ZIP Code 77056 Water Quality

Texas · 496,383 people served · 135 water systems

Failing

ZIP code 77056 is in Texas and is a large city from a drinking-water-service perspective, with 496,383 people served by 135 EPA-registered public water systems. It corresponds to HOUSTON.

Within ZIP code 77056, the EPA Safe Drinking Water Information System (SDWIS) records 23 health-based violations during the past five years across 135 water systems serving this postal area. The grade of F reflects the aggregate compliance pattern, not the current daily water quality.

Last updated: 2026-05-18 · Source: EPA SDWIS

ZIP Code Location

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Cities in ZIP 77056

HOUSTON

Water Systems Serving 77056

NORTHWEST HARRIS COUNTY MUD 22

PWSID: TX1011745

3,156 served

CENTRAL HARRIS COUNTY REGIONAL WATER AUT

PWSID: TX1013429

0 served

FORT BEND COUNTY MUD 35

PWSID: TX0790433

6,297 served

HARRIS COUNTY MUD 418

PWSID: TX1013329

0 served

HARRIS COUNTY MUD 122

PWSID: TX1012391

1,158 served

RICEWOOD MUD

PWSID: TX1012227

4,989 served

BLUE RIDGE WEST MUD

PWSID: TX0790051

7,545 served

FORT BEND COUNTY MUD 34

PWSID: TX0790200

5,523 served

NORTHWEST HARRIS COUNTY MUD 15

PWSID: TX1011600

6,915 served

HARRIS COUNTY MUD 166

PWSID: TX1013181

4,239 served

HARRIS COUNTY MUD 389

PWSID: TX1013265

2,676 served

KIRKMONT MUD

PWSID: TX1010439

2,289 served

HARRIS COUNTY MUD 205

PWSID: TX1012704

1,560 served

HARRIS COUNTY WCID FONDREN ROAD

PWSID: TX1010249

3,144 served

HARRIS COUNTY MUD 36

PWSID: TX1012000

1,464 served

HARRIS COUNTY MUD 257

PWSID: TX1012985

3,501 served

LONGHORN TOWN UTILITY DISTRICT

PWSID: TX1012408

1,788 served

ADDICKS UTILITY DISTRICT

PWSID: TX1011019

7,017 served

GREEN TRAILS MUD

PWSID: TX1011839

2,982 served

HARRIS COUNTY MUD 400 - WEST

PWSID: TX1013310

5,217 served

HARRIS COUNTY MUD 400 - EAST

PWSID: TX1013416

6,066 served

HARRIS COUNTY MUD 281

PWSID: TX1013178

3,573 served

GRAND LAKES MUD 2

PWSID: TX0790387

2,076 served

HARRIS COUNTY MUD 399

PWSID: TX1013346

2,967 served

NORTHWEST HARRIS COUNTY MUD 32

PWSID: TX1013034

5,016 served

HARRIS COUNTY WCID 132

PWSID: TX1010413

3,501 served

HARRIS COUNTY MUD 44

PWSID: TX1010718

2,301 served

MONTGOMERY COUNTY MUD 42

PWSID: TX1700320

630 served

HARRIS COUNTY MUD 276

PWSID: TX1012942

5,094 served

JACKRABBIT ROAD PUD

PWSID: TX1010538

8,346 served

LANGHAM CREEK UTILITY DISTRICT

PWSID: TX1011249

10,377 served

NORTHGATE CROSSING MUD 1

PWSID: TX1013077

3,906 served

HARRIS COUNTY MUD 200 CRANBROOK

PWSID: TX1012007

14,868 served

HARRIS COUNTY MUD 280

PWSID: TX1013063

2,898 served

HARRIS COUNTY WCID 110

PWSID: TX1010482

9,807 served

HARRIS COUNTY MUD 130

PWSID: TX1012097

4,572 served

HARRIS-FORT BEND COUNTIES MUD 3

PWSID: TX1013365

9,297 served

HARRIS COUNTY MUD 370

PWSID: TX1013113

4,452 served

SAGEMEADOW UTILITY DISTRICT

PWSID: TX1010386

6,987 served

HARRIS COUNTY MUD 345

PWSID: TX1012768

3,855 served

HARRIS COUNTY MUD 53

PWSID: TX1010720

17,856 served

HARRIS COUNTY MUD 183

PWSID: TX1011824

3,981 served

MONTGOMERY COUNTY MUD 98

PWSID: TX1700746

2,766 served

MONTGOMERY COUNTY MUD 141

PWSID: TX1700866

978 served

MONTGOMERY COUNTY MUD 119 SPRING TRAILS

PWSID: TX1700773

6,621 served

HARRIS FORT BEND COUNTIES MUD 5

PWSID: TX0790347

4,641 served

FORT BEND COUNTY MUD 220

PWSID: TX0790573

1,812 served

HARRIS COUNTY MUD 387

PWSID: TX1013360

0 served

HARRIS COUNTY MUD 576

PWSID: TX1013742

822 served

HARRIS COUNTY MUD 239

PWSID: TX1012392

5,583 served

About ZIP-code water data

Postal-code level water quality data is built up from the underlying water systems — multiple ZIPs may share a single utility, and a single ZIP can span multiple utilities. For property-level information, contact the specific utility serving your address. EPA data on this page was last refreshed on 2026-05-18.