Larsen Bay Water System
EPA ID: AK2250134 · 271 people served · 1 ZIP code
Pulled from the federal compliance ledger, 3 violations at Larsen Bay Water System remain without resolution — the utility delivers drinking water to roughly 271 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Larsen Bay Water System Source: EPA SDWIS service area boundaries.
Service area boundary — Grade A
Service Area Demographics
The Larsen Bay Water System serves a community with a median household income of $44,375 and an estimated 108 residents across its service area. Approximately 65% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Larsen Bay Water System's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
About 2% of homes in Kodiak Island Borough, Alaska rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How Larsen Bay Water System compares to EPA limits
What This Means For You
Lead at 1 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
Total Trihalomethanes (TTHM) at 3 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
E. coli at 7 Zero tolerance (any positive sample triggers immediate action) exceeds the EPA maximum of Zero tolerance (any positive sample triggers immediate action). Severe GI illness; potentially fatal kidney failure in children. Consider UV disinfection (99.99%) filtration.
Stage 2 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Lead was detected in this water system. reverse osmosis filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Larsen Bay Water System (EPA ID: AK2250134) is a community water system in Alaska that serves approximately 271 people from surface water sources.
This system serves ZIP code 99624 in Larsen Bay.
Average Home Safety Score: A (98/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| January 1, 2025 | E. coli | Monitoring | Resolved |
| January 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| December 1, 2024 | Total Coliform | Monitoring | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| June 1, 2024 | E. coli | Monitoring | Resolved |
| January 1, 2024 | Stage 1 DBP Rule | Monitoring | Resolved |
| February 1, 2023 | E. coli | Monitoring | Resolved |
| January 1, 2023 | E. coli | Monitoring | Resolved |
| January 1, 2023 | Lead | Monitoring | Resolved |
| January 1, 2023 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| E. coli | Microbiological | 7 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 3 | No |
| Stage 2 DBP Rule | Treatment Failure | 2 | Yes |
| Lead | Inorganic | 1 | No |
| Total Coliform | Microbiological | 1 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| Revised Total Coliform Rule | Microbiological | 1 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 99624 | 0.0012 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 3 (Low Risk)
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
- 99624 — Larsen Bay
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Larsen Bay Water System (AK2250134) on EPA.gov.
Frequently Asked Questions
Is Larsen Bay Water System water safe to drink?
Larsen Bay Water System has recorded 1 health-based violation in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does Larsen Bay Water System serve?
Larsen Bay Water System serves approximately 271 people across 1 ZIP code in Alaska.
Where does Larsen Bay Water System get its water?
The primary water source is surface water.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: LARSEN BAY WATER SYSTEM Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Larsen Bay Water System (EPA ID: AK2250134) — request the latest Consumer Confidence Report or ask about specific contaminants.