UCMR 5 PFAS results in Texas, by distance from your office
101 of 1,154 Texas water systems in EPA's UCMR 5 file measured PFOA or PFOS above 4.0 ppt in at least one sample. Type your office ZIP to see the ones near you, with sample point, date and the EPA record.
What UCMR 5 is
EPA's fifth Unregulated Contaminant Monitoring Rule sampled every public water system serving more than 3,300 people, plus a representative 800 smaller ones, from 2023 to 2025 (EPA). The data is final.
Nationally, 1,711 of 10,313 systems had a PFOA or PFOS result above 4.0 ppt. In Texas the figure is 101 of 1,154. The file was last modified Oct 15, 2026.
How to read a row
- Highest single result: the largest PFOA or PFOS value for that system, with its date.
- Sample point: where it was taken, named as EPA lists it.
- Next result at that point: so one high sample isn't read as a trend.
- Primary source from SDWIS: whether the system buys its water.
Rows from the Dallas sample
- 29 mi
CITY OF TERRELLTX1290006
CITY OF TERRELL (TX1290006): highest single UCMR 5 result 10.4 ppt PFOS on Sep 20, 2023, at sample point Entry Point to Dist. System (EP001), North Texas MWD Intertie; 3 of 8 PFOA/PFOS results were above 4.0 ppt. The next sample at that point (Oct 26, 2023) was 8.9 ppt. SDWIS lists its primary source as surface water purchased.
10.4 pptHighest single PFOS result - 27 mi
CITY OF HALTOM CITYTX2200014
CITY OF HALTOM CITY (TX2200014): highest single UCMR 5 result 7.7 ppt PFOS on Jun 26, 2023, at sample point Hollis Vault (EP002), Fort Worth Hollis Purchase; 7 of 16 PFOA/PFOS results were above 4.0 ppt. The next sample at that point (Sep 21, 2023) was 5.4 ppt. SDWIS lists its primary source as surface water purchased.
7.7 pptHighest single PFOS result - 47 mi
MACBEE SUDTX2340012
MACBEE SUD (TX2340012): highest single UCMR 5 result 5.1 ppt PFOS on May 5, 2025, at sample point MACBEE WTP LAB SINK (TRTTAP), MACBEE SUD; 1 of 8 PFOA/PFOS results were above 4.0 ppt.
5.1 pptHighest single PFOS resultEPA UCMR 5 Data Finder On TWDB list: MacBee SUD (PIF 17377)
Rows from the Dallas sample (75201 + 100 mi), engine run of Nov 7, 2026. In the tool each row also shows the administrator on file in SDWIS.
Purchased water
64 of the 101 Texas systems above 4.0 ppt list purchased water as their primary source. UCMR 5 doesn't record where the water at a sample point came from, so a high result at an entry point may be a wholesaler's water. Each row says so when SDWIS lists purchased water.
What EPA says the results do not show
"UCMR 5 results do not indicate compliance or noncompliance with the PFAS NPDWR Maximum Contaminant Levels."EPA, ECHO PFAS tools, checked Nov 7, 2026
EPA also notes the data are not current conditions and that UCMR 5 ZIP codes are not definitive service areas. We place systems by the ZIPs they serve and drop ZIPs that fall in the wrong state or county. More on the sources.