Is Allenton, WI Tap Water Safe to Drink?
Graded A, with 5 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
90.6/100
waterverge.com Allenton, WI — Water Quality Report
Allenton's drinking water received a grade of A (90.6 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 860 residents using groundwater.
Lead levels were measured at 1.0 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 15 violations on record, including 2 health-based violations. 5 remain unresolved.
What to know about Allenton's water
Allenton ranks #71 out of 446 cities in Wisconsin for water quality, placing it above average in the state.
Allenton 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, Allenton may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Allenton, WI water safe to drink?
Allenton's drinking water has significant quality concerns based on EPA testing data. With a grade of A (90.6/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 860 residents using groundwater (wells).
Recent water quality updates for Allenton
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Allenton's water quality assessment. Grade: A (90.6/100).
Federal disaster declaration (FEMA DR-4892). Flood event — may have impacted local water infrastructure.
Contaminants: Gross Alpha, Excl. Radon and U, Radium-228, Combined Radium (-226 and -228).
Federal disaster declaration (FEMA DR-3249). Hurricane event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
Contaminants: Public Notice.
Key contaminant findings
Based on the most recent EPA sampling data for Allenton's water supply.
Well within EPA limits.
Violation history
Allenton's water system has 15 total violations on record, including 2 health-based violations. 5 remain unresolved.
Flood & environmental risk
Washington 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 Allenton's water come from?
Allenton's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 860 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Allenton residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Allenton'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.
Allenton'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 Allenton
Industrial polluters nearby
Reported releases to surface water by facilities near Allenton, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
MAYSTEEL LLC ALLENTON, WI53002 | — | — | 0.5 mi |
BOYD CORP ALLENTON, WI53002 | — | — | 0.6 mi |
BROAN-NUTONE LLC HARTFORD, WI53027 | — | — | 6.9 mi |
QUAD/GRAPHICS INC HARTFORD, WI53027 | — | — | 7.5 mi |
SIGNICAST LLC HARTFORD MANUFACTURING COMPLEX HARTFORD, WI53027 | — | — | 6.7 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Flood & disaster history
Washington 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.
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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Allenton compares by contaminant
Explore where Allenton ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Allenton's water comes from
Allenton'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 860 people through 1 water system.
Water systems serving Allenton
| System Name | PWSID | Population | Source |
|---|---|---|---|
| ALLENTON SANITARY DISTRICT | WI2670104 | 860 | GW |
How Allenton compares
Full Wisconsin rankings →Allenton's score of 90.6/100 is above the average of 65/100 among major Wisconsin cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Allenton, WI
Wikipedia →Allenton is an unincorporated census-designated place in the town of Addison in Washington County, Wisconsin, United States. It is located near the intersection of Wisconsin Highway 33 and Interstate 41. It is on a line of the Canadian National Railway, parent company of the Wisconsin Central Ltd. railroad company. Allenton has a post office with ZIP code 53002. As of the 2020 census, its population was 859.
Learn more about your water
Guides and resources related to Allenton's water quality findings.
Explore water quality across Washington
Frequently asked questions
Is Allenton, WI tap water safe to drink?
Allenton's water quality earned a grade of A (90.6/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #71 out of 446 cities tested in Wisconsin.
What contaminants are in Allenton's water?
Lead was measured at 1.0 ppb (90th percentile). 15 violations are on record.
How is Allenton'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 Allenton?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Allenton's water come from?
Allenton's water is sourced from Groundwater. The city has 1 water system serving approximately 860 residents.
What health violations has Allenton's water system had?
Allenton has 2 health-based violations on record. The most recent violation was recorded in January 2011. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 5 violations remain unresolved.
Is Allenton's groundwater at risk of contamination?
Allenton 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 15 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 Allenton's water compare to other cities?
Allenton ranks #71 out of 446 cities in Wisconsin (better than 84% of state cities) and #2142 out of 15744 cities nationally (86th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Allenton's small water system affect quality?
Allenton's system serves approximately 860 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 15 violations on record.