Rockwall County Water Quality: 3 Cities Ranked by the Records

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

Rockwall County, Texas: 3 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 Rockwall 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.

Lead (90th percentile)Detected in 3 systems15 µg/L federal action level · US EPAHighest1.81 µg/L

CITY OF ROCKWALL1.81 µg/LMonitoring period: 2026–2026 (still open)
CITY OF ROYSE CITY1.8 µg/LMonitoring period: 2026–2026 (still open)
CITY OF FATE1.34 µg/LMonitoring period: 2024–2024

Perfluorobutanesulfonic acid (PFBS)Detected in 3 systems2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPAHighest5.5 ng/L

CITY OF FATE5.5 ng/LSample date: 2023-09-20 to 2024-06-12
CITY OF ROCKWALL4.4 ng/LSample date: 2024-12-11 to 2026-01-14
CITY OF ROYSE CITY4.1 ng/LSample date: 2024-05-21 to 2025-02-17

Perfluorohexanoic acid (PFHxA)Detected in 3 systems400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest7.5 ng/L

CITY OF FATE7.5 ng/LSample date: 2023-09-20 to 2024-06-12
CITY OF ROCKWALL6.3 ng/LSample date: 2024-12-11 to 2026-01-14
CITY OF ROYSE CITY5.6 ng/LSample date: 2024-05-21 to 2025-02-17

Perfluorobutanoic acid (PFBA)Detected in 3 systemsNo federal or state limit; shown for transparencyHighest11.9 ng/L

CITY OF FATE11.9 ng/LSample date: 2023-09-20 to 2024-06-12
CITY OF ROCKWALL9.6 ng/LSample date: 2024-12-11 to 2026-01-14
CITY OF ROYSE CITY7.5 ng/LSample date: 2024-05-21 to 2025-02-17

Perfluoropentanoic acid (PFPeA)Detected in 3 systemsNo federal or state limit; shown for transparencyHighest8.7 ng/L

CITY OF FATE8.7 ng/LSample date: 2023-09-20 to 2024-06-12
CITY OF ROCKWALL7 ng/LSample date: 2024-12-11 to 2026-01-14
CITY OF ROYSE CITY5.6 ng/LSample date: 2024-05-21 to 2025-02-17

26 substances tested, none detected in any systemShow

Tested in these 3 systems: CITY OF FATE, CITY OF ROCKWALL, CITY OF ROYSE CITY

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)
Lithium
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)
Perfluoroheptanoic acid (PFHpA)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorononanoic acid (PFNA)
Perfluorooctanesulfonic acid (PFOS)
Perfluorooctanoic acid (PFOA)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)

3 cities

Cities ranked by the records

1
RockwallCITY OF ROCKWALL
PFAS detected, within limitLead below action level
Open city report →
2
FateCITY OF FATE
PFAS detected, within limitLead below action level
Open city report →
3
Royse CityCITY OF ROYSE CITY
PFAS detected, within limitLead below action level
Open city report →

Showing 3 of 3 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 Rockwall CountyPFAS detected in 3 of 3 cities; none had a sample above a 2024 EPA limit

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

Lead

0of 3 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

Who supplies the county

Largest water systems

RockwallCITY OF ROCKWALL · TX1990001
55,250 served
FateCITY OF FATE · TX1990006
29,285 served
Royse CityCITY OF ROYSE CITY · TX1990002
24,313 served

Questions

Frequently asked

How does Rockwall County tap water compare across cities?

PurityMap ranks 3 cities in Rockwall 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 Rockwall's main water system: CITY OF ROCKWALL · PWSID TX1990001 · Purity Score 98 (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 Rockwall County cities had a PFAS sample above a 2024 EPA limit?

None of the 3 Rockwall County city reports had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 3.

Is there lead in Rockwall County tap water?

Utilities report lead as a 90th-percentile result from home taps. 3 of 3 Rockwall 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.

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