City of Primera
PWSID TX0310094 - Harlingen
PFAS was detected in this system, below the final federal limits.
The highest result was PFBA at 13.6 ng/L. Detection below a limit is not a violation and requires no action from the utility.
5,811
people served
1,650
service connections
purchased surface water
primary source
240
sample results
Every compound detected
Highest single result per compound, in nanograms per litre (the same unit as parts per trillion). EPA proposed in May 2026 to rescind the limits marked as withdrawn, so those results are reported without a comparison.
| Compound | Highest result | Federal limit | Reading |
|---|---|---|---|
| PFBA | 13.6 ng/L | none | below limit |
| PFBS | 10.4 ng/L | none | below limit |
| PFHxA | 8.8 ng/L | none | below limit |
| PFPeA | 8.5 ng/L | none | below limit |
| PFHxS | 3.4 ng/L | withdrawn | no current limit |
Counties served
What this does not tell you
These are entry-point results for the system, not one tap. Water mixes between sources, sits in mains and passes through household plumbing. A certified lab test of your own tap is the only thing that answers what you drink, and it is the only route at all for a private well.
How to test your tap waterIf you want to treat it
Reverse osmosis and properly specified activated carbon remove most PFAS at the tap. Certification to NSF/ANSI 53 or 58 with an explicit PFOA and PFOS claim is what separates a PFAS filter from a taste filter.
Which filters actually workSource: EPA Fifth Unregulated Contaminant Monitoring Rule occurrence data, with system detail from EPA SDWIS. Umwelt reports these results as published. Methodology and sources