Is Cornville, AZ Tap Water Safe to Drink?
Graded F, with 59 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
43/100
waterverge.com Cornville, AZ — Water Quality Report
Cornville's drinking water received a grade of F (43 out of 100), indicating failing water quality. The city's 4 water systems serve approximately 3,374 residents using groundwater.
Lead levels were measured at 10.0 ppb (90th percentile), which is within EPA limits but above recommended levels. This system has not yet been tested for PFAS under the EPA UCMR 5 program.
The system has 322 violations on record, including 21 health-based violations. 59 remain unresolved.
What to know about Cornville's water
Cornville ranks #263 out of 292 cities in Arizona for water quality, placing it among the lowest-rated in the state.
Cornville 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.
While lead levels are within EPA limits, they are above the recommended 5 ppb threshold that health organizations consider ideal. A point-of-use filter adds an extra layer of protection.
The system has seen 21 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Cornville, AZ water safe to drink?
Cornville's drinking water has significant quality concerns based on EPA testing data. With a grade of F (43/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 4 water systems serve approximately 3,374 residents using groundwater (wells).
Recent water quality updates for Cornville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Cornville's water quality assessment. Grade: F (43/100).
Contaminants: Public Notice.
Contaminants: Consumer Confidence Rule.
Contaminants: Arsenic, Consumer Confidence Rule.
Federal disaster declaration (FEMA DR-3241). Hurricane event — may have impacted local water infrastructure.
Federal disaster declaration (FEMA DR-977). Flood event — may have impacted local water infrastructure.
Key contaminant findings
Based on the most recent EPA sampling data for Cornville's water supply.
Within EPA limits but above the American Academy of Pediatrics recommended level of 1 ppb. An NSF 53-certified filter provides additional protection.
Violation history
Cornville's water system has 322 total violations on record, including 21 health-based violations. 59 remain unresolved. 21 violations were issued in the last 5 years.
Flood & environmental risk
Yavapai County has experienced 6 federally declared disasters since 1978. 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 Sycamore Creek Above Verde Rvr,, Verde River, Oak Creek, Verde River Above Camp Verde.
Where does Cornville's water come from?
Cornville's drinking water comes from groundwater (wells), supplied by 4 water systems serving approximately 3,374 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Sycamore Creek Above Verde Rvr, (river), Verde River (river), Oak Creek (river), Verde River Above Camp Verde (river).
What Cornville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Cornville'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.
Cornville'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 Cornville
Industrial polluters nearby
Reported releases to surface water by facilities near Cornville, ranked by pounds discharged annually.
| Facility | Top chemical | To surface water (lbs/yr) | Distance |
|---|---|---|---|
PHOENIX CEMENT CO CLARKDALE, AZ86324 | — | — | 9.8 mi |
Source: EPA Toxic Release Inventory (TRI) 2023
Drought conditions
D2 — severe droughtYavapai 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
Yavapai County has experienced 6 federally declared disasters since 1978. Flooding and severe weather can compromise water treatment infrastructure and introduce contaminants into drinking water supplies.
Recommended water filters
Based on contaminants detected in Cornville's water supply, we recommend the following filter types.
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. | 10.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Cornville compares by contaminant
Explore where Cornville ranks among all Arizona cities for specific contaminants.
Water source & infrastructure
Where Cornville's water comes from
Cornville'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 public/private ownership and serves approximately 3,374 people through 4 water systems.
Water bodies near Cornville
Cornville is located near 4 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Cornville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| COTTONWOOD MUNICIPAL WATER VSF1 | AZ0413164 | 2,194 | GW |
| CS OAK CREEK PUBLIC SERVICE LLC | AZ0413042 | 650 | GW |
| OAK CREEK VALLEY | AZ0413121 | 450 | GW |
| MOUNTAIN VU RV COURT | AZ0413393 | 80 | GW |
How Cornville compares
Full Arizona rankings →Cornville's score of 43/100 is on par with the average of 42/100 among major Arizona cities. It outscores 7 of 10 nearby cities.
Nearby cities
View Arizona rankings →About Cornville, AZ
Wikipedia →Cottonwood is a city in Yavapai County, Arizona, United States. As of the 2020 census, Cottonwood had a population of 12,029. It is located on the Verde River.
Learn more about your water
Guides and resources related to Cornville's water quality findings.
Explore water quality across Yavapai
Frequently asked questions
Is Cornville, AZ tap water safe to drink?
Cornville's water quality earned a grade of F (43/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #263 out of 292 cities tested in Arizona.
What contaminants are in Cornville's water?
Lead was measured at 10.0 ppb (90th percentile). 322 violations are on record.
How is Cornville'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 Cornville?
While lead levels are within EPA limits, a filter adds extra protection. Based on current data, basic filtration should suffice for additional peace of mind.
Where does Cornville's water come from?
Cornville's water is sourced from Groundwater. The city has 4 water systems serving approximately 3,374 residents.
What health violations has Cornville's water system had?
Cornville has 21 health-based violations on record. The most recent violation was recorded in November 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 59 violations remain unresolved.
Is Cornville's groundwater at risk of contamination?
Cornville 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 322 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 Cornville's water compare to other cities?
Cornville ranks #263 out of 292 cities in Arizona (better than 10% of state cities) and #14680 out of 15744 cities nationally (7th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.