Is Lyman, WY Tap Water Safe to Drink?
Graded A-, with 2 unresolved violations on record. See what was cited — and what it means for your tap. What to do next ↓
87.9/100
waterverge.com Lyman, WY — Water Quality Report
Lyman's drinking water received a grade of A- (87.9 out of 100), indicating good water quality. The city's 2 water systems serve approximately 3,931 residents using ground water under influence.
Lead levels were measured at 1.0 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 51 violations on record, including 7 health-based violations. 2 remain unresolved.
What to know about Lyman's water
Lyman ranks #14 out of 65 cities in Wyoming for water quality, placing it above average in the state.
Lyman 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.
Water quality score
See methodology →Is Lyman, WY water safe to drink?
Lyman's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (87.9/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 2 water systems serve approximately 3,931 residents using groundwater (wells).
Recent water quality updates for Lyman
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Lyman's water quality assessment. Grade: A- (87.9/100).
Contaminants: Surface Water Treatment Rule.
Contaminants: Surface Water Treatment Rule.
1 health-based. Contaminants: Long Term 2 Enhanced Surface Water Treatment Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Lyman's water supply.
Well within EPA limits.
Violation history
Lyman's water system has 51 total violations on record, including 7 health-based violations. 2 remain unresolved. 3 violations were issued in the last 5 years.
Where does Lyman's water come from?
Lyman's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 3,931 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate. Nearby water bodies include Blacks Fork Above Smiths Fork, Near Lyman (river).
What Lyman residents can do
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 droughtUinta 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. | 1.0 | 15 | ppb | Inorganic | Safe |
Lead level trend (90th percentile)
See how Lyman compares by contaminant
Explore where Lyman ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Lyman's water comes from
Lyman'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 3,931 people through 2 water systems.
Water bodies near Lyman
Lyman is located near 1 notable water body. These water bodies contribute to the regional watershed and may indirectly affect groundwater quality.
Water systems serving Lyman
| System Name | PWSID | Population | Source |
|---|---|---|---|
| LYMAN, TOWN OF | WY5600033 | 2,203 | GU |
| BRIDGER VALLEY JOINT POWERS BOARD | WY5600757 | 1,728 | SW |
How Lyman compares
Full Wyoming rankings →Lyman's score of 87.9/100 is above the average of 55/100 among major Wyoming cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Wyoming rankings →About Lyman, WY
Wikipedia →Lyman is a town in Uinta County, Wyoming, United States. The population was 2,135 at the 2020 census.
Learn more about your water
Guides and resources related to Lyman's water quality findings.
Explore water quality across Uinta
Frequently asked questions
Is Lyman, WY tap water safe to drink?
Lyman's water quality earned a grade of A- (87.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #14 out of 65 cities tested in Wyoming.
What contaminants are in Lyman's water?
Lead was measured at 1.0 ppb (90th percentile). 51 violations are on record.
How is Lyman'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 Lyman?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Lyman's water come from?
Lyman's water is sourced from Ground water under influence. The city has 2 water systems serving approximately 3,931 residents.
What health violations has Lyman's water system had?
Lyman has 7 health-based violations on record. The most recent violation was recorded in May 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 2 violations remain unresolved.
Is Lyman's groundwater at risk of contamination?
Lyman 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 51 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 Lyman's water compare to other cities?
Lyman ranks #14 out of 65 cities in Wyoming (better than 78% of state cities) and #3763 out of 15744 cities nationally (76th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.