Is Cashton, WI Tap Water Safe to Drink?
Graded A, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
91.6/100
waterverge.com Cashton, WI — Water Quality Report
Cashton'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 1,120 residents using groundwater.
Lead levels were measured at 4.5 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 10 violations on record, including 6 health-based violations. 2 remain unresolved.
What to know about Cashton's water
Cashton ranks #46 out of 446 cities in Wisconsin for water quality, placing it above average in the state.
Cashton 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, Cashton may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Cashton, WI water safe to drink?
Cashton'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 1,120 residents using groundwater (wells).
Recent water quality updates for Cashton
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Cashton's water quality assessment. Grade: A (91.6/100).
Federal disaster declaration (FEMA DR-4459). Flood event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-4402). Flood event — may have impacted local water infrastructure.
Contaminants: Consumer Confidence Rule.
1 health-based. Contaminants: Coliform (TCR).
1 health-based. Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Cashton's water supply.
Well within EPA limits.
Violation history
Cashton's water system has 10 total violations on record, including 6 health-based violations. 2 remain unresolved.
Flood & environmental risk
Monroe County has experienced 5 federally declared disasters since 1990. 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 Cashton's water come from?
Cashton's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,120 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Cashton 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.
Cashton'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
Monroe County has experienced 5 federally declared disasters since 1990. 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. | 4.5 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Cashton compares by contaminant
Explore where Cashton ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Cashton's water comes from
Cashton'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 1,120 people through 1 water system.
Water systems serving Cashton
| System Name | PWSID | Population | Source |
|---|---|---|---|
| CASHTON WATERWORKS | WI6420294 | 1,120 | GW |
How Cashton compares
Full Wisconsin rankings →Cashton'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 Cashton, WI
Learn more about your water
Guides and resources related to Cashton's water quality findings.
Explore water quality across Monroe
Frequently asked questions
Is Cashton, WI tap water safe to drink?
Cashton'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 #46 out of 446 cities tested in Wisconsin.
What contaminants are in Cashton's water?
Lead was measured at 4.5 ppb (90th percentile). 10 violations are on record.
How is Cashton'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 Cashton?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Cashton's water come from?
Cashton's water is sourced from Groundwater. The city has 1 water system serving approximately 1,120 residents.
What health violations has Cashton's water system had?
Cashton has 6 health-based violations on record. The most recent violation was recorded in July 2004. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Cashton's groundwater at risk of contamination?
Cashton 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 10 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 Cashton's water compare to other cities?
Cashton ranks #46 out of 446 cities in Wisconsin (better than 90% of state cities) and #1604 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 Cashton's small water system affect quality?
Cashton's system serves approximately 1,120 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 10 violations on record.