Is Hanna, WY Tap Water Safe to Drink?
Graded A- — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
89.4/100
waterverge.com Hanna, WY — Water Quality Report
Hanna's drinking water received a grade of A- (89.4 out of 100), indicating good water quality. The city's 1 water system serves approximately 841 residents using surface water.
Lead levels were measured at 2.0 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 22 violations on record, including 2 health-based violations. 1 remains unresolved.
What to know about Hanna's water
Hanna ranks #8 out of 65 cities in Wyoming for water quality, placing it above average in the state.
The city draws from surface water sources, which are more susceptible to seasonal runoff and agricultural contamination, requiring extensive multi-barrier treatment including coagulation, filtration, and disinfection.
Hexavalent chromium (chromium-6) was detected at 0.07 µg/L in UCMR 3 testing. While below California's 10 µg/L limit and with no federal MCL set, residents sensitive to this contaminant may consider reverse osmosis filtration.
As a small community water system, Hanna may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
Water quality score
See methodology →Is Hanna, WY water safe to drink?
Hanna's tap water meets most EPA standards but has areas that warrant attention. With a grade of A- (89.4/100), some contaminant levels or compliance issues suggest that residents may benefit from additional filtration. The city's 1 water system serves approximately 841 residents using surface water (rivers, lakes, or reservoirs).
Recent water quality updates for Hanna
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Hanna's water quality assessment. Grade: A- (89.4/100).
Contaminants: Total Haloacetic Acids (HAA5), TTHM.
Contaminants: Coliform (TCR).
Contaminants: Coliform (TCR).
Key contaminant findings
Based on the most recent EPA sampling data for Hanna's water supply.
Well within EPA limits.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Hanna's water system has 22 total violations on record, including 2 health-based violations. 1 remain unresolved.
Where does Hanna's water come from?
Hanna's drinking water comes from surface water (rivers, lakes, or reservoirs), supplied by 1 water system serving approximately 841 people. Surface water sources are more susceptible to contamination from runoff, industrial discharge, and algal blooms, requiring extensive treatment. Nearby water bodies include Medicine Bow R Ab Seminoe Reservoir, Nr Hanna (river).
What Hanna 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
D4 — exceptional droughtCarbon County is currently in D4 (exceptional drought) per the U.S. Drought Monitor (week of May 5, 2026). 6.0% of the county is in D4 (exceptional) drought. 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 Hanna'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. | 2.0 | 15 | ppb | Inorganic | Safe |
| Copper (90th percentile) CopperInorganic A metal that enters drinking water mainly through corrosion of copper plumbing. Small amounts are essential for health, but excess levels are harmful. Health EffectsGastrointestinal distress (nausea, vomiting, diarrhea) at short-term high levels; liver and kidney damage from long-term exposure. EPA Limit1.3 mg/L action level Common SourcesCorrosion of copper household plumbing, erosion of natural deposits. | 2.20 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 2.200 mg/L (2017)
EPA action level: 1.3 mg/L
See how Hanna compares by contaminant
Explore where Hanna ranks among all Wyoming cities for specific contaminants.
Water source & infrastructure
Where Hanna's water comes from
Hanna's drinking water comes primarily from surface water sources such as rivers, lakes, or reservoirs.
Surface water systems require multi-stage treatment including coagulation, sedimentation, filtration, and disinfection to meet EPA Safe Drinking Water Act standards.
These sources can be impacted by seasonal changes, stormwater runoff, upstream agriculture, and industrial discharge.
The system is operated by local government ownership and serves approximately 841 people through 1 water system.
Water bodies near Hanna
Hanna is located near 1 notable water body. As a surface water system, these water bodies may directly influence the city's drinking water supply.
Water systems serving Hanna
| System Name | PWSID | Population | Source |
|---|---|---|---|
| HANNA, TOWN OF | WY5600025 | 841 | SW |
How Hanna compares
Full Wyoming rankings →Hanna's score of 89.4/100 is above the average of 55/100 among major Wyoming cities. It outscores 10 of 10 nearby cities.
Nearby cities
View Wyoming rankings →About Hanna, WY
Learn more about your water
Guides and resources related to Hanna's water quality findings.
Explore water quality across Carbon
Frequently asked questions
Is Hanna, WY tap water safe to drink?
Hanna's water quality earned a grade of A- (89.4/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #8 out of 65 cities tested in Wyoming.
What contaminants are in Hanna's water?
Lead was measured at 2.0 ppb (90th percentile). 22 violations are on record.
How is Hanna'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 Hanna?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Hanna's water come from?
Hanna's water is sourced from Surface water. The city has 1 water system serving approximately 841 residents.
What health violations has Hanna's water system had?
Hanna has 2 health-based violations on record. The most recent violation was recorded in September 2016. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 1 violation remains unresolved.
How does Hanna's water compare to other cities?
Hanna ranks #8 out of 65 cities in Wyoming (better than 88% of state cities) and #2857 out of 15744 cities nationally (82th percentile). The grade of A- reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Hanna's small water system affect quality?
Hanna's system serves approximately 841 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 22 violations on record.