Every Texas public water system that reported a PFAS detection during EPA UCMR 5 monitoring, how many sit above the 2024 federal limits, and the standard Texas applies. Concentrations are in nanograms per litre, the same unit as parts per trillion.
This is the United States view of the North American PFAS dataset. The complete dataset, including all 3,452 US systems and 97 Canadian sites, lives on the main PFAS contamination map.
Federal EPA limit applies
TCEQ follows federal MCL; extensive AFFF sites (Ellington, Lackland, Dyess).
Compound
Limit (ng/L)
Note
PFOA
4
PFOS
4
PFHxS
10
PFNA
10
HFPO-DA (GenX)
10
Mixture
Not numeric
Hazard Index ≤ 1 (PFHxS, PFNA, HFPO-DA, PFBS)
US EPA, PFAS National Primary Drinking Water Regulation (2024)
US EPA PFAS National Primary Drinking Water Regulation (2024)
Last reviewed 2026-08-13. Verify against the agency source before making a compliance or remediation decision.
Ranked by how far the worst single compound sits above its 2024 federal limit. Values are the maximum each system reported during its UCMR 5 monitoring period.
Water system
PWSID
Worst compound
Max ng/L
Times the limit
City Of Grand Prairie
TX0570048
PFOS
82
20.5x
Town Of Anthony
TX0710001
PFOS
33.1
8.3x
Hawley Wsc
TX1270006
PFOS
32.3
8.1x
City Of Abilene
TX2210001
PFOS
30
7.5x
City Of Boerne
TX1300001
PFOS
26.3
6.6x
Potosi Wsc
TX2210008
PFOS
21
5.3x
Dyess Air Force Base
TX2210013
PFOS
21
5.3x
City Of Tye
TX2210011
PFOS
20.4
5.1x
Eula Wsc
TX0300005
PFOS
20
5.0x
City Of Clyde
TX0300002
PFOS
15
3.8x
City Of Pflugerville
TX2270014
PFOS
14.4
3.6x
439 Wsc
TX0140076
PFOS
13.7
3.4x
Manville Wsc
TX2270033
PFOS
12.4
3.1x
Tanglewood On Texoma
TX0910052
PFHxS
28
2.8x
City Of Terrell
TX1290006
PFOS
10.4
2.6x
City Of Fort Worth
TX2200012
PFHxS
25.8
2.6x
City Of Dublin
TX0720001
PFOS
9.8
2.5x
Spencer Road Pud
TX1010654
PFOS
9.7
2.4x
Brownsville Public Utilities Board
TX0310001
PFOS
9.2
2.3x
City Of Huntsville
TX2360001
PFOS
8.9
2.2x
Open the full map and filter Texas pins
Every count above is read straight from a published government file. Nothing is modelled, averaged, or estimated. The rules below are the exact rules used to produce the figures for Texas.
Who is in UCMR 5. All public water systems serving more than 3,300 people, plus a national sample of 800 smaller systems. Private wells and most small systems are not monitored, so they cannot appear here.
Which systems are listed. Only systems whose state field is TX and that reported at least one measured PFAS detection. Systems that monitored and found nothing are not shown, and their absence is not evidence of contamination. That gives 607 systems in Texas.
Systems that cannot be placed. 87 systems nationally reported a detection but have no serviced ZIP code published by EPA, so they carry no location and are excluded from these counts. National totals on the map page include them.
Which value is used. The highest result a system reported for each compound across its sampling events. Results flagged by EPA as non-detects are excluded, as are the lithium results carried in the same file.
The above a limit count. A system is counted when its maximum result for a compound exceeds the 2024 federal Maximum Contaminant Level: 4 ng/L for PFOA and PFOS, 10 ng/L for PFHxS, PFNA, and HFPO-DA. That is 102 systems in Texas.
The Hazard Index count. Calculated with EPA's own mixture method for PFHxS, PFNA, HFPO-DA, and PFBS. A system is counted when the index is above 1. That is 22 systems in Texas.
What monitoring data is not. Exceeding a 2024 limit in this dataset is not a compliance violation. The federal limits carry a 2029 compliance date, which EPA proposed on 18 May 2026 to move to 2031 for PFOA and PFOS in a rule that is not final, and treatment may have been installed since the sample was taken.
If any figure on this page does not match its source file, tell Nelson and it will be corrected or removed.
Contact
Project inquiries, technical consultation, or emergencies.
We respond to project inquiries within one business day.
Nelson Environmental Remediation
Head Office
30541 - 100 Avenue
Acheson (Edmonton), Alberta
Canada T7X 6L8
Phone
Toll Free: 1.888.960.8222
Fax
1.780.962.6885