Water Quality in Larsen Bay, AK: 17 Violations — Grade A
Grade A · Score 87/100 · 1 water system · Updated 2026-05-03
Larsen Bay's water meets all EPA standards with no health-based violations.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-05-03
Tracked under the EPA Safe Drinking Water program, Larsen Bay, AK shows 17 water violations on file — findings that span multiple violation categories and are detailed system by system in the data grid further down the page.
Water Quality by ZIP Code in Larsen Bay
Water quality varies across Larsen Bay's 1 ZIP codes. Check your specific ZIP for detailed contaminant data.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 99624 | A | 98 | 17 | 1 | View report → |
Water Quality Overview
Larsen Bay, Alaska receives a water quality grade of A with an overall score of 87 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
The 1 water system serving Larsen Bay have accumulated 17 EPA violations, including 1 health-based violation. These violations are tracked across 1 ZIP codes serving approximately 271 people.
What Grade A Means
A grade of A indicates excellent compliance with EPA drinking water standards. Larsen Bay's water systems have maintained strong performance in both contaminant monitoring and regulatory compliance.
Lead Levels
The average 90th percentile lead level across Larsen Bay water systems is 0.0012 mg/L — within EPA limits. No ZIP codes exceed the EPA lead action level.
With 65% of homes built before 1986, Larsen Bay has a higher-than-average risk of lead from older plumbing. Lead solder was banned in 1986, and homes built before this date may have lead in pipes, solder joints, or fixtures.
Radon Risk
Larsen Bay is in EPA Radon Zone 1 (High risk). The EPA recommends all homes in Zone 1 areas be tested for radon. Radon is the second leading cause of lung cancer after smoking.
Water Systems Serving Larsen Bay
Larsen Bay is served by 1 community water system regulated under the Safe Drinking Water Act. These systems collectively serve approximately 271 people across 1 ZIP codes.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Larsen Bay. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Larsen Bay
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR — your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test — certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration — NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories — monitor your local utility website and local news for boil water advisories or system alerts
Contaminants Detected in Larsen Bay Water Systems
The following contaminants have been detected or caused violations across Larsen Bay's water systems:
| Contaminant | Category | MCL | Violations | ZIPs Affected | Health-Based |
|---|---|---|---|---|---|
| E. coli | Microbiological | N/A | 7 | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 0.08 mg/L | 3 | 1 | No |
| Stage 2 DBP Rule | Treatment Technique | N/A | 2 | 1 | Yes |
| Revised Total Coliform Rule | Microbiological | N/A | 1 | 1 | No |
| Stage 1 DBP Rule | Treatment Technique | N/A | 1 | 1 | No |
| Lead | Inorganic | 0.015 mg/L | 1 | 1 | No |
| Total Coliform | Microbiological | N/A | 1 | 1 | No |
MCL = Maximum Contaminant Level (EPA enforceable standard). Health-based violations indicate levels that may pose direct health risks.
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Larsen Bay. Recent actions:
| Date | Action Type |
|---|---|
| 2025-08-05 | State Order Extension |
| 2025-06-11 | State Informal Action |
| 2025-06-04 | State Informal Action |
| 2025-04-28 | State Informal Action |
| 2025-04-21 | State Informal Enforcement |
| 2025-04-07 | State Informal Action |
| 2025-03-14 | State Order Extension |
| 2025-03-12 | State Informal Action |
| 2025-01-02 | State Order Extension |
| 2024-12-17 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-08-05.
Larsen Bay vs. Nearby Alaska Cities
How Larsen Bay's water quality compares to similar cities in Alaska:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Larsen Bay | A | 17 | 1 | 271 |
| Lake Minchumina | D | 0 | 1 | 271 |
| Tanana | C | 101 | 1 | 271 |
| Shaktoolik | B | 91 | 1 | 270 |
Common Questions About Larsen Bay Water
These are the most common questions residents search for about water quality in Larsen Bay, Alaska:
Is Larsen Bay water hard or soft? Water hardness varies by source. Larsen Bay's 1 water system uses a single source. Check your ZIP code report for specific hardness data.
Can I drink Larsen Bay tap water? Larsen Bay's water receives a grade of A (87/100). There are 1 health-based violations — consider filtration.
What is the best water filter for Larsen Bay? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Larsen Bay vs. Alaska Average
Understanding how Larsen Bay compares to the broader Alaska average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below — water quality can vary significantly even within Larsen Bay.
ZIP Codes in Larsen Bay
Larsen Bay spans 1 ZIP code. The ZIP with the lowest water quality score is 99624. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.
Frequently Asked Questions
Your Water is Safe — Here's How to Keep It That Way
Grade A is excellent news. Here's what proactive homeowners do to maintain water quality:
Annual Water Testing
EPA recommends annual testing even with clean water. Home test kits: $20-$50. Catches changes before they become problems.
Maintenance Filtration
A basic carbon filter removes chlorine taste and catches emerging contaminants like PFAS that aren't yet fully regulated.
Plumbing Check
Even safe city water picks up lead from home pipes. If your home was built before 1986, a one-time pipe inspection is recommended.