Is Hammond, WI Tap Water Safe to Drink?
Graded A, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
90.7/100
waterverge.com Hammond, WI — Water Quality Report
Hammond's drinking water received a grade of A (90.7 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 1,884 residents using groundwater.
Lead levels were measured at 0.0 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 9 violations on record, including 5 health-based violations. 3 remain unresolved.
What to know about Hammond's water
Hammond ranks #65 out of 446 cities in Wisconsin for water quality, placing it above average in the state.
Hammond 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, Hammond may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Hammond, WI water safe to drink?
Hammond's drinking water has significant quality concerns based on EPA testing data. With a grade of A (90.7/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 1,884 residents using groundwater (wells).
Recent water quality updates for Hammond
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Hammond's water quality assessment. Grade: A (90.7/100).
1 health-based. Contaminants: Coliform (TCR).
1 health-based. Contaminants: Coliform (TCR), Consumer Confidence Rule.
1 health-based. Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Hammond's water supply.
Well within EPA limits.
Violation history
Hammond's water system has 9 total violations on record, including 5 health-based violations. 3 remain unresolved.
Where does Hammond's water come from?
Hammond's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 1,884 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Hammond residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Hammond'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.
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 Hammond
Industrial polluters nearby
Reported releases to surface water by facilities near Hammond, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
CRM - NEW RICHMOND NEW RICHMOND, WI54017 | — | — | 9.7 mi |
MCMILLAN ELECTRIC CO WOODVILLE, WI54028 | — | — | 7.5 mi |
ROBERTS CONCRETE PRODUCTS ROBERTS, WI54023 | — | — | 6.0 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. | 0.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Hammond compares by contaminant
Explore where Hammond ranks among all Wisconsin cities for specific contaminants.
Water source & infrastructure
Where Hammond's water comes from
Hammond'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 1,884 people through 1 water system.
Water systems serving Hammond
| System Name | PWSID | Population | Source |
|---|---|---|---|
| HAMMOND WATERWORKS | WI6560121 | 1,884 | GW |
How Hammond compares
Full Wisconsin rankings →Hammond's score of 90.7/100 is above the average of 65/100 among major Wisconsin cities. It outscores 9 of 10 nearby cities.
Nearby cities
View Wisconsin rankings →About Hammond, WI
Wikipedia →Hammond is a village in St. Croix County, Wisconsin, United States. The population was 1,873 at the 2020 census. The village is within the Town of Hammond. Hammond was home to the Running of the Llamas.
Learn more about your water
Guides and resources related to Hammond's water quality findings.
Explore water quality across St. Croix
Frequently asked questions
Is Hammond, WI tap water safe to drink?
Hammond's water quality earned a grade of A (90.7/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #65 out of 446 cities tested in Wisconsin.
What contaminants are in Hammond's water?
Lead was measured at 0.0 ppb (90th percentile). 9 violations are on record.
How is Hammond'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 Hammond?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Hammond's water come from?
Hammond's water is sourced from Groundwater. The city has 1 water system serving approximately 1,884 residents.
What health violations has Hammond's water system had?
Hammond has 5 health-based violations on record. The most recent violation was recorded in June 2013. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Hammond's groundwater at risk of contamination?
Hammond 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 9 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 Hammond's water compare to other cities?
Hammond ranks #65 out of 446 cities in Wisconsin (better than 85% of state cities) and #2084 out of 15744 cities nationally (87th percentile). The grade of A reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Hammond's small water system affect quality?
Hammond's system serves approximately 1,884 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 9 violations on record.