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City water profile

Corpus Christi water quality

Compare local ZIP estimates, evidence quality, associated public systems, and compliance history for Corpus Christi, Texas.

Median indexed hardness

347PPM

19 indexed ZIPs

Range 241–439 PPM

State comparison
236 PPM above
State hardness rank
#28 of 523
Matched utilities
1
Active health records
0

City summary

What the indexed records say

Corpus Christi has 19 published ZIP profiles across Nueces County. The indexed median is 347 PPM, compared with 111 PPM across Texas.

Among the 523 Texascities with an indexed median, Corpus Christi ranks #28from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.

The 241–439 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 hard0 ZIPs
Hard0 ZIPs
Very hard18 ZIPs

18 of 19 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
61.9 miles
Profiles with evidence
18/19

Confidence labels

High: 0Moderate: 0Low: 18

Observation window: Feb 1, 2016 to Feb 10, 2016.

ZIP directory

Water reports in Corpus Christi

Open a ZIP for site-level provenance and measurements.

ZIP code

78373

Very Hard

347 PPM

Nearest site
67 mi
Confidence
Low

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ZIP code

78401

Very Hard

439 PPM

Nearest site
59.3 mi
Confidence
Low

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ZIP code

78402

Very Hard

347 PPM

Nearest site
55 mi
Confidence
Low

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ZIP code

78404

Very Hard

439 PPM

Nearest site
61.2 mi
Confidence
Low

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ZIP code

78405

Very Hard

439 PPM

Nearest site
60.2 mi
Confidence
Low

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ZIP code

78406

Very Hard

439 PPM

Nearest site
59.4 mi
Confidence
Low

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ZIP code

78407

Very Hard

439 PPM

Nearest site
57.8 mi
Confidence
Low

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ZIP code

78408

Very Hard

439 PPM

Nearest site
58.4 mi
Confidence
Low

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ZIP code

78409

Very Hard

347 PPM

Nearest site
55.7 mi
Confidence
Low

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ZIP code

78410

Very Hard

241 PPM

Nearest site
54.3 mi
Confidence
Low

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ZIP code

78411

Very Hard

347 PPM

Nearest site
64.1 mi
Confidence
Low

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ZIP code

78412

Very Hard

347 PPM

Nearest site
66.4 mi
Confidence
Low

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ZIP code

78413

Very Hard

347 PPM

Nearest site
66.8 mi
Confidence
Low

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ZIP code

78414

Very Hard

347 PPM

Nearest site
68.9 mi
Confidence
Low

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ZIP code

78415

Very Hard

347 PPM

Nearest site
67.3 mi
Confidence
Low

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ZIP code

78416

Very Hard

347 PPM

Nearest site
61.9 mi
Confidence
Low

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ZIP code

78417

Very Hard

347 PPM

Nearest site
62.3 mi
Confidence
Low

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ZIP code

78418

No estimate

—

Nearest site
— mi
Confidence
—

View full ZIP evidence →

ZIP code

78419

Very Hard

347 PPM

Nearest site
68.4 mi
Confidence
Low

View full ZIP evidence →

Public water systems

Utilities associated with this city

City Of Corpus Christi

PWSID TX1780003

Surface water
System population served
318,387
Last reported
Jun 26, 2026

A municipal system, in-state city, and served county all agree with this Census 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
Interim Enhanced Surface Water Treatment RuleTX1780003Feb 1, 2021Resolved · health-based
Interim Enhanced Surface Water Treatment RuleTX1780003Feb 1, 2021Resolved · health-based

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 Corpus Christi

Is the water hard?

The indexed city median is 347 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.