Grayson County Water Quality: 3 Cities Ranked by the Records
Grayson County, Texas: 3 city reports built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
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.
LithiumDetected in 3 systems10 µg/L EPA health reference level (screening, not a legal limit) · US EPAHighest33.7 µg/L
- CITY OF VAN ALSTYNE33.7 µg/LSample date: 2023-04-11 to 2024-11-05
- CITY OF SHERMAN30.7 µg/LSample date: 2023-02-08 to 2023-11-20
- CITY OF DENISON20.1 µg/LSample date: 2024-05-07 to 2025-02-03
Lead (90th percentile)Detected in 2 systems of 3 tested15 µg/L federal action level · US EPAHighest1.82 µg/L
- CITY OF DENISON1.82 µg/LMonitoring period: 2023–2025
- CITY OF VAN ALSTYNE0.81 µg/LMonitoring period: 2025–2025
- CITY OF SHERMANNot detectedMonitoring period: 2023–2025
Perfluorohexanoic acid (PFHxA)Detected in 1 system of 3 tested400,000 ng/L Michigan EGLE state MCL (strictest US state) · Michigan EGLEHighest3.8 ng/L
- CITY OF SHERMAN3.8 ng/LSample date: 2023-02-08 to 2023-11-20
- CITY OF DENISONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2025-02-03
- CITY OF VAN ALSTYNENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-11 to 2024-08-21
Perfluorobutanoic acid (PFBA)Detected in 2 systems of 3 testedNo federal or state limit; shown for transparencyHighest10.3 ng/L
- CITY OF VAN ALSTYNE10.3 ng/LSample date: 2023-04-11 to 2024-08-21
- CITY OF SHERMAN8.3 ng/LSample date: 2023-02-08 to 2023-11-20
- CITY OF DENISONNot detected · below 5.0 ng/L lab reporting limitSample date: 2024-05-07 to 2025-02-03
Perfluoropentanoic acid (PFPeA)Detected in 1 system of 3 testedNo federal or state limit; shown for transparencyHighest3.8 ng/L
- CITY OF SHERMAN3.8 ng/LSample date: 2023-02-08 to 2023-11-20
- CITY OF DENISONNot detected · below 3.0 ng/L lab reporting limitSample date: 2024-05-07 to 2025-02-03
- CITY OF VAN ALSTYNENot detected · below 3.0 ng/L lab reporting limitSample date: 2023-04-11 to 2024-08-21
26 PFAS tested, none detected in any systemShow
Tested in these 3 systems: CITY OF DENISON, CITY OF SHERMAN, CITY OF VAN ALSTYNE
- 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)
- Perfluorobutanesulfonic acid (PFBS)
- 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)
Cities ranked by the records
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.
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 TexasLargest water systems
- ShermanCITY OF SHERMAN · TX091000643,645 served
- DenisonCITY OF DENISON · TX091000327,500 served
- Van AlstyneCITY OF VAN ALSTYNE · TX091000910,644 served
Frequently asked
How does Grayson County tap water compare across cities?
PurityMap ranks 3 cities in Grayson 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 Sherman's main water system: CITY OF SHERMAN · PWSID TX0910006 · 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 Grayson County cities had a PFAS sample above a 2024 EPA limit?
None of the 3 Grayson 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 2.
Is there lead in Grayson County tap water?
Utilities report lead as a 90th-percentile result from home taps. 2 of 3 Grayson 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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