PFAS compliance deadline: 2029, with a proposal to allow 2031

The dates

Source: EPA, Per- and Polyfluoroalkyl Substances (PFAS) in drinking water, page last updated May 18, 2026. Checked on November 7, 2026.

Date	What	Status
2027	Initial monitoring due	Final rule
2029	PFOA and PFOS at 4.0 ppt, running annual average at each sampling point	Final rule
May 18, 2026	EPA proposed letting systems request two more years (to 2031), and proposed rescinding the PFHxS, PFNA, HFPO-DA and Hazard Index limits. PFOA and PFOS stay at 4.0 ppt.	Proposal, not final

What one UCMR 5 result tells you, and what it doesn't

• It tells you a lab measured PFOA or PFOS above 4.0 ppt at a named sample point on a date.
• It doesn't tell you the system is out of line with the rule: UCMR 5 results do not indicate compliance or noncompliance with the PFAS NPDWR Maximum Contaminant Levels (EPA).
• It doesn't tell you the water was the system's own: 64 of the 101 Texas systems above 4.0 ppt list purchased water as their primary source.
• It doesn't tell you what the system has done since. Many acted after reporting.

What it does tell an engineer: which utilities near you will be working through the rule's monitoring and, possibly, treatment decisions before 2029 or 2031. Texas public entities choose engineers on qualifications first (Gov't Code §2254.004), so knowing the record early is ordinary business development.

Checked on November 7, 2026. We re-check EPA's page before each change to this page.