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County water report

Kodiak Island Borough Water Report

Drinking-water compliance, watershed health, monitoring records, and river conditions for Kodiak Island Borough, Alaska.

Water grade

F

Water score

6.8

State rank

#13

of 22

Health violations

74

EPA SDWIS, 5-year lookback

Watershed impaired

0.0%

1 water bodies assessed

Monitoring sites

12

2,154 recent measurements

Live streamflow

102%

TERROR R AT MOUTH NR KODIAK AK

Water at a glance

Key Water Indicators for Kodiak Island Borough

EPA SDWIS

Safety Grade

F

Score: 6.8 / 100

EPA SDWIS

Active Violations

74

5-year health-based lookback

EPA ATTAINS

Watershed Health

0% impaired

1 bodies assessed

USGS NWIS

Streamflow Snapshot

102% of mean

TERROR R AT MOUTH NR KODIAK AK

EPA WQP

Monitoring Sites

12

2,154 recent readings

Source: EPA SDWIS · Safe Drinking Water Information System

Drinking Water Compliance

Compliance grade

F

Based on EPA SDWIS compliance history.

Water score

Higher scores indicate cleaner recent compliance records.

6.8/100

Health violations

74

Health-based violations

Violations per 100K served

543.1

Population-normalized SDWIS rate

Editorial analysis

Understanding Kodiak Island Borough’s Water

Drinking Water Quality Overview

EPA SDWIS

Kodiak Island Borough's water systems carry a failing grade, scoring 6.8 out of 100. Over the past five years, EPA SDWIS records 74 health-based violations — a pattern that public water utilities are required to disclose and correct.

Watershed Conditions

EPA ATTAINS

Under the Clean Water Act §303(d), EPA ATTAINS tracks whether waterways meet quality standards for drinking, recreation, and aquatic life (reporting cycle: 2022). None of the assessed waterways are listed as impaired (0 of 1 water bodies) across Kodiak Island Borough's watersheds. Impairment does not mean tap water is unsafe — it measures ambient waterway conditions upstream of treatment, not finished drinking water.

River & Streamflow Status

USGS NWIS

USGS NWIS gauge data (as of 2026-05-14T11:00:00.000-08:00) puts TERROR R at 238.0 cfs — near its historical average at 102% of mean flow. Streamflow is a leading indicator of drought stress, sediment load, and dilution capacity: low flows concentrate pollutants and warm water temperatures, stressing aquatic life and, in surface-water-dependent systems, the source water quality for treatment plants.

Monitoring Network

EPA WQP

EPA's Water Quality Portal (WQP) aggregates monitoring data from federal, state, and tribal agencies. Kodiak Island Borough has moderate coverage with 12 active monitoring sites with 2,154 recent measurements on record. Predominant monitoring categories include physical and microbiological. More monitoring sites generally indicate greater scientific attention to local water conditions — and provide the baseline data that regulators use to set future impairment listings.

Editorial advisory

What the data suggests for Kodiak Island Borough

Water Verdict

Kodiak Island Borough, Alaska receives a poor water quality assessment with a grade of F and a score of 6.8 out of 100. The water supply has documented quality issues. Residents are strongly encouraged to use filtered or bottled water for drinking and to stay informed about utility improvement plans. Separately, EPA ATTAINS assessments track 1 water body in the county's watershed, none of which are currently listed as impaired under the Clean Water Act. At the most recent USGS reading, local streamflow was tracking near its historical mean (101.7%).

Violation Context

EPA SDWIS records for Kodiak Island Borough, Alaska show 74 health-based violations, indicating multiple instances where federal contaminant limits or treatment requirements were not met. At 543.1 violations per 100,000 people served, this rate is high and signals significant water quality management issues. For independent context, 2,154 water-quality monitoring results have been recorded across the county in the EPA Water Quality Portal over the past five years.

Consumer Guidance

Kodiak Island Borough has a Grade F compliance record with 74 health-based violations — among the highest levels in the country. Kodiak Island Borough's drinking-water compliance score is 6.8 out of 100. Residents are strongly advised to use a certified NSF 58 reverse-osmosis filter or bottled water for all drinking and cooking until violations are corrected. Contacting the Alaska Department of Environmental Quality or Health can expedite utility compliance action. With 12 active water-quality monitoring sites in Kodiak Island Borough, data coverage is strong. A pipeline streamflow snapshot from the TERROR R gauge is also available on this page.

Regional Context

Kodiak Island Borough has poorer water quality than the average county in Alaska. Its water score is 13 points lower than the state average, suggesting more challenges with contamination control or infrastructure than neighboring counties.

Advisory text summarizes county-level public records and is not a replacement for your utility's current Consumer Confidence Report or direct local notices.

Contaminants & Resources

Key issues flagged in Kodiak Island Borough's water environment

Official EPA Resources for Kodiak Island Borough

EPA How's My Waterway

Interactive watershed health data for Kodiak Island Borough

EPA ECHO: Drinking Water Systems

Search water utilities and violation records for Kodiak Island Borough

Consumer Confidence Reports (AK)

Annual water quality reports from utilities in Alaska

Clean Water Act §303(d)

Watershed Health

Impaired Water Bodies

0.0%

0 of 1 assessed

Mostly healthy

Top Impairment Causes

No specific impairment causes reported for the assessed water bodies in this county.

Source: EPA ATTAINS · Reporting cycle 2022

Impairment is determined under the Clean Water Act §303(d): a water body is impaired when it fails to meet state-defined quality standards for designated uses (drinking, recreation, aquatic life). Assessment coverage varies by state; counties without assessed water bodies are not shown.

Past 5 years

Water Quality Monitoring

Monitoring Sites

12

Active in the past 5 years

Measurements Recorded

2.2K

2,154 total readings

Most Measured

  • Physical
  • Microbiological
  • Inorganics, Minor, Metals

Categories measured most frequently

Data from the EPA Water Quality Portal (WQP), aggregating monitoring records from federal, state, and tribal sources. Each measurement represents a single sample analyzed for a specific characteristic (e.g., E. coli, pH, dissolved oxygen, nitrogen).

Live USGS Streamgage

River & Stream Conditions

Current Discharge

238cfs

May 14, 7:00 PM UTC

vs Long-Term Average

102%

Near typical

Primary Streamgage

TERROR R AT MOUTH NR KODIAK AK

USGS site
15295700
Drainage area
46.1 sq mi
Long-term mean
234 cfs

One representative streamgage (the one with the largest drainage area in the county). Many counties have multiple gauges; this view summarizes the primary one. The long-term mean is the full-record annual average; the percent-of-typical value compares the latest reading against that average.

Free tool

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Water Cost Estimate

3

3 people  ·  ~225 gal/day

Annual Total

$558

Monthly

$47

Water Bill

$558/yr

Filter Cost

$0/yr

Safety Grade for Kodiak Island Borough:C — Moderate

Some violations or watershed impairment detected.

Estimates use the national average residential water rate ($0.0068/gal, EPA/AWWA 2023) and EPA WaterSense per-person consumption baseline (75 gal/person/day). Actual bills vary by utility, usage tier, and local infrastructure fees. For informational purposes only.

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Frequently Asked Questions

What is the water quality in Kodiak Island Borough, Alaska?
Kodiak Island Borough, Alaska has a drinking-water quality grade of F with a score of 6.8/100, based on EPA SDWIS compliance data. The county has 74 health-based drinking water violations over the past 5 years. Watershed health, monitoring records, and streamflow snapshots are reported separately on this page.
Are there any water violations in Kodiak Island Borough?
Kodiak Island Borough has 74 health-based drinking water violations recorded by the EPA over the past 5 years. Health-based violations indicate instances where contaminant levels exceeded EPA Maximum Contaminant Levels (MCLs). Violations may have been resolved — check with your local water utility for current status.
How healthy are the watersheds in Kodiak Island Borough?
EPA ATTAINS assessments under Clean Water Act §303(d) indicate 0.0% of Kodiak Island Borough's 1 assessed water bodies are classified as impaired (0 impaired). Impairment means the water body fails to meet state quality standards for at least one designated use — drinking water source, recreation, aquatic life, or fish consumption. Note: watershed impairment doesn't always translate to tap-water issues; treatment plants can remove most regulated contaminants.
How much water-quality monitoring happens in Kodiak Island Borough?
EPA's Water Quality Portal records 2,154 measurements from 12 monitoring sites in Kodiak Island Borough over the past five years. The most frequently measured characteristic groups are Physical, Microbiological, Inorganics, Minor, Metals. Each measurement is a single sample analyzed for one characteristic (E. coli, pH, dissolved oxygen, etc.). High monitoring density means more scientific evidence behind any reported signal — it does not by itself indicate water quality.
What's happening with rivers in Kodiak Island Borough right now?
Kodiak Island Borough's primary USGS streamgage on the TERROR R has a pipeline snapshot of 238 cubic feet per second — 102% of the long-term mean of 233.97 cfs. Flow is within typical range for this gauge. For the latest gauge feed, visit waterdata.usgs.gov.
How does Kodiak Island Borough water compare to the Alaska average?
Kodiak Island Borough's SDWIS water quality score of 6.8/100 is lower than the Alaska state average of 19.8. The average water quality grade across Alaska is F, based on data from 22 counties with available SDWIS data.
Is tap water safe to drink in Kodiak Island Borough?
Based on EPA SDWIS data, Kodiak Island Borough has a water quality grade of F (6.8/100). This indicates below-average compliance with significant violations. Residents may want to consider home water filtration or independent testing. The grade speaks to the public water system, not the watershed — for watershed-level concerns, see the Watershed Health zone. For the most up-to-date information, contact your local water utility or review your Consumer Confidence Report (CCR).
Why does Kodiak Island Borough have so many water violations?
Kodiak Island Borough has 74 health-based drinking water violations on record from the EPA SDWIS database. A higher violation count can result from aging infrastructure, underfunded water utilities, agricultural runoff contamination, or industrial pollution. Counties with more water systems may also see more violations simply due to scale. Residents concerned about water quality should consider independent water testing and home filtration systems.
How does Kodiak Island Borough rank for water quality in Alaska?
Kodiak Island Borough ranks #13 out of 22 counties in Alaska by SDWIS water quality score (1 = best). With a score of 6.8/100, it falls in the middle third of counties statewide. The ranking reflects EPA SDWIS compliance only — not watershed impairment, monitoring density, or streamflow, which are tracked separately on this page.

Counties with Similar Water Quality

Dillingham Census Area

Alaska

F

6.2

Water score

Denali Borough

Alaska

F

8.3

Water score

Ketchikan Gateway Borough

Alaska

F

5.1

Water score

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.

Watershed health and impaired-waterway data from the EPA ATTAINS Clean Water Act §303(d) assessments, state-reported and EPA-finalized.

Water-quality monitoring counts from the EPA Water Quality Portal (WQP), federated USGS, EPA, and state agency sampling records over a rolling 5-year window.

Live streamflow from the USGS National Water Information System (NWIS), continuous discharge measurements from the largest-drainage gauge in each county, compared against the full-record long-term annual mean.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

By Evan Brooks, Data EditorUpdated Reviewed by Evan Brooks, Data Editor

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