Is St Croix Falls, WI Tap Water Safe to Drink?
Graded B+, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
83.2/100
waterverge.com St Croix Falls, WI — Water Quality Report
St Croix Falls's drinking water received a grade of B+ (83.2 out of 100), indicating good water quality. The city's 1 water system serves approximately 2,079 residents using groundwater.
Lead levels were measured at 4.7 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 3 violations on record, including 1 health-based violation. 2 remain unresolved.
What to know about St Croix Falls's water
St Croix Falls ranks #198 out of 446 cities in Wisconsin for water quality, placing it mid-range in the state.
St Croix Falls 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, St Croix Falls may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is St Croix Falls, WI water safe to drink?
St Croix Falls's tap water meets most EPA standards but has areas that warrant attention. With a grade of B+ (83.2/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 2,079 residents using groundwater (wells).
Recent water quality updates for St Croix Falls
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into St Croix Falls's water quality assessment. Grade: B+ (83.2/100).
Contaminants: Lead and Copper Rule.
Federal disaster declaration (FEMA DR-4459). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-3249). Hurricane event — may have impacted local water infrastructure.
1 health-based. Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for St Croix Falls's water supply.
Well within EPA limits.
Violation history
St Croix Falls's water system has 3 total violations on record, including 1 health-based violation. 2 remain unresolved. 1 violation was issued in the last 5 years.
Flood & environmental risk
Polk 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. Local water sources include St. Croix River.
Where does St Croix Falls's water come from?
St Croix Falls's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 2,079 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include St. Croix River (river).
What St Croix Falls residents can do
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.
St Croix Falls'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
Flood & disaster history
Polk 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. | 4.7 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how St Croix Falls compares by contaminant
Explore where St Croix Falls ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where St Croix Falls's water comes from
St Croix Falls'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 2,079 people through 1 water system.
Water bodies near St Croix Falls
St Croix Falls is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving St Croix Falls
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ST CROIX FALLS WATERWORKS | WI6490343 | 2,079 | GW |
How St Croix Falls compares
Full Wisconsin rankings →St Croix Falls's score of 83.2/100 is above the average of 65/100 among major Wisconsin cities. It outscores 8 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About St Croix Falls, WI
Learn more about your water
Guides and resources related to St Croix Falls's water quality findings.
Explore water quality across Polk
Frequently asked questions
Is St Croix Falls, WI tap water safe to drink?
St Croix Falls's water quality earned a grade of B+ (83.2/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #198 out of 446 cities tested in Wisconsin.
What contaminants are in St Croix Falls's water?
Lead was measured at 4.7 ppb (90th percentile). 3 violations are on record.
How is St Croix Falls'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 St Croix Falls?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does St Croix Falls's water come from?
St Croix Falls's water is sourced from Groundwater. The city has 1 water system serving approximately 2,079 residents.
What health violations has St Croix Falls's water system had?
St Croix Falls has 1 health-based violation on record. The most recent violation was recorded in January 2024. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is St Croix Falls's groundwater at risk of contamination?
St Croix Falls 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 3 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 St Croix Falls's water compare to other cities?
St Croix Falls ranks #198 out of 446 cities in Wisconsin (better than 56% of state cities) and #6552 out of 15744 cities nationally (58th percentile). The grade of B+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does St Croix Falls's small water system affect quality?
St Croix Falls's system serves approximately 2,079 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 3 violations on record.