Is Thayne, WY Tap Water Safe to Drink?
Graded D, with 34 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
46/100
waterverge.com Thayne, WY — Water Quality Report
Thayne's drinking water received a grade of D (46 out of 100), indicating poor water quality. The city's 5 water systems serve approximately 4,340 residents using groundwater.
Lead levels were measured at 8.0 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 465 violations on record, including 17 health-based violations. 34 remain unresolved.
What to know about Thayne's water
Thayne ranks #55 out of 65 cities in Wyoming for water quality, placing it among the lowest-rated in the state.
Thayne 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 76 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Thayne, WY water safe to drink?
Thayne's drinking water has significant quality concerns based on EPA testing data. With a grade of D (46/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 5 water systems serve approximately 4,340 residents using groundwater (wells).
Recent water quality updates for Thayne
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Thayne's water quality assessment. Grade: D (46/100).
Contaminants: E. COLI.
Contaminants: Radium-228, Combined Uranium, Gross Alpha, Excl. Radon and U.
Contaminants: Nitrate-Nitrite, Gross Alpha, Excl. Radon and U, Combined Uranium.
Key contaminant findings
Based on the most recent EPA sampling data for Thayne'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
Thayne's water system has 465 total violations on record, including 17 health-based violations. 34 remain unresolved. 76 violations were issued in the last 5 years.
Where does Thayne's water come from?
Thayne's drinking water comes from groundwater (wells), supplied by 5 water systems serving approximately 4,340 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Salt River Above Reservoir, (river).
What Thayne residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Thayne'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
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.
Recommended water filters
Based on contaminants detected in Thayne'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. | 8.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Thayne compares by contaminant
Explore where Thayne ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Thayne's water comes from
Thayne'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 4,340 people through 5 water systems.
Water bodies near Thayne
Thayne is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Thayne
| System Name | PWSID | Population | Source |
|---|---|---|---|
| STAR VALLEY RANCH, TOWN OF | WY5600287 | 2,030 | GW |
| LEISURE VALLEY INC/ STAR VALLEY RV PARK | WY5601471 | 1,910 | GW |
| THAYNE, TOWN OF | WY5600159 | 366 | GW |
| CEDAR SPRINGS MEADOWS | WY5601720 | 19 | GW |
| NORTH FORTY SUBDIVISION | WY5601719 | 15 | GW |
How Thayne compares
Full Wyoming rankings →Thayne's score of 46/100 is below the average of 55/100 among major Wyoming cities. It outscores 5 of 10 nearby cities.
Nearby cities
View Wyoming rankings →About Thayne, WY
Wikipedia →Star Valley Ranch is a town in Lincoln County, Wyoming, United States. The population was 1,866 at the 2020 census. It was incorporated on November 8, 2005; at the 2000 census, it was only a census-designated place (CDP).
Learn more about your water
Guides and resources related to Thayne's water quality findings.
Explore water quality across Lincoln
Frequently asked questions
Is Thayne, WY tap water safe to drink?
Thayne's water quality earned a grade of D (46/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #55 out of 65 cities tested in Wyoming.
What contaminants are in Thayne's water?
Lead was measured at 8.0 ppb (90th percentile). 465 violations are on record.
How is Thayne'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 Thayne?
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 Thayne's water come from?
Thayne's water is sourced from Groundwater. The city has 5 water systems serving approximately 4,340 residents.
What health violations has Thayne's water system had?
Thayne has 17 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. 34 violations remain unresolved.
Is Thayne's groundwater at risk of contamination?
Thayne 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 465 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 Thayne's water compare to other cities?
Thayne ranks #55 out of 65 cities in Wyoming (better than 15% of state cities) and #13966 out of 15744 cities nationally (11th percentile). The grade of D reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.