Is Cokeville, WY Tap Water Safe to Drink?
Graded D+, with 17 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
50/100
waterverge.com Cokeville, WY — Water Quality Report
Cokeville's drinking water received a grade of D+ (50 out of 100), indicating poor water quality. The city's 1 water system serves approximately 535 residents using groundwater.
Lead levels were measured at 1.1 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 135 violations on record, including 8 health-based violations. 17 remain unresolved.
What to know about Cokeville's water
Cokeville ranks #52 out of 65 cities in Wyoming for water quality, placing it among the lowest-rated in the state.
Cokeville 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, Cokeville may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 25 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Cokeville, WY water safe to drink?
Cokeville's drinking water has significant quality concerns based on EPA testing data. With a grade of D+ (50/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 1 water system serves approximately 535 residents using groundwater (wells).
Recent water quality updates for Cokeville
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Cokeville's water quality assessment. Grade: D+ (50/100).
Contaminants: Nitrate-Nitrite, Nitrite.
Contaminants: Combined Uranium, Gross Alpha, Excl. Radon and U, Combined Radium (-226 and -228).
Contaminants: TTHM, Total Haloacetic Acids (HAA5).
Key contaminant findings
Based on the most recent EPA sampling data for Cokeville's water supply.
Well within EPA limits.
Violation history
Cokeville's water system has 135 total violations on record, including 8 health-based violations. 17 remain unresolved. 25 violations were issued in the last 5 years.
Where does Cokeville's water come from?
Cokeville's drinking water comes from groundwater (wells), supplied by 1 water system serving approximately 535 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Bear River Below Pixley Dam, (river), Bear River Below Smiths Fork, Nr Cokeville (river), Bear River (river).
What Cokeville residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Cokeville'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
Drought conditions
D2 — severe droughtLincoln 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.
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. | 1.1 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Cokeville compares by contaminant
Explore where Cokeville ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Cokeville's water comes from
Cokeville'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 535 people through 1 water system.
Water bodies near Cokeville
Cokeville is located near 3 notable water bodies. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Cokeville
| System Name | PWSID | Population | Source |
|---|---|---|---|
| COKEVILLE, TOWN OF | WY5600015 | 535 | GW |
How Cokeville compares
Full Wyoming rankings →Cokeville's score of 50/100 is on par with the average of 55/100 among major Wyoming cities. It outscores 5 of 10 nearby cities.
Nearby cities
View Wyoming rankings →About Cokeville, WY
Wikipedia →Cokeville is a town in Lincoln County, Wyoming, United States. The population was 502 at the 2020 census. The town is known for the Cokeville Elementary School hostage crisis.
Learn more about your water
Guides and resources related to Cokeville's water quality findings.
Explore water quality across Lincoln
Frequently asked questions
Is Cokeville, WY tap water safe to drink?
Cokeville's water quality earned a grade of D+ (50/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #52 out of 65 cities tested in Wyoming.
What contaminants are in Cokeville's water?
Lead was measured at 1.1 ppb (90th percentile). 135 violations are on record.
How is Cokeville'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 Cokeville?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Cokeville's water come from?
Cokeville's water is sourced from Groundwater. The city has 1 water system serving approximately 535 residents.
What health violations has Cokeville's water system had?
Cokeville has 8 health-based violations on record. The most recent violation was recorded in October 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 17 violations remain unresolved.
Is Cokeville's groundwater at risk of contamination?
Cokeville 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 135 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 Cokeville's water compare to other cities?
Cokeville ranks #52 out of 65 cities in Wyoming (better than 20% of state cities) and #13198 out of 15744 cities nationally (16th percentile). The grade of D+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Cokeville's small water system affect quality?
Cokeville's system serves approximately 535 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 135 violations on record.