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WaterSafeCheck

ZIP Code 99591 Water Quality Report

Saint George Island, AK · Aleutians West Census Area County

Safety Score
D

Water Safety Grade

Poor — Multiple violations recorded

Health Violations

0

Total Violations

0

Lead Risk

High

Contaminants

0

About Tap Water in ZIP Code 99591

Tap water in ZIP code 99591 (Saint George Island, AK) has received a D grade (score: 50/100) — below average for the nation. UNALASKA WATER SYSTEM has recorded notable violations with EPA Safe Drinking Water Act regulations. Residents may want to consider additional filtration and review their annual Consumer Confidence Report.

Water System

UNALASKA WATER SYSTEM

EPA ID: AK2260309

Water Source

Surface Water

Population Served

9,400 residents

County

Aleutians West Census Area County, Alaska

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Lead Levels in ZIP 99591

EPA action level: 15 ppb | Public health goal: 0 ppb

Lead Data Not Available

Lead testing data was not found in EPA records for ZIP code 99591. This may occur with very small systems or systems that report under a parent utility. Contact UNALASKA WATER SYSTEM directly to request lead testing results or a copy of their Consumer Confidence Report.

Lead exposure risk in 99591 is rated High. EPA models estimate a 60% probability of lead exposure risk in this ZIP code based on housing age, infrastructure age, and water system data. This typically reflects older housing stock built before 1986 (when lead pipes were banned), aging distribution infrastructure, or detected lead levels in water samples. Families should prioritize getting their tap water tested independently and installing a certified lead-reducing filter.

Lead Exposure Risk Rating
High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

60%
Note: Lead levels above are the 90th percentile from EPA monitoring — meaning 90% of samples were at or below this level. Even "undetected" tap water lead doesn't account for lead leaching from home plumbing. If your home was built before 1986, individual tap testing is recommended.
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Violation History

Past 5 years — EPA SDWIS data

UNALASKA WATER SYSTEM has recorded zero violations in the EPA compliance database over the past 5 years — a strong indicator of consistent regulatory compliance and careful monitoring.

Total Violations (5 yr)
0
Health-Based Violations
0
Unresolved Violations
0
Boil Water Advisories
0
Compliance Risk
Unknown
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Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 99591. This means EPA monitoring has not found levels of regulated contaminants exceeding the Maximum Contaminant Levels (MCLs) set under the Safe Drinking Water Act — a positive indicator of water quality compliance.

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Water Source & Environmental Factors

Surface Water

This system draws water from lakes, rivers, or reservoirs. Surface water is treated to remove sediment, microorganisms, and chemical contaminants before reaching taps.

Water Source Type
Surface Water
Energy Burden

% of household income spent on energy — indicator of older infrastructure

4.02%

🛡 What Should You Do? — ZIP 99591 Recommendations

  • 🚨 Install a certified NSF/ANSI 53 or 58 (reverse osmosis) filter immediately for drinking and cooking
  • 🚨 Do not give unfiltered water to children, pregnant women, or immunocompromised individuals
  • 🚨 Contact UNALASKA WATER SYSTEM to request the current violation status and corrective action plan
  • 🚨 Report concerns to your state environmental agency or call the EPA hotline: 1-800-426-4791
  • 🚨 Consider having your home's tap water independently tested by a certified lab

Frequently Asked Questions — ZIP 99591 Water Quality

Is tap water safe to drink in ZIP code 99591?+
Tap water in 99591 has a below-average water quality grade of D. While it is treated, there have been notable compliance issues. We strongly recommend using a certified NSF/ANSI 53 water filter for drinking and cooking, especially for vulnerable populations.
What is the lead level in 99591 tap water?+
Lead level data from EPA monitoring is not available for 99591. Contact UNALASKA WATER SYSTEM directly for the most recent lead testing results.
Who provides tap water to 99591?+
Tap water in ZIP code 99591 is provided by UNALASKA WATER SYSTEM (EPA ID: AK2260309). This system serves approximately 9,400 residents. You can contact them directly for Consumer Confidence Reports, current advisories, and billing information.
What is the water source for 99591?+
ZIP code 99591 is served by surface water. Surface water systems draw from rivers, lakes, or reservoirs and must meet strict EPA treatment requirements including filtration and disinfection.
Does 99591 have any active water quality violations?+
No active violations are on record for ZIP code 99591. EPA data shows this water system is currently in compliance with Safe Drinking Water Act standards.
How do I get a copy of my water quality report for 99591?+
Your water utility — UNALASKA WATER SYSTEM — is required by law to send you an annual Consumer Confidence Report (CCR) by July 1 each year. You can also request it directly from the utility or find it online by searching "UNALASKA WATER SYSTEM Consumer Confidence Report." The EPA's ECHO database also has historical compliance data.
What water filter should I use in 99591?+
The right filter depends on what contaminants are present. For lead, look for a filter certified to NSF/ANSI Standard 53. For chlorine byproducts (like THMs), NSF/ANSI 42 filters work well. For a broad range of contaminants including PFAS, look for NSF/ANSI 58 (reverse osmosis) systems. For ZIP code 99591, with a clean compliance record, a standard carbon block filter meeting NSF/ANSI 42 is a good choice for taste and as a precaution.
Is 99591 tap water safe for babies and infants?+
Infants are especially vulnerable to lead, nitrates, and microbial contaminants in drinking water. Current EPA data for 99591 shows no available lead data — we recommend using a certified NSF/ANSI 53 lead filter as a precaution for infant formula. Always consult your pediatrician for guidance specific to your child's health.

Data Sources & Methodology

Water quality data for ZIP code 99591 is compiled from the EPA Safe Drinking Water Information System (SDWIS), EPA ECHO enforcement database, UCMR5 unregulated contaminant monitoring, and Consumer Confidence Reports filed by UNALASKA WATER SYSTEM. Safety scores are composite metrics derived from violation history, lead levels, enforcement actions, and infrastructure risk indicators. Data reflects a 5-year monitoring window. Last dataset update: 2024. View EPA source data →