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City water profile

Oak Island water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Oak Island, North Carolina.

Median indexed hardness

99PPM

2 indexed ZIPs

Range 98.5–98.5 PPM

State comparison
58 PPM above
State hardness rank
#104 of 381
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Oak Island has 2 published ZIP profiles across Brunswick County. The indexed median is 99 PPM, compared with 41 PPM across North Carolina.

Among the 381 North Carolinacities with an indexed median, Oak Island ranks #104from highest to lowest. Across all 519 state ZIP profiles, available estimates run from 4.7to 267.5 PPM.

The 98.5–98.5 PPM range shows how much the available ZIP estimates vary within the city label. At least one estimate is marked low confidence, so observation distance and date deserve extra attention.

Hardness distribution

How local ZIP estimates compare

Soft0 ZIPs
Moderately hard2 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

2 of 2 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
16.5 miles
Profiles with evidence
2/2

Confidence labels

High: 0Moderate: 0Low: 2

Observation window: May 8, 2017 to May 9, 2017.

ZIP directory

Water reports in Oak Island

Open a ZIP for site-level provenance and measurements.

ZIP code

28422

Moderately Hard

98.5 PPM

Nearest site
16.5 mi
Confidence
Low

View full ZIP evidence →

ZIP code

28465

Moderately Hard

98.5 PPM

Nearest site
15.3 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

Oak Island, Town Of

PWSID NC0410020

Surface water
System population served
26,924
Last reported
Jun 26, 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.

No violation records are included in the current lookback window.

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 Oak Island

Is the water hard?

The indexed city median is 99 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.