waterbycounty
Compiled federal source snapshot

Texas Water Quality

Drinking water data for all 221 counties.

Avg SDWIS Compliance Index

30.2

Most Common Five-Year SDWIS Compliance Band

F

Counties with Data

221

of 221 total

County water atlas

Texas water signals by county

A state-level 2.5D view across drinking-water compliance, watershed impairment, monitoring density, and streamflow snapshot context. Pin any county, switch layers, then use the lens controls to compare index ranges, recorded violation rates, or impaired watersheds without leaving the page.

Counties

221

Avg SDWIS index

30.2

Watersheds

0

ATTAINS counties

Monitoring

221

157 fresh USGS snapshots

State atlas layers combine EPA SDWIS health-based violations, EPA ATTAINS 303(d) impairment assessments, EPA Water Quality Portal monitoring sites, and representative USGS NWIS streamflow gauges. Streamflow values appear only for fresh pipeline snapshots, not as a continuously updated stream. County pages include the observation time and year.

Prepared by ByCounty Editorial TeamPublished by WaterByCounty

Multi-source coverage in Texas

Beyond Drinking Water

EPA SDWIS

221/ 221

counties with drinking-water compliance data

5,797 health violations statewide (5yr)

EPA ATTAINS

—

No §303(d) assessments yet for Texas

EPA WQP

3,617

monitoring sites across 221 counties

1,494,656 total readings (5yr window)

USGS NWIS

157

counties with a fresh pipeline snapshot

13 above141 below

State atlas notes

What stands out in Texas

County water quality is not one number. The strongest read comes from comparing drinking-water compliance against watershed impairment, monitoring density, and streamflow context. Use these signals as a starting point, then open any county profile for source-level detail.

Compliance spread

Baylor County has the highest value in the published state SDWIS Compliance Index table at 86.2/100, while Foard County has the lowest at 0.0/100. That is a 86.2 point gap inside one state.

Zero health violations

10

3+ health violations

177

Monitoring hubs

Harris County305 sitesGalveston County191 sitesBexar County123 sites

Lowest flow reads

Archer County0%Armstrong County0%Atascosa County0%

Highest fresh streamflow pipeline snapshots: Kerr County (1020%, observation 2026), Live Oak County (718%, observation 2026), McMullen County (602%, observation 2026). These are source-data observations, not household tap-water conclusions.

All Texas Counties

CountySDWIS Compliance Index
Baylor County86.2
Crockett County86.2
Franklin County86.2
Hemphill County86.2
Lavaca County86.2
Menard County86.2
Roberts County86.2
Robertson County86.2
Sterling County86.2
Titus County86.2
Dallas County71.9
Potter County71.2
Collin County70.7
Bexar County69.8
Fort Bend County68.8
Tarrant County67.8
Maverick County66.3
Denton County66.1
Bell County65.6
Harris County65.6
Rockwall County65.4
Williamson County65.1
Hidalgo County64.8
Ellis County63.6
Travis County63.3
Wood County63.1
El Paso County62.9
Wichita County62.3
Guadalupe County61.9
Galveston County61.6
Bowie County59.8
Brown County59.8
Brazos County58.9
Kaufman County58.0
Wilson County57.8
DeWitt County56.7
Nueces County56.5
Cameron County55.4
Taylor County54.9
Hays County54.7
Lamar County54.3
Van Zandt County53.5
Upshur County52.9
Johnson County52.7
Bastrop County51.6
Gonzales County51.4
Hopkins County51.0
Atascosa County50.8
Ward County50.7
Zavala County50.5
Fannin County50.1
Nacogdoches County49.9
Hunt County49.7
Gray County49.3
Moore County48.7
Archer County48.4
Camp County48.3
Gregg County47.1
Medina County47.1
Live Oak County46.7
Liberty County45.8
Montgomery County44.7
Hardin County44.2
San Saba County44.2
Colorado County43.5
Wharton County43.4
Lee County43.2
Anderson County42.2
Webb County41.5
Grayson County41.2
Hutchinson County40.3
Jefferson County40.3
Young County39.5
Morris County38.0
Frio County37.9
Cooke County37.3
Hood County37.0
Tom Green County37.0
Hansford County36.4
Ochiltree County36.2
Waller County35.9
Nolan County35.7
Mitchell County35.6
Uvalde County33.9
Stephens County33.6
Austin County32.3
Freestone County31.8
Coryell County31.7
Scurry County31.0
Jackson County30.5
Hill County30.0
Smith County30.0
Caldwell County29.4
Comal County29.3
Llano County29.0
San Patricio County28.8
Goliad County28.4
Val Verde County28.1
Karnes County27.8
Madison County26.6
Bosque County26.5
Navarro County26.5
Leon County26.3
Newton County26.3
Delta County26.0
La Salle County26.0
Starr County25.8
Red River County25.7
Dimmit County25.6
Sherman County25.4
Kleberg County25.3
Walker County24.7
Bandera County24.5
McLennan County24.3
Hudspeth County23.9
Montague County23.8
Brazoria County23.6
Carson County23.5
Henderson County23.2
Milam County22.9
Reeves County22.6
Erath County22.1
Willacy County21.5
Lampasas County21.3
Oldham County20.7
Washington County20.6
Victoria County19.4
Aransas County19.3
Harrison County18.8
Armstrong County18.4
Coleman County18.3
Jeff Davis County18.3
Brewster County18.2
Wheeler County17.8
Parker County17.7
Kendall County17.2
Bee County17.1
Randall County16.7
Lipscomb County16.3
Crosby County15.4
Howard County15.2
Fayette County14.2
Tyler County14.2
Zapata County14.1
Houston County14.0
Jack County13.9
Mills County13.9
Chambers County13.5
Burleson County13.3
Donley County13.0
Rusk County12.9
Angelina County12.8
Irion County12.6
Wise County12.3
Cass County12.0
Palo Pinto County11.7
Childress County11.5
San Jacinto County11.3
Blanco County11.1
Collingsworth County11.1
Terrell County11.1
Jim Wells County10.8
Jasper County10.5
Castro County10.3
Throckmorton County10.3
Jones County10.2
Gillespie County10.1
Hamilton County10.0
Orange County9.8
Clay County9.6
Kerr County9.4
Pecos County9.3
Hartley County9.2
Cherokee County9.0
Garza County9.0
Cottle County8.6
Haskell County8.1
Lubbock County8.1
Eastland County7.9
Marion County7.9
Polk County7.4
Sabine County7.3
Refugio County7.1
Limestone County7.0
Mason County6.8
Dallam County6.4
Grimes County6.4
Matagorda County6.4
Calhoun County6.3
Somervell County6.3
Rains County6.1
Panola County5.7
Runnels County5.7
Shelby County5.4
Shackelford County5.2
McMullen County5.0
Trinity County4.7
Comanche County4.6
Falls County4.4
Kenedy County4.0
Kimble County3.9
Wilbarger County3.9
Fisher County3.7
Knox County3.5
Presidio County3.0
Burnet County2.3
Loving County2.2
Coke County2.0
Real County2.0
Hardeman County1.9
Hall County1.0
Concho County0.9
Kent County0.6
King County0.5
McCulloch County0.3
San Augustine County0.2
Stonewall County0.2
Briscoe County0.1
Edwards County0.1
Borden County0.0
Foard County0.0

Frequently Asked Questions

Which Texas county has the highest SDWIS Compliance Index?
Baylor County has the highest SDWIS Compliance Index in the published Texas cohort at 86.2/100. This WaterByCounty relative comparison is not an EPA score and does not establish current conditions for a utility or address.
What does the Five-Year SDWIS Compliance Band mean?
The band is derived only from each county aggregation's recorded health-violation rate per 100,000 people served for the stated five-year source window. It is separate from the relative SDWIS Compliance Index and is not a current determination for a specific utility or address.
Which USGS streamflow records are shown across Texas?
WaterByCounty has 157 fresh USGS pipeline snapshots in the published Texas cohort. Each county page shows its observation timestamp and year. A pipeline snapshot is not a continuously updated reading or a tap-water safety measure.
Where can Texas residents find current official information?
Review the applicable utility's Consumer Confidence Report, active notices, and the state drinking-water agency. WaterByCounty's county-level historical aggregations do not establish the current status of a specific utility, address, private well, or household plumbing system.
What does Water Quality Portal monitoring volume show in Texas?
The published county records contain 1,494,656 results from 3,617 monitoring locations in the site's five-year aggregation. Monitoring volume does not by itself indicate better or worse water quality.

Data Sources

Drinking-water compliance data from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. The WaterByCounty SDWIS Compliance Index reflects the recorded rate and is not an EPA score.

Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.

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