Updated 2026-10-15

County water report

Dallas County Water Quality: 16 Cities Ranked by the Records

Name: Dallas County Water Quality Data (2026)
Creator: PurityMap
License: https://creativecommons.org/licenses/by/4.0/

Dallas County, Texas: 16 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.

Find my system Open on the map Private wells in Dallas County

Across the county's systems

Highest result for each contaminant

One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.

Perfluorooctanesulfonic acid (PFOS)Detected in 6 systems of 16 tested4.0 ng/L federal MCL (2024) · US EPAHighest82 ng/L

CITY OF GRAND PRAIRIE82 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF SEAGOVILLE5.1 ng/LSample date: 2023-04-24 to 2024-06-12
DALLAS WATER UTILITY5.1 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF DUNCANVILLE4.4 ng/LSample date: 2023-05-09 to 2024-02-28
CITY OF BALCH SPRINGS4.2 ng/LSample date: 2024-07-15 to 2025-04-28
CITY OF IRVING4 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF CEDAR HILLNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELLNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-06-16
CITY OF DESOTONot detected · below 4.0 ng/L lab reporting limitSample date: 2023-08-14 to 2024-05-28
CITY OF GARLANDNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-23 to 2024-12-05
CITY OF LANCASTERNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-05-21
CITY OF MESQUITENot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-22 to 2025-11-03
CITY OF RICHARDSONNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-28 to 2025-01-27
CITY OF ROWLETTNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-02-17 to 2025-08-25
CITY OF SACHSENot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-12 to 2025-03-17
TOWN OF ADDISONNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-09-22

Perfluorooctanoic acid (PFOA)Detected in 3 systems of 16 tested4.0 ng/L federal MCL (2024) · US EPAHighest6.3 ng/L

DALLAS WATER UTILITY6.3 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF GRAND PRAIRIE4.9 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF IRVING4.9 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF BALCH SPRINGSNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-07-15 to 2025-04-28
CITY OF CEDAR HILLNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELLNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-06-16
CITY OF DESOTONot detected · below 4.0 ng/L lab reporting limitSample date: 2023-08-14 to 2024-05-28
CITY OF DUNCANVILLENot detected · below 4.0 ng/L lab reporting limitSample date: 2023-05-09 to 2024-02-28
CITY OF GARLANDNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-01-23 to 2024-12-05
CITY OF LANCASTERNot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-05-21
CITY OF MESQUITENot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-22 to 2025-11-03
CITY OF RICHARDSONNot detected · below 4.0 ng/L lab reporting limitSample date: 2024-02-28 to 2025-01-27
CITY OF ROWLETTNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-02-17 to 2025-08-25
CITY OF SACHSENot detected · below 4.0 ng/L lab reporting limitSample date: 2024-06-12 to 2025-03-17
CITY OF SEAGOVILLENot detected · below 4.0 ng/L lab reporting limitSample date: 2023-04-24 to 2024-06-12
TOWN OF ADDISONNot detected · below 4.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-09-22

LithiumDetected in 2 systems of 16 tested10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest12.1 µg/L

CITY OF GRAND PRAIRIE12.1 µg/LSample date: 2024-05-07 to 2025-02-03
CITY OF IRVING9.99 µg/LSample date: 2023-07-11 to 2024-04-08
CITY OF BALCH SPRINGSNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-07-15 to 2025-04-28
CITY OF CEDAR HILLNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-07-01 to 2025-04-01
CITY OF COPPELLNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-08-13 to 2025-05-05
CITY OF DESOTONot detected · below 9.0 µg/L lab reporting limitSample date: 2023-08-14 to 2024-05-28
CITY OF DUNCANVILLENot detected · below 9.0 µg/L lab reporting limitSample date: 2023-05-09 to 2024-02-28
CITY OF GARLANDNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-01-23 to 2024-10-10
CITY OF LANCASTERNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-04-17 to 2024-01-23
CITY OF MESQUITENot detected · below 9.0 µg/L lab reporting limitSample date: 2025-01-22 to 2025-11-03
CITY OF RICHARDSONNot detected · below 9.0 µg/L lab reporting limitSample date: 2024-02-28 to 2024-11-14
CITY OF ROWLETTNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-02-17 to 2025-11-17
CITY OF SACHSENot detected · below 9.0 µg/L lab reporting limitSample date: 2024-06-12 to 2025-03-17
CITY OF SEAGOVILLENot detected · below 9.0 µg/L lab reporting limitSample date: 2023-04-24 to 2024-01-23
DALLAS WATER UTILITYNot detected · below 9.0 µg/L lab reporting limitSample date: 2023-03-08 to 2024-01-08
TOWN OF ADDISONNot detected · below 9.0 µg/L lab reporting limitSample date: 2025-01-13 to 2025-10-27

Water hardnessDetected in 3 systemsAesthetic, no federal health limit · USGSHighest9.9 gpg

CITY OF GRAND PRAIRIE9.9 gpgReporting year: 2025
CITY OF GARLAND8.7 gpgReporting year: 2025
CITY OF MESQUITE8.7 gpgReporting year: 2025

Perfluorohexanesulfonic acid (PFHxS)Detected in 3 systems of 16 tested10 ng/L federal MCL (2024) · US EPAHighest3.8 ng/L

DALLAS WATER UTILITY3.8 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF GRAND PRAIRIE3.3 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF IRVING3 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF BALCH SPRINGSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-07-15 to 2025-04-28
CITY OF CEDAR HILLNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELLNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-06-16
CITY OF DESOTONot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-14 to 2024-05-28
CITY OF DUNCANVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-09 to 2024-02-28
CITY OF GARLANDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-23 to 2024-12-05
CITY OF LANCASTERNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-05-21
CITY OF MESQUITENot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-22 to 2025-11-03
CITY OF RICHARDSONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-28 to 2025-01-27
CITY OF ROWLETTNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-17 to 2025-08-25
CITY OF SACHSENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-12 to 2025-03-17
CITY OF SEAGOVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-24 to 2024-06-12
TOWN OF ADDISONNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-09-22

Haloacetic acids (HAA5)Detected in 2 systems60 ppb federal MCL · US EPAHighest20 ppb

CITY OF IRVING20 ppbReporting year: 2024
DALLAS WATER UTILITY17 ppbReporting year: 2024

CopperDetected in 1 system1.3 mg/L (action level) · US EPAHighest0.39 mg/L

DALLAS WATER UTILITY0.39 mg/LReporting year: 2024

Total trihalomethanes (TTHM)Detected in 2 systems80 ppb federal MCL · US EPAHighest19.1 ppb

DALLAS WATER UTILITY19.1 ppbReporting year: 2024
CITY OF IRVING18 ppbReporting year: 2024

8 more contaminants detectedShow

Lead (90th percentile)Detected in 9 systems of 16 tested15 µg/L federal action level · US EPAHighest2.6 µg/L

CITY OF ROWLETT2.6 µg/LMonitoring period: 2026–2026 (still open)
CITY OF RICHARDSON2.05 µg/LMonitoring period: 2026–2026 (still open)
TOWN OF ADDISON1.35 µg/LMonitoring period: 2023–2025
CITY OF GARLAND1.22 µg/LMonitoring period: 2025–2025
CITY OF GRAND PRAIRIE1.2 µg/LMonitoring period: 2022–2024
CITY OF DUNCANVILLE1.1 µg/LMonitoring period: 2021–2023
DALLAS WATER UTILITY1.09 µg/LMonitoring period: 2022–2024
CITY OF MESQUITE1.05 µg/LMonitoring period: 2026–2026 (still open)
CITY OF IRVING1 µg/LMonitoring period: 2022–2024
CITY OF BALCH SPRINGSNot detectedMonitoring period: 2021–2023
CITY OF CEDAR HILLNot detectedMonitoring period: 2023–2025
CITY OF COPPELLNot detectedMonitoring period: 2023–2025
CITY OF DESOTONot detectedMonitoring period: 2022–2024
CITY OF LANCASTERNot detectedMonitoring period: 2023–2025
CITY OF SACHSENot detectedMonitoring period: 2026–2026 (still open)
CITY OF SEAGOVILLENot detectedMonitoring period: 2023–2025

FluorideDetected in 1 system4.0 mg/L · US EPAHighest0.629 mg/L

DALLAS WATER UTILITY0.629 mg/LReporting year: 2024

NitrateDetected in 1 system10 mg/L · US EPAHighest0.834 mg/L

DALLAS WATER UTILITY0.834 mg/LReporting year: 2024

Perfluorobutanesulfonic acid (PFBS)Detected in 16 systems2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest7.6 ng/L

DALLAS WATER UTILITY7.6 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF LANCASTER6.2 ng/LSample date: 2023-04-17 to 2024-05-21
CITY OF GARLAND5.7 ng/LSample date: 2024-01-23 to 2024-12-05
CITY OF IRVING5.6 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF DUNCANVILLE5.5 ng/LSample date: 2023-05-09 to 2024-02-28
CITY OF RICHARDSON5.2 ng/LSample date: 2024-02-28 to 2025-01-27
CITY OF GRAND PRAIRIE5.1 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF SEAGOVILLE5.1 ng/LSample date: 2023-04-24 to 2024-06-12
TOWN OF ADDISON4.8 ng/LSample date: 2025-01-13 to 2025-09-22
CITY OF CEDAR HILL4.2 ng/LSample date: 2024-07-01 to 2025-10-06
CITY OF DESOTO4.2 ng/LSample date: 2023-08-14 to 2024-05-28
CITY OF MESQUITE4.2 ng/LSample date: 2025-01-22 to 2025-11-03
CITY OF SACHSE4.1 ng/LSample date: 2024-06-12 to 2025-03-17
CITY OF BALCH SPRINGS3.8 ng/LSample date: 2024-07-15 to 2025-04-28
CITY OF ROWLETT3.1 ng/LSample date: 2025-02-17 to 2025-08-25
CITY OF COPPELL3 ng/LSample date: 2024-08-13 to 2025-06-16

Perfluorohexanoic acid (PFHxA)Detected in 16 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest17.9 ng/L

DALLAS WATER UTILITY17.9 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF IRVING11.9 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF GRAND PRAIRIE11.5 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF GARLAND7.5 ng/LSample date: 2024-01-23 to 2024-12-05
CITY OF LANCASTER7.1 ng/LSample date: 2023-04-17 to 2024-05-21
CITY OF DUNCANVILLE6.7 ng/LSample date: 2023-05-09 to 2024-02-28
CITY OF RICHARDSON6.7 ng/LSample date: 2024-02-28 to 2025-01-27
TOWN OF ADDISON6.3 ng/LSample date: 2025-01-13 to 2025-09-22
CITY OF SEAGOVILLE6.1 ng/LSample date: 2023-04-24 to 2024-06-12
CITY OF MESQUITE5.7 ng/LSample date: 2025-01-22 to 2025-11-03
CITY OF SACHSE5.6 ng/LSample date: 2024-06-12 to 2025-03-17
CITY OF DESOTO5.4 ng/LSample date: 2023-08-14 to 2024-05-28
CITY OF BALCH SPRINGS5 ng/LSample date: 2024-07-15 to 2025-04-28
CITY OF CEDAR HILL4.8 ng/LSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELL4.8 ng/LSample date: 2024-08-13 to 2025-06-16
CITY OF ROWLETT4.1 ng/LSample date: 2025-02-17 to 2025-08-25

Perfluorobutanoic acid (PFBA)Detected in 16 systemsNo federal or state limit; shown for transparencyHighest16 ng/L

CITY OF DESOTO16 ng/LSample date: 2023-08-14 to 2024-05-28
CITY OF LANCASTER13.7 ng/LSample date: 2023-04-17 to 2024-05-21
DALLAS WATER UTILITY13.2 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF GRAND PRAIRIE12.2 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF SEAGOVILLE12.1 ng/LSample date: 2023-04-24 to 2024-06-12
CITY OF GARLAND12 ng/LSample date: 2024-01-23 to 2024-12-05
CITY OF IRVING11.8 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF DUNCANVILLE11.2 ng/LSample date: 2023-05-09 to 2024-02-28
CITY OF SACHSE10 ng/LSample date: 2024-06-12 to 2025-03-17
CITY OF RICHARDSON9.8 ng/LSample date: 2024-02-28 to 2025-01-27
CITY OF CEDAR HILL9.5 ng/LSample date: 2024-07-01 to 2025-10-06
CITY OF BALCH SPRINGS9.2 ng/LSample date: 2024-07-15 to 2025-04-28
TOWN OF ADDISON8.7 ng/LSample date: 2025-01-13 to 2025-09-22
CITY OF COPPELL8.6 ng/LSample date: 2024-08-13 to 2025-06-16
CITY OF MESQUITE6.2 ng/LSample date: 2025-01-22 to 2025-11-03
CITY OF ROWLETT5 ng/LSample date: 2025-02-17 to 2025-08-25

Perfluoroheptanoic acid (PFHpA)Detected in 3 systems of 16 testedNo federal or state limit; shown for transparencyHighest6 ng/L

DALLAS WATER UTILITY6 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF GRAND PRAIRIE3.6 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF IRVING3.2 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF BALCH SPRINGSNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-07-15 to 2025-04-28
CITY OF CEDAR HILLNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELLNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-08-13 to 2025-06-16
CITY OF DESOTONot detected · below 3.0 ng/L lab reporting limitSample date: 2023-08-14 to 2024-05-28
CITY OF DUNCANVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-05-09 to 2024-02-28
CITY OF GARLANDNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-01-23 to 2024-12-05
CITY OF LANCASTERNot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-17 to 2024-05-21
CITY OF MESQUITENot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-22 to 2025-11-03
CITY OF RICHARDSONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-02-28 to 2025-01-27
CITY OF ROWLETTNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-02-17 to 2025-08-25
CITY OF SACHSENot detected · below 3.0 ng/L lab reporting limitSample date: 2024-06-12 to 2025-03-17
CITY OF SEAGOVILLENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-24 to 2024-06-12
TOWN OF ADDISONNot detected · below 3.0 ng/L lab reporting limitSample date: 2025-01-13 to 2025-09-22

Perfluoropentanoic acid (PFPeA)Detected in 16 systemsNo federal or state limit; shown for transparencyHighest18.2 ng/L

DALLAS WATER UTILITY18.2 ng/LSample date: 2023-03-08 to 2024-01-08
CITY OF GRAND PRAIRIE11.7 ng/LSample date: 2024-05-07 to 2025-02-03
CITY OF IRVING11.7 ng/LSample date: 2023-07-11 to 2024-04-08
CITY OF GARLAND8.6 ng/LSample date: 2024-01-23 to 2024-12-05
CITY OF RICHARDSON8.2 ng/LSample date: 2024-02-28 to 2025-01-27
CITY OF LANCASTER7.6 ng/LSample date: 2023-04-17 to 2024-05-21
CITY OF DUNCANVILLE7.5 ng/LSample date: 2023-05-09 to 2024-02-28
TOWN OF ADDISON6.7 ng/LSample date: 2025-01-13 to 2025-09-22
CITY OF SEAGOVILLE6.3 ng/LSample date: 2023-04-24 to 2024-06-12
CITY OF DESOTO6 ng/LSample date: 2023-08-14 to 2024-05-28
CITY OF MESQUITE5.8 ng/LSample date: 2025-01-22 to 2025-11-03
CITY OF SACHSE5.6 ng/LSample date: 2024-06-12 to 2025-03-17
CITY OF CEDAR HILL5.1 ng/LSample date: 2024-07-01 to 2025-10-06
CITY OF COPPELL5 ng/LSample date: 2024-08-13 to 2025-06-16
CITY OF BALCH SPRINGS4.6 ng/LSample date: 2024-07-15 to 2025-04-28
CITY OF ROWLETT4.6 ng/LSample date: 2025-02-17 to 2025-08-25

21 PFAS tested, none detected in any systemShow

Tested in these 16 systems: CITY OF BALCH SPRINGS, CITY OF CEDAR HILL, CITY OF COPPELL, CITY OF DESOTO, CITY OF DUNCANVILLE, CITY OF GARLAND, CITY OF GRAND PRAIRIE, CITY OF IRVING, CITY OF LANCASTER, CITY OF MESQUITE, CITY OF RICHARDSON, CITY OF ROWLETT, CITY OF SACHSE, CITY OF SEAGOVILLE, DALLAS WATER UTILITY, TOWN OF ADDISON

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorodecanoic acid (PFDA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluorononanoic acid (PFNA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

16 cities

Cities ranked by the records

Showing 6 of 16 cities · scores are system-level, not tap tests

Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.

PFAS in Dallas County6 of 16 city reports had a PFAS sample above a 2024 EPA limit

Grand Prairie82 ng/L
Dallas5.1 ng/L
Seagoville5.1 ng/L
Duncanville4.4 ng/L
Balch Springs4.2 ng/L
Irving4 ng/L

4.0 ng/L federal MCL · PFOS, ng/LPFAS in Texas

Lead

0of 16 cities above the 15 µg/L action level

Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.

Lead in Texas

Hard water

3cities report hardness · hardest Grand Prairie, 9.9 gpg

3 of 3 are hard on the USGS scale. An aesthetic measure with no federal health limit.

Hard water explained

Who supplies the county

Largest water systems

DallasDALLAS WATER UTILITY · TX0570004
1,356,479 served
IrvingCITY OF IRVING · TX0570050
264,546 served
GarlandCITY OF GARLAND · TX0570010
248,822 served
Grand PrairieCITY OF GRAND PRAIRIE · TX0570048
201,843 served
MesquiteCITY OF MESQUITE · TX0570014
158,412 served
RichardsonCITY OF RICHARDSON · TX0570015
122,615 served
RowlettCITY OF ROWLETT · TX0570056
68,123 served
DeSotoCITY OF DESOTO · TX0570006
57,999 served
Cedar HillCITY OF CEDAR HILL · TX0570036
50,904 served
CoppellCITY OF COPPELL · TX0570040
43,193 served

Questions

Frequently asked

How does Dallas County tap water compare across cities?

PurityMap ranks 16 cities in Dallas County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is DeSoto's main water system: CITY OF DESOTO · PWSID TX0570006 · Purity Score 100 (Excellent) · Confidence: moderate · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.

How many Dallas County cities had a PFAS sample above a 2024 EPA limit?

6 of 16 Dallas County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Grand Prairie (PFOS 82 ng/L), Dallas (PFOA 6.3 ng/L), Seagoville (PFOS 5.1 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 16.

Is there lead in Dallas County tap water?

Utilities report lead as a 90th-percentile result from home taps. 9 of 16 Dallas County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.

Does Dallas County have hard water?

Hardness is published in utility water-quality reports for 3 Dallas County cities on record; the hardest is Grand Prairie at 9.9 grains per gallon. Hardness affects scale and appliances; it is not a health finding.

Next step

Follow Dallas County's water

Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.