 1,566 at the 2020 census. The village is located within the Town of Spring Green. It is perhaps best known for the architect Frank Lloyd Wright's estate Taliesin and related tourism.
Learn more about your water
Guides and resources related to Spring Green's water quality findings.
Explore water quality across Sauk
Frequently asked questions
Is Spring Green, WI tap water safe to drink?
Spring Green's water quality earned a grade of C (61.5/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #382 out of 446 cities tested in Wisconsin.
What contaminants are in Spring Green's water?
Lead was measured at 0.7 ppb (90th percentile). 85 violations are on record.
How is Spring 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 Spring Green?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Spring Green's water come from?
Spring Green's water is sourced from Groundwater. The city has 5 water systems serving approximately 2,468 residents.
What health violations has Spring Green's water system had?
Spring Green has 14 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 25 violations remain unresolved.
Is Spring Green's groundwater at risk of contamination?
Spring 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 85 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 Spring Green's water compare to other cities?
Spring Green ranks #382 out of 446 cities in Wisconsin (better than 14% of state cities) and #11980 out of 15744 cities nationally (24th percentile). The grade of C reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.