Is Deerfield, KS Tap Water Safe to Drink?
Graded B, with 3 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
78.9/100
waterverge.com Deerfield, KS — Water Quality Report
Deerfield's drinking water received a grade of B (78.9 out of 100), indicating good water quality. The city's 1 water system serves approximately 692 residents using groundwater.
Lead levels were measured at 4.0 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 2 health-based violations. 3 remain unresolved.
What to know about Deerfield's water
Deerfield ranks #179 out of 323 cities in Kansas for water quality, placing it below average in the state.
Deerfield 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, Deerfield may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 8 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Deerfield, KS water safe to drink?
Deerfield's drinking water has significant quality concerns based on EPA testing data. With a grade of B (78.9/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 692 residents using groundwater (wells).
Recent water quality updates for Deerfield
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Deerfield's water quality assessment. Grade: B (78.9/100).
Contaminants: LEAD AND COPPER RULE REVISIONS.
Contaminants: Revised Total Coliform Rule, Chlorine.
Contaminants: Revised Total Coliform Rule, Chlorine.
Federal disaster declaration (FEMA DR-3236). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-201). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Deerfield's water supply.
Well within EPA limits.
Violation history
Deerfield's water system has 9 total violations on record, including 2 health-based violations. 3 remain unresolved. 8 violations were issued in the last 5 years.
Flood & environmental risk
Kearny County has experienced 2 federally declared disasters since 1965. 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 Southside Ditch Return Nr Deerfield, Arkansas R, Farmers Ditch Nr Deerfield.
Where does Deerfield's water come from?
Deerfield's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 692 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Southside Ditch Return Nr Deerfield (stream), Arkansas R (river), Farmers Ditch Nr Deerfield (stream).
What Deerfield residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Deerfield'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.
Run cold water for 30 seconds before drinking, especially in the morning. Lead and copper leach from household plumbing when water sits in pipes.
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 Deerfield
Industrial polluters nearby
Reported releases to surface water by facilities near Deerfield, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
TYSON FRESH MEATS INC. HOLCOMB, KS67851 | — | — | 6.7 mi |
HOLCOMB UNIT 1 HOLCOMB, KS67851 | — | — | 8.5 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtKearny County is currently in D2 (severe drought) per the U.S. Drought Monitor (week of May 5, 2026). Drought can elevate disinfection-byproduct (TTHM/HAA5) levels and taste/odor issues as utilities draw from lower reservoirs.
Source: U.S. Drought Monitor, updated weekly by NDMC, USDA, and NOAA.
Flood & disaster history
Kearny County has experienced 2 federally declared disasters since 1965. 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. | 4.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Deerfield compares by contaminant
Explore where Deerfield ranks among all Kansas cities for specific contaminants.
Water source & infrastructure
Where Deerfield's water comes from
Deerfield'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 692 people through 1 water system.
Water bodies near Deerfield
Deerfield is located near 3 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Deerfield
| System Name | PWSID | Population | Source |
|---|---|---|---|
| DEERFIELD, CITY OF | KS2009302 | 692 | GW |
How Deerfield compares
Full Kansas rankings →Deerfield's score of 78.9/100 is above the average of 62/100 among major Kansas cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Kansas rankings →About Deerfield, KS
Learn more about your water
Guides and resources related to Deerfield's water quality findings.
Explore water quality across Kearny
Frequently asked questions
Is Deerfield, KS tap water safe to drink?
Deerfield's water quality earned a grade of B (78.9/100). Some concerns have been identified. Consider a water filter for an extra layer of protection. The city ranks #179 out of 323 cities tested in Kansas.
What contaminants are in Deerfield's water?
Lead was measured at 4.0 ppb (90th percentile). 9 violations are on record.
How is Deerfield'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 Deerfield?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Deerfield's water come from?
Deerfield's water is sourced from Groundwater. The city has 1 water system serving approximately 692 residents.
What health violations has Deerfield's water system had?
Deerfield has 2 health-based violations on record. The most recent violation was recorded in July 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 3 violations remain unresolved.
Is Deerfield's groundwater at risk of contamination?
Deerfield 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 Deerfield's water compare to other cities?
Deerfield ranks #179 out of 323 cities in Kansas (better than 45% of state cities) and #8477 out of 15744 cities nationally (46th percentile). The grade of B reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Deerfield's small water system affect quality?
Deerfield's system serves approximately 692 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.