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Official EPA SDWIS Verified ReportWater Quality & Testing GuideHistorical Record: No Recorded SDWIS Violations

ZIP Code 99633 Water Quality & Testing Report

Naknek, AK · Bristol Bay Borough County · Updated for 2026

Sahajul HaqueCompiled & verified by Sahajul Haque from official EPA SDWIS records
Public Health & Medical Notice: Drinking water quality data on this page reflects historical compliance records submitted under the Safe Drinking Water Act. This information does not constitute medical advice or a real-time safety guarantee. If you are pregnant, nursing, preparing infant formula, or immunocompromised, consult a healthcare provider. Boiling water kills biological pathogens, but does NOT remove chemical contaminants like lead, arsenic, or PFAS.
Quick EPA Verified Answer

Is Tap Water Safe to Drink in ZIP 99633 (Naknek, AK)?

Caution / Filtration Recommended: Tap water in ZIP code 99633 (Naknek, AK) has compliance concerns, earning an EPA Safety Grade of D (50/100) due to 0 health violation(s) and 0 ppb lead. While treated by SOUTH NAKNEK WATER SYSTEM, residents are advised to use an NSF/ANSI 53 certified water filter for drinking and cooking.

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 99633

Tap water in ZIP code 99633 (Naknek, AK) is distributed by SOUTH NAKNEK WATER SYSTEM (EPA ID: AK2260333), serving approximately 66 residents. Based on EPA Safe Drinking Water Act compliance records, this system receives a water safety grade of D with a composite quality score of 50/100.

Water System

SOUTH NAKNEK WATER SYSTEM

EPA ID: AK2260333

Water Source

Ground Water

Population Served

66 residents

County

Bristol Bay Borough County, Alaska

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Lead Levels in ZIP 99633

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 99633. Contact SOUTH NAKNEK WATER SYSTEM to request lead testing results.

Lead exposure risk in 99633 is rated High. EPA models estimate a 47% exposure probability based on housing and infrastructure age.

Lead Exposure Risk Rating
High
Lead Exposure Probability

EPA model estimate based on housing age and infrastructure

47%
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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Water Hardness & Mineral Content

Grains per gallon (GPG) & Parts per million (PPM / mg/L)

Classification: Moderately Hard6.2 GPG · 106 mg/L

Water in ZIP 99633 is Moderately Hard (106 mg/L / 6.2 GPG). It contains beneficial natural minerals like calcium and magnesium without causing heavy scale accumulation.

Recommendation: A water softener is optional. Regular maintenance of hot water appliances is recommended.
Hardness (GPG)

Grains per gallon

6.2 GPG
Hardness (PPM / mg/L)

Parts per million CaCO3

106 mg/L
Appliance Scaling Risk
Low / Moderate

Interactive Water Safety & Filter Matcher

Personalized for ZIP 99633 (Naknek, AK)

Free Tool

Official EPA SDWIS Database Entry

Utility: SOUTH NAKNEK WATER SYSTEM · PWSID: AK2260333

Verify on EPA.gov
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Violation History

Past 5 years — EPA SDWIS data

SOUTH NAKNEK WATER SYSTEM has recorded zero violations in the EPA compliance database over the past 5 years.

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

Contaminants Detected

Contaminants with health-based violations on record

No health-based contaminant violations are on record for ZIP code 99633 under the Safe Drinking Water Act.

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Water Source & Environmental Factors

Ground Water

This system draws water from underground aquifers. Groundwater is naturally filtered through soil and rock, but can still contain naturally occurring minerals like arsenic, radium, or nitrates.

Water Source Type
Ground Water
Energy Burden

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

4.76%

Water Quality Testing in ZIP 99633

Tap Water & Well Testing Recommendations

Residents in ZIP code 99633 served by SOUTH NAKNEK WATER SYSTEM can test tap water or private well systems to verify water purity. Testing detects hidden contaminants before they impact family health.

Tap Water Testing Steps

  • 1.Conduct a certified lead check if your home was constructed before 1986.
  • 2.Use certified lab testing kits rather than uncalibrated test strips for regulated compliance.
  • 3.Sample water from both your kitchen faucet and water heater to compare line purity.

Private Well Testing Steps

  • •Test for Coliform bacteria and Nitrates annually.
  • •Test for heavy metals, radon, and PFAS every 3 years.
  • •Send samples to a state-certified drinking water laboratory recognized by Alaska Department of Environmental Conservation.
Certified Lab Testing: Always use an EPA-certified drinking water laboratory in AK for formal legal or real estate compliance testing.

🛡 What Should You Do? — ZIP 99633 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 SOUTH NAKNEK 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

Recommended Water Treatment Systems:

REQUIRED FOR SAFETY
🏺

NSF 53 Lead Pitcher Filter

Certified to remove lead. Recommended for immediate protection.

Lead Filter Guide →
STRONGLY RECOMMENDED
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NSF 58 Under-Sink RO System

Reverse Osmosis system certified to remove PFAS, heavy metals, and viruses.

RO System Guide →

Frequently Asked Questions — ZIP 99633 Water Quality

Is tap water safe to drink in ZIP code 99633?+
Tap water in 99633 has a below-average safety grade of D due to compliance issues. We recommend using a certified water filter for drinking and cooking.
How do I get my water tested in ZIP 99633 (Naknek, AK)?+
To test water quality in ZIP 99633, you can order a certified drinking water test kit or send water samples to an EPA/NELAP certified laboratory in AK. Certified testing checks for lead, coliform bacteria, nitrates, hardness, and PFAS that standard test strips miss. Contact Alaska Department of Environmental Conservation for a list of certified regional labs.
How hard is the tap water in 99633?+
Tap water in 99633 is classified as Moderately Hard with an estimated mineral hardness of 106 mg/L (6.2 GPG). A water softener is optional. Regular maintenance of hot water appliances is recommended.
Should I test private well water in 99633?+
Yes. Unlike municipal systems, private wells in 99633 are not regulated by the EPA or local utilities. Private well owners should test their water annually for coliform bacteria and nitrates, and every 3 to 5 years for heavy metals (lead, arsenic) and volatile organic compounds.
What is the lead level in 99633 tap water?+
Lead level data is not available in EPA records for 99633. Contact your utility for details.
Is there an active boil water notice in 99633?+
There are currently no active boil water advisories on record for 99633. Water treatment systems are operating within normal parameters.
Who provides tap water to 99633?+
Tap water in ZIP code 99633 is provided by SOUTH NAKNEK WATER SYSTEM (EPA ID: AK2260333), serving approximately 66 residents.
What water filter should I use in 99633?+
Based on water metrics for 99633, we recommend Lead & Microplastic Filter. Look for certifications such as NSF/ANSI 53 (Lead Reduction), NSF/ANSI 42 (Particulate/Taste).

Data Sources & Methodology

Water quality data for ZIP code 99633 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 SOUTH NAKNEK 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 →