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City water profile

Houston water quality

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

Median indexed hardness

72PPM

104 indexed ZIPs

Range 67.3–76.2 PPM

State comparison
39 PPM below
State hardness rank
#439 of 523
Matched utilities
3
Active health records
0

City summary

What the indexed records say

Houston has 104 published ZIP profiles across Harris County. The indexed median is 72 PPM, compared with 111 PPM across Texas.

Among the 523 Texascities with an indexed median, Houston ranks #439from highest to lowest. Across all 1,026 state ZIP profiles, available estimates run from 5.4to 500.5 PPM.

The 67.3–76.2 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 hard104 ZIPs
Hard0 ZIPs
Very hard0 ZIPs

104 of 104 ZIP profiles have a hardness estimate. Bars count ZIP profiles, not households or laboratory samples.

Evidence quality

Distance, dates, and confidence

Median nearest distance
15.5 miles
Profiles with evidence
104/104

Confidence labels

High: 0Moderate: 98Low: 6

Observation window: Jan 14, 2016 to May 19, 2026.

ZIP directory

Water reports in Houston

Open a ZIP for site-level provenance and measurements.

ZIP code

77002

Moderately Hard

76.2 PPM

Nearest site
13.7 mi
Confidence
Moderate

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ZIP code

77003

Moderately Hard

76.2 PPM

Nearest site
12.9 mi
Confidence
Moderate

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ZIP code

77004

Moderately Hard

76.2 PPM

Nearest site
14.9 mi
Confidence
Moderate

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ZIP code

77006

Moderately Hard

76.2 PPM

Nearest site
15.6 mi
Confidence
Moderate

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ZIP code

77007

Moderately Hard

76.2 PPM

Nearest site
15.6 mi
Confidence
Moderate

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ZIP code

77008

Moderately Hard

76.2 PPM

Nearest site
15.5 mi
Confidence
Moderate

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ZIP code

77009

Moderately Hard

76.2 PPM

Nearest site
12.7 mi
Confidence
Moderate

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ZIP code

77010

Moderately Hard

76.2 PPM

Nearest site
13.5 mi
Confidence
Moderate

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ZIP code

77011

Moderately Hard

76.2 PPM

Nearest site
11.4 mi
Confidence
Moderate

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ZIP code

77012

Moderately Hard

76.2 PPM

Nearest site
11.4 mi
Confidence
Moderate

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ZIP code

77013

Moderately Hard

76.2 PPM

Nearest site
5.8 mi
Confidence
Moderate

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ZIP code

77014

Moderately Hard

71.8 PPM

Nearest site
9 mi
Confidence
Moderate

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ZIP code

77015

Moderately Hard

76.2 PPM

Nearest site
5.8 mi
Confidence
Moderate

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ZIP code

77016

Moderately Hard

76.2 PPM

Nearest site
7.9 mi
Confidence
Moderate

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ZIP code

77017

Moderately Hard

76.2 PPM

Nearest site
11.8 mi
Confidence
Moderate

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ZIP code

77018

Moderately Hard

76.2 PPM

Nearest site
15.7 mi
Confidence
Moderate

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ZIP code

77019

Moderately Hard

76.2 PPM

Nearest site
16.3 mi
Confidence
Moderate

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ZIP code

77020

Moderately Hard

76.2 PPM

Nearest site
10.4 mi
Confidence
Moderate

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ZIP code

77021

Moderately Hard

76.2 PPM

Nearest site
15.7 mi
Confidence
Moderate

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ZIP code

77022

Moderately Hard

76.2 PPM

Nearest site
12.9 mi
Confidence
Moderate

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ZIP code

77023

Moderately Hard

76.2 PPM

Nearest site
12.9 mi
Confidence
Moderate

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ZIP code

77024

Moderately Hard

76.2 PPM

Nearest site
21.2 mi
Confidence
Moderate

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ZIP code

77025

Moderately Hard

71.8 PPM

Nearest site
19.9 mi
Confidence
Moderate

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ZIP code

77026

Moderately Hard

76.2 PPM

Nearest site
10.4 mi
Confidence
Moderate

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ZIP code

77027

Moderately Hard

76.2 PPM

Nearest site
18.6 mi
Confidence
Moderate

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ZIP code

77028

Moderately Hard

76.2 PPM

Nearest site
7.5 mi
Confidence
Moderate

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ZIP code

77029

Moderately Hard

76.2 PPM

Nearest site
8.5 mi
Confidence
Moderate

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ZIP code

77030

Moderately Hard

76.2 PPM

Nearest site
17.5 mi
Confidence
Moderate

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ZIP code

77031

Moderately Hard

71.8 PPM

Nearest site
21 mi
Confidence
Moderate

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ZIP code

77032

Moderately Hard

76.2 PPM

Nearest site
6 mi
Confidence
Moderate

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ZIP code

77033

Moderately Hard

71.8 PPM

Nearest site
16.5 mi
Confidence
Moderate

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ZIP code

77034

Moderately Hard

71.8 PPM

Nearest site
12.8 mi
Confidence
Moderate

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ZIP code

77035

Moderately Hard

71.8 PPM

Nearest site
22.2 mi
Confidence
Moderate

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ZIP code

77036

Moderately Hard

71.8 PPM

Nearest site
24.3 mi
Confidence
Moderate

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ZIP code

77037

Moderately Hard

76.2 PPM

Nearest site
12.3 mi
Confidence
Moderate

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ZIP code

77038

Moderately Hard

76.2 PPM

Nearest site
13.2 mi
Confidence
Moderate

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ZIP code

77040

Moderately Hard

71.8 PPM

Nearest site
17.2 mi
Confidence
Moderate

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ZIP code

77041

Moderately Hard

71.8 PPM

Nearest site
19.6 mi
Confidence
Moderate

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ZIP code

77042

Moderately Hard

67.3 PPM

Nearest site
24.9 mi
Confidence
Moderate

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ZIP code

77043

Moderately Hard

71.8 PPM

Nearest site
22.5 mi
Confidence
Moderate

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ZIP code

77044

Moderately Hard

76.2 PPM

Nearest site
2.4 mi
Confidence
Moderate

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ZIP code

77045

Moderately Hard

71.8 PPM

Nearest site
21.5 mi
Confidence
Moderate

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ZIP code

77046

Moderately Hard

76.2 PPM

Nearest site
18 mi
Confidence
Moderate

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ZIP code

77047

Moderately Hard

71.8 PPM

Nearest site
21.4 mi
Confidence
Moderate

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ZIP code

77048

Moderately Hard

71.8 PPM

Nearest site
18.2 mi
Confidence
Moderate

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ZIP code

77050

Moderately Hard

76.2 PPM

Nearest site
6.6 mi
Confidence
Moderate

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ZIP code

77051

Moderately Hard

71.8 PPM

Nearest site
18.7 mi
Confidence
Moderate

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ZIP code

77054

Moderately Hard

71.8 PPM

Nearest site
18.7 mi
Confidence
Moderate

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ZIP code

77055

Moderately Hard

76.2 PPM

Nearest site
19.9 mi
Confidence
Moderate

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ZIP code

77056

Moderately Hard

76.2 PPM

Nearest site
19.6 mi
Confidence
Moderate

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ZIP code

77057

Moderately Hard

76.2 PPM

Nearest site
20.8 mi
Confidence
Moderate

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ZIP code

77058

Moderately Hard

71.8 PPM

Nearest site
14.4 mi
Confidence
Moderate

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ZIP code

77059

Moderately Hard

71.8 PPM

Nearest site
11 mi
Confidence
Moderate

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ZIP code

77060

Moderately Hard

76.2 PPM

Nearest site
10.5 mi
Confidence
Moderate

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ZIP code

77061

Moderately Hard

71.8 PPM

Nearest site
14.7 mi
Confidence
Moderate

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ZIP code

77062

Moderately Hard

71.8 PPM

Nearest site
13.8 mi
Confidence
Moderate

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ZIP code

77063

Moderately Hard

71.8 PPM

Nearest site
22.8 mi
Confidence
Moderate

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ZIP code

77064

Moderately Hard

71.8 PPM

Nearest site
14.3 mi
Confidence
Moderate

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ZIP code

77065

Moderately Hard

71.8 PPM

Nearest site
16.2 mi
Confidence
Moderate

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ZIP code

77066

Moderately Hard

71.8 PPM

Nearest site
11.3 mi
Confidence
Moderate

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ZIP code

77067

Moderately Hard

71.8 PPM

Nearest site
10.9 mi
Confidence
Moderate

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ZIP code

77068

Moderately Hard

71.8 PPM

Nearest site
7.8 mi
Confidence
Moderate

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ZIP code

77069

Moderately Hard

71.8 PPM

Nearest site
9.9 mi
Confidence
Moderate

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ZIP code

77070

Moderately Hard

71.8 PPM

Nearest site
12.2 mi
Confidence
Moderate

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ZIP code

77071

Moderately Hard

71.8 PPM

Nearest site
21.2 mi
Confidence
Moderate

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ZIP code

77072

Moderately Hard

71.8 PPM

Nearest site
24.2 mi
Confidence
Moderate

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ZIP code

77073

Moderately Hard

76.2 PPM

Nearest site
7.9 mi
Confidence
Moderate

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ZIP code

77074

Moderately Hard

71.8 PPM

Nearest site
23.7 mi
Confidence
Moderate

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ZIP code

77075

Moderately Hard

71.8 PPM

Nearest site
15.5 mi
Confidence
Moderate

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ZIP code

77076

Moderately Hard

76.2 PPM

Nearest site
12.9 mi
Confidence
Moderate

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ZIP code

77077

Moderately Hard

67.3 PPM

Nearest site
27.6 mi
Confidence
Low

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ZIP code

77078

Moderately Hard

76.2 PPM

Nearest site
4.7 mi
Confidence
Moderate

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ZIP code

77079

Moderately Hard

67.3 PPM

Nearest site
25.1 mi
Confidence
Low

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ZIP code

77080

Moderately Hard

71.8 PPM

Nearest site
20.8 mi
Confidence
Moderate

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ZIP code

77081

Moderately Hard

71.8 PPM

Nearest site
21.1 mi
Confidence
Moderate

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ZIP code

77082

Moderately Hard

67.3 PPM

Nearest site
26.1 mi
Confidence
Low

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ZIP code

77084

Moderately Hard

71.8 PPM

Nearest site
23.7 mi
Confidence
Moderate

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ZIP code

77085

Moderately Hard

67.3 PPM

Nearest site
19.6 mi
Confidence
Moderate

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ZIP code

77086

Moderately Hard

71.8 PPM

Nearest site
13.6 mi
Confidence
Moderate

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ZIP code

77087

Moderately Hard

76.2 PPM

Nearest site
14.2 mi
Confidence
Moderate

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ZIP code

77088

Moderately Hard

76.2 PPM

Nearest site
15.4 mi
Confidence
Moderate

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ZIP code

77089

Moderately Hard

71.8 PPM

Nearest site
15.5 mi
Confidence
Moderate

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ZIP code

77090

Moderately Hard

71.8 PPM

Nearest site
7 mi
Confidence
Moderate

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ZIP code

77091

Moderately Hard

76.2 PPM

Nearest site
16.1 mi
Confidence
Moderate

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ZIP code

77092

Moderately Hard

76.2 PPM

Nearest site
18.5 mi
Confidence
Moderate

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ZIP code

77093

Moderately Hard

76.2 PPM

Nearest site
10.5 mi
Confidence
Moderate

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ZIP code

77094

Moderately Hard

67.3 PPM

Nearest site
28.2 mi
Confidence
Low

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ZIP code

77095

Moderately Hard

71.8 PPM

Nearest site
19.2 mi
Confidence
Moderate

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ZIP code

77096

Moderately Hard

71.8 PPM

Nearest site
22.5 mi
Confidence
Moderate

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ZIP code

77098

Moderately Hard

76.2 PPM

Nearest site
17.1 mi
Confidence
Moderate

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ZIP code

77099

Moderately Hard

71.8 PPM

Nearest site
22.2 mi
Confidence
Moderate

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ZIP code

77204

Moderately Hard

76.2 PPM

Nearest site
14.1 mi
Confidence
Moderate

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ZIP code

77336

Moderately Hard

76.2 PPM

Nearest site
1.1 mi
Confidence
Moderate

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ZIP code

77338

Moderately Hard

76.2 PPM

Nearest site
1.7 mi
Confidence
Moderate

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ZIP code

77339

Moderately Hard

76.2 PPM

Nearest site
2.6 mi
Confidence
Moderate

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ZIP code

77345

Moderately Hard

76.2 PPM

Nearest site
3.5 mi
Confidence
Moderate

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ZIP code

77379

Moderately Hard

71.8 PPM

Nearest site
7.6 mi
Confidence
Moderate

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ZIP code

77388

Moderately Hard

71.8 PPM

Nearest site
3.8 mi
Confidence
Moderate

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ZIP code

77396

Moderately Hard

76.2 PPM

Nearest site
5.7 mi
Confidence
Moderate

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ZIP code

77429

Moderately Hard

71.8 PPM

Nearest site
15.8 mi
Confidence
Moderate

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ZIP code

77433

Moderately Hard

71.8 PPM

Nearest site
21.5 mi
Confidence
Moderate

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ZIP code

77447

Moderately Hard

71.8 PPM

Nearest site
23.5 mi
Confidence
Moderate

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ZIP code

77449

Moderately Hard

67.3 PPM

Nearest site
26 mi
Confidence
Low

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ZIP code

77450

Moderately Hard

67.3 PPM

Nearest site
29 mi
Confidence
Low

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Public water systems

Utilities associated with this city

City Of Houston

PWSID TX1010013

Surface water
System population served
2,970,543
Last reported
Jun 26, 2026

A municipal system, in-state city, and served county all agree with this Census ZCTA.

City Of Houston Ud 5 - Kingwood

PWSID TX1010348

Groundwater
System population served
80,073
Last reported
Jun 26, 2026

A municipal system, in-state city, and served county all agree with this Census ZCTA.

City Of Houston Willow Chase

PWSID TX1011902

Groundwater
System population served
14,169
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 RuleTX1010013May 1, 2025Resolved · 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 Houston

Is the water hard?

The indexed city median is 72 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.