PFAS in Potrero Elementary School water
Is the water here over the federal PFAS limit?
Yes — 4 of them were. The highest, PFOA, came back at 47× the federal MCL.
That doesn't mean the water is unsafe to drink today — these limits are set for a lifetime of exposure, and your utility has until 2029 to comply. But it does mean this is worth acting on, and effective point-of-use treatment is available at a range of prices.
What to do about it
Fit a reverse-osmosis filter on the tap you drink from. A properly maintained reverse-osmosis system can substantially reduce the PFAS detected here, including the short-chain compounds that activated carbon removes less consistently. Look for NSF/ANSI 53 or 58 certification. A standard carbon pitcher should not be relied on for these unless the specific product has independent PFAS test data.
- Reverse osmosis (point-of-use) — Removes ~90–99% of PFAS (long- and short-chain) plus most dissolved metals, nitrate and fluoride — the broadest single fix. peer-reviewed
- Anion-exchange resin filter — Removes both long- AND short-chain PFAS better than carbon; also targets nitrate and chromium-6. peer-reviewed
- Certified granular activated carbon (GAC) filter — Good for long-chain PFAS (PFOA/PFOS) and for disinfection byproducts and VOCs — but short-chain PFAS break through quickly. peer-reviewed
- Brita Elite pitcher filter — Removes ~78% of PFOA/PFOS in independent testing — modest, and ONLY the Elite (not Standard/Stream). industry
- Standard carbon pitcher (Brita Standard/Stream, most “water filter” pitchers) — Does NOT remove PFAS. Built for taste/chlorine, not forever chemicals. industry
- Boiling the water — Does NOT remove PFAS, nitrate, or algal toxins — and CONCENTRATES them as water evaporates. regulatory
Important for this system: short-chain PFAS were detected here. These tend to break through activated carbon sooner than longer-chain compounds, so a carbon pitcher should not be assumed to reduce them reliably without product-specific test data — reverse osmosis or anion exchange is the more dependable option.
We sell nothing and take no affiliate commission — see how the filter types compare.
The full results
Every PFAS the EPA found here, highest first. ng/L is nanograms per litre — roughly one drop in an Olympic pool.
| Compound | Level found | Federal MCL | Status | Our verdict |
|---|---|---|---|---|
| PFHxS | 250.2 ng/L | 10 ng/L | 25× the MCL | Real — regulated as a mixture |
| PFOA | 188.3 ng/L | 4 ng/L | 47× the MCL | Real, newly regulated |
| PFHxA | 95.2 ng/L | No federal MCL | no federal limit | Short-chain, ubiquitous, unregulated |
| PFHpA | 72.7 ng/L | No federal MCL | no federal limit | — |
| PFOS | 64.2 ng/L | 4 ng/L | 16× the MCL | Real — regulated, and it lingers |
| PFPeA | 62.0 ng/L | No federal MCL | no federal limit | Everywhere in your water — and nobody regulates it |
| PFBA | 13.1 ng/L | No federal MCL | no federal limit | Short-chain, ubiquitous, unregulated |
| PFNA | 10.2 ng/L | 10 ng/L | 1.0× the MCL | Real, but uncommon |
| PFBS | 5.9 ng/L | No federal MCL | no federal limit | — |
How to read the verdict: we grade every compound on how worried to actually be — Real (act on it), Depends (on your situation), Complicated (a genuine trade-off or still contested), Mild (mostly overblown). A dash means we haven't reviewed it yet — not that it's safe. Every compound links to its full, cited page.
Source: US EPA, Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) occurrence data, 2023–2025. Levels are the highest value reported at this system. Verdicts are Embr's own calibrated judgment — see our methodology. This is not medical advice.
Part of PFAS in US Tap Water — the national picture.
What’s being done about it
Regulatory status as of July 2026Yes — there is a federal response, and it is actively changing. In 2024 the EPA set the first nationwide, enforceable drinking-water limits for PFAS: 4 parts per trillion each for PFOA and PFOS, plus limits for PFHxS, PFNA and GenX (HFPO-DA). Public water systems must monitor for these and, where they are exceeded, reduce them.
The limit exceeded here for PFOA, PFOS is the firm part of the rule: the EPA reaffirmed the PFOA and PFOS limits in July 2026 and separately proposed giving systems until 2031 to come into compliance.
The limit exceeded here for PFHxS, PFNA is unsettled: as of July 2026 the EPA has proposed to rescind the federal limits for PFHxS, PFNA and GenX and reconsider how they are regulated, with a final rule expected in 2026. Treat this exceedance as a health-relevant signal, not a settled legal violation.
What that means for you: your utility is required to test for these PFAS and report results in its annual Consumer Confidence Report, and the federal picture is moving month to month — which is exactly what we track.
No specific federal enforcement action for this system was found in our sources as of July 2026. That is not evidence none exists — it means none is recorded in the datasets we join.
Federal-rule status is summarized from the EPA Safe Drinking Water Act PFAS pages and is re-verified as the rule changes. This is regulatory context, not legal or medical advice.