Does a detection mean the water is unsafe or out of compliance?

No. UCMR 5 is monitoring data and does not indicate compliance or noncompliance with any drinking-water standard. It reports the highest single detected result at the entry point, which is information you can act on by testing your own tap and choosing a certified filter.

PFAS detected in Texas water systems

Q: Which Texas water systems had PFAS detected in EPA UCMR 5?

EPA UCMR 5 detected PFOA or PFOS at or above 6 parts per trillion in 23 large Texas public water systems (each serving more than 10,000 people). Select a system to see the specific PFAS and highest levels detected.

EPA UCMR 5 monitoring (2023–2025) detected PFOA or PFOS at or above 6 parts per trillion in these 23 large Texas public water systems, each serving more than 10,000 people. Select a system to see exactly what was detected and the certified filters that reduce it.

Texas systems, highest detections first

Water system	PFOA (ppt)	PFOS (ppt)	vs. 4 ppt reference
City of Grand Prairie	4.9	82	20.5×
City of Abilene	7.7	30	7.5×
City of Boerne	6	26.3	6.6×
City of Pflugerville	6.3	14.4	3.6×
Manville WSC	5.9	12.4	3.1×
City of Terrell	—	10.4	2.6×
Brownsville Public Utilities Board	4.7	9.2	2.3×
City of Huntsville	6	8.9	2.2×
El Paso Water Utilities Public Service B	—	8.5	2.1×
City of Fort Worth	8.3	7.3	2.1×
Cash SUD	—	8.1	2×
City of Haltom City	5.6	7.7	1.9×
Windermere Community	—	7.5	1.9×
City of Donna	—	7.4	1.9×
City of Greenville, TX	—	7.3	1.8×
City of Livingston, TX	4.7	6.9	1.7×
Sharyland WSC	4.3	6.8	1.7×
Clear Lake City Water Authority	4	6.7	1.7×
Dallas Water Utility	6.3	5.1	1.6×
City of Webster	—	6.2	1.6×
Mountain Peak SUD	—	6.2	1.6×
City of Baytown	—	6	1.5×
City of Port Lavaca	6	4.7	1.5×

Highest single EPA UCMR 5 detections (2023–2025), in parts per trillion. The last column is the multiple of the 4 ppt federal reference level for PFOA/PFOS — shown as context only, not a compliance or health determination. — means the compound was not detected at or above 6 ppt.

Not sure what's in your own water? Test it first, then run the selector for a recommendation matched to your home, or read what PFAS is and how it's removed.