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City water profile

Thorne Bay water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Thorne Bay, Alaska.

Median indexed hardness

44PPM

One indexed ZIP

Range 44.4–44.4 PPM

State comparison
39 PPM below
State hardness rank
#16 of 17
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Thorne Bay has 1 published ZIP profile across Prince Of Wales-Hyder Census Area. The indexed median is 44 PPM, compared with 83 PPM across Alaska.

Among the 17 Alaskacities with an indexed median, Thorne Bay ranks #16from highest to lowest. Across all 149 state ZIP profiles, available estimates run from 36.7to 199 PPM.

Because only one ZIP is represented, the city median and range are the same local estimate. It should not be read as multiple independent samples across the community. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft1 ZIP
Moderately hard0 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

1 of 1 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
62.4 miles
Profiles with evidence
1/1

Confidence labels

High: 0Moderate: 0Low: 1

Observation window: Aug 23, 2017 to Jul 22, 2025.

ZIP directory

Water reports in Thorne Bay

Open a ZIP for site-level provenance and measurements.

ZIP code

99919

Soft

44.4 PPM

Nearest site
62.4 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Thorne Bay, City Of

PWSID AK2120216

Surface water
System population served
470
Last reported
Jun 19, 2026

The system names this served city; Census place overlap links the city to this ZCTA.

Compliance history

What EPA records show

No active health-based violation appears among the associated systems in the represented EPA reporting quarter. This does not mean every contaminant was tested at every tap.

RecordSystemPeriodStatus
Lead and Copper RuleAK2120216Jan 1, 2026Unaddressed
Lead and Copper RuleAK2120216Jul 1, 2025Unaddressed
TTHMAK2120216Apr 1, 2025Resolved
Interim Enhanced Surface Water Treatment RuleAK2120216Mar 1, 2025Resolved
Surface Water Treatment RuleAK2120216Mar 1, 2025Resolved
Interim Enhanced Surface Water Treatment RuleAK2120216Feb 1, 2025Resolved
Surface Water Treatment RuleAK2120216Feb 1, 2025Resolved
Surface Water Treatment RuleAK2120216Jan 1, 2025Resolved
Total Haloacetic Acids (HAA5)AK2120216Jan 1, 2025Resolved
Interim Enhanced Surface Water Treatment RuleAK2120216Jan 1, 2025Resolved

Practical next steps

Move from index to evidence

  1. 1. Open your ZIP. Check distance, dates, confidence, and the associated utility.
  2. 2. Read the current CCR. Confirm source water, detections, limits, ranges, and notices.
  3. 3. Test the tap when needed. Confirm health concerns or treatment sizing with the right method.

Questions people ask

About water in Thorne Bay

Is the water hard?

The indexed city median is 44 PPM. Open the ZIP report to verify the distance and confidence behind that estimate.

Is the tap water safe?

Compliance history is utility-wide and cannot guarantee conditions at every tap. Check current notices and test when address-specific evidence is needed.

Do I need treatment?

Choose treatment only after confirming the problem at the property. A softener targets hardness; contaminant treatment requires a matching, verified performance claim.