Is Sullivan, WI Tap Water Safe to Drink?
Graded A, with 1 unresolved violation on record. See what was cited — and what it means for your tap. What to do next ↓
91.6/100
waterverge.com Sullivan, WI — Water Quality Report
Sullivan's drinking water received a grade of A (91.6 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 525 residents using groundwater.
Lead levels were measured at 0.5 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 0 health-based violations. 1 remains unresolved.
What to know about Sullivan's water
Sullivan ranks #47 out of 446 cities in Wisconsin for water quality, placing it above average in the state.
Sullivan 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, Sullivan may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Sullivan, WI water safe to drink?
Sullivan's tap water meets most EPA standards but has areas that warrant attention. With a grade of A (91.6/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 525 residents using groundwater (wells).
Recent water quality updates for Sullivan
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Sullivan's water quality assessment. Grade: A (91.6/100).
Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Sullivan's water supply.
Well within EPA limits.
Violation history
Sullivan's water system has 3 total violations on record, including 0 health-based violations. 1 remain unresolved.
Where does Sullivan's water come from?
Sullivan's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 525 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Sullivan 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.
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 Sullivan
Industrial polluters nearby
Reported releases to surface water by facilities near Sullivan, ranked by pounds discharged annually.
Total reported releases to surface water: 43 lbs
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
WHITEWATER GENERATING STATION WHITEWATER, WI53190 | Ammonia | 43 | 9.2 mi |
MASTERMOLD LLC JOHNSON CREEK, WI53038 | — | — | 9.8 mi |
PREMOLD CORP OCONOMOWOC, WI53066 | — | — | 8.4 mi |
VORTEQ COIL FINISHERS OCONOMOWOC, WI53066 | — | — | 8.6 mi |
ACE PRECISION OCONOMOWOC, WI53066 | — | — | 7.0 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
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. | 0.5 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Sullivan compares by contaminant
Explore where Sullivan ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Sullivan's water comes from
Sullivan'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 private ownership and serves approximately 525 people through 1 water system.
Water systems serving Sullivan
| System Name | PWSID | Population | Source |
|---|---|---|---|
| SPACIOUS ACRES MOBILE HOME COMMUNITY | WI1280114 | 525 | GW |
How Sullivan compares
Full Wisconsin rankings →Sullivan's score of 91.6/100 is above the average of 65/100 among major Wisconsin cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Sullivan, WI
Learn more about your water
Guides and resources related to Sullivan's water quality findings.
Explore water quality across Jefferson
Frequently asked questions
Is Sullivan, WI tap water safe to drink?
Sullivan's water quality earned a grade of A (91.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #47 out of 446 cities tested in Wisconsin.
What contaminants are in Sullivan's water?
Lead was measured at 0.5 ppb (90th percentile). 3 violations are on record.
How is Sullivan'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 Sullivan?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Sullivan's water come from?
Sullivan's water is sourced from Groundwater. The city has 1 water system serving approximately 525 residents.
Is Sullivan's groundwater at risk of contamination?
Sullivan 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 Sullivan's water compare to other cities?
Sullivan ranks #47 out of 446 cities in Wisconsin (better than 89% of state cities) and #1622 out of 15744 cities nationally (90th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Sullivan's small water system affect quality?
Sullivan's system serves approximately 525 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.