Is Kasigluk, AK Tap Water Safe to Drink?
Graded F — but Copper was detected above EPA limits. Here's what's in the water and how to remove it. What to do next ↓
44/100
waterverge.com Kasigluk, AK — Water Quality Report
Kasigluk's drinking water received a grade of F (44 out of 100), indicating failing water quality. The city's 2 water systems serve approximately 516 residents using groundwater.
Lead levels were measured at 5.6 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 215 violations on record, including 8 health-based violations. 37 remain unresolved.
What to know about Kasigluk's water
Kasigluk ranks #70 out of 79 cities in Alaska for water quality, placing it among the lowest-rated in the state.
Kasigluk 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.
As a small community water system, Kasigluk may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
The system has seen 98 violations in the past five years, suggesting a pattern of compliance challenges that residents should monitor closely.
Water quality score
See methodology →Is Kasigluk, AK water safe to drink?
Kasigluk's drinking water has significant quality concerns based on EPA testing data. With a grade of F (44/100), the system has issues across multiple categories. A water filter is recommended for all residents. The city's 2 water systems serve approximately 516 residents using groundwater (wells).
Recent water quality updates for Kasigluk
A timeline of significant water quality events, violations, and data updates.
Latest EPA compliance and testing data incorporated into Kasigluk's water quality assessment. Grade: F (44/100).
Contaminants: Revised Total Coliform Rule, Chlorine.
Contaminants: Chlorine, Revised Total Coliform Rule.
Contaminants: Revised Total Coliform Rule.
Key contaminant findings
Based on the most recent EPA sampling data for Kasigluk'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.
Exceeds EPA action level. Copper can leach from household plumbing — flush taps for 30 seconds before drinking.
Violation history
Kasigluk's water system has 215 total violations on record, including 8 health-based violations. 37 remain unresolved. 98 violations were issued in the last 5 years.
Where does Kasigluk's water come from?
Kasigluk's drinking water comes from groundwater (wells), supplied by 2 water systems serving approximately 516 people. Groundwater is generally less susceptible to surface contamination but can contain naturally occurring contaminants like arsenic, radon, and nitrate.
What Kasigluk residents can do
Recommended: NSF-certified water filter. This addresses the specific contaminants found in Kasigluk'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
Recommended water filters
Based on contaminants detected in Kasigluk'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. | 5.6 | 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. | 1.98 | 1.3 | mg/L | Inorganic | Over Limit |
Lead level trend (90th percentile)
Copper level (90th percentile)
Latest reading: 1.980 mg/L (2011)
EPA action level: 1.3 mg/L
See how Kasigluk compares by contaminant
Explore where Kasigluk ranks among all Alaska cities for specific contaminants.
Water source & infrastructure
Where Kasigluk's water comes from
Kasigluk'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 native american ownership and serves approximately 516 people through 2 water systems.
Water systems serving Kasigluk
| System Name | PWSID | Population | Source |
|---|---|---|---|
| NEW KASIGLUK WATER SYSTEM | AK2272016 | 276 | GW |
| OLD KASIGLUK - AKIUK | AK2272752 | 240 | GW |
How Kasigluk compares
Full Alaska rankings →Kasigluk's score of 44/100 is below the average of 61/100 among major Alaska cities. It outscores 4 of 10 nearby cities. 6 of 10 nearby cities score higher.
Nearby cities
View Alaska rankings →About Kasigluk, AK
Wikipedia →Kasigluk is a census-designated place (CDP) in the Bethel Census Area in the U.S. state of Alaska. As of the 2020 census, Kasigluk had a population of 623. Kasigluk consists of two smaller villages, called Akiuk and Akula.
Learn more about your water
Guides and resources related to Kasigluk's water quality findings.
Explore water quality across Bethel Census Area
Frequently asked questions
Is Kasigluk, AK tap water safe to drink?
Kasigluk's water quality earned a grade of F (44/100). Significant issues have been found. A water filter is strongly recommended. The city ranks #70 out of 79 cities tested in Alaska.
What contaminants are in Kasigluk's water?
Lead was measured at 5.6 ppb (90th percentile). 215 violations are on record.
How is Kasigluk'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 Kasigluk?
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 Kasigluk's water come from?
Kasigluk's water is sourced from Groundwater. The city has 2 water systems serving approximately 516 residents.
What health violations has Kasigluk's water system had?
Kasigluk has 8 health-based violations on record. The most recent violation was recorded in December 2025. Health-based violations mean the water exceeded EPA maximum contaminant levels (MCLs) for a regulated substance. 37 violations remain unresolved.
Is Kasigluk's groundwater at risk of contamination?
Kasigluk 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 215 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 Kasigluk's water compare to other cities?
Kasigluk ranks #70 out of 79 cities in Alaska (better than 11% of state cities) and #14498 out of 15744 cities nationally (8th percentile). The grade of F reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.