This page summarizes EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5, 2023–2025) drinking-water monitoring records linked to ZIP codes in Minnesota, as processed for the PFAS Estimator national dataset. Data updated: July 2026.
| Compound | Applicable threshold | ZIP codes detected | At/above threshold | Mean detected | Maximum detected |
|---|---|---|---|---|---|
| PFOA | 0.004 µg/L (MCL) | 11 (6.1% of state) | 11 (100.0%) — all detections at/above limit by construction | 0.0096 µg/L | 0.0237 µg/L |
| PFOS | 0.004 µg/L (MCL) | 12 (6.7% of state) | 12 (100.0%) — all detections at/above limit by construction | 0.0078 µg/L | 0.018 µg/L |
| PFHxS | 0.01 µg/L (MCL) | 17 (9.5% of state) | 4 (23.5% of detected) | 0.0087 µg/L | 0.0342 µg/L |
| PFBS | 2.0 µg/L (HI reference) | 12 (6.7% of state) | not calculated¹ | 0.0051 µg/L | 0.0096 µg/L |
| Lithium | 7.36 µg/L (reference, not a regulatory limit) | 102 (57.0% of state) | 102 (100.0%) at/above reference | 27.7784 µg/L | 99.6 µg/L |
| PFPeA | — (no federal limit) | 27 (15.1% of state) | — | 0.0063 µg/L | 0.024 µg/L |
| PFBA | — (no federal limit) | 111 (62.0% of state) | — | 0.0615 µg/L | 1.7 µg/L |
| PFHpA | — (no federal limit) | 2 (1.1% of state) | — | 0.0036 µg/L | 0.0036 µg/L |
179 ZIP codes with at least one recorded PFAS detection. Click a ZIP code to view its full compound-level results.
Results are based on EPA UCMR 5 monitoring data (2023–2025), linked to ZIP codes via Public Water System Identifier. Non-detections are not present in this analytic dataset. For each compound and ZIP code, the highest observed concentration across the monitoring period is retained; this characterizes the upper bound of observed drinking-water concentrations, not a long-term average or an individual exposure estimate. A single water system may serve multiple ZIP codes, so the same monitoring record can appear for more than one ZIP in this table. ZIP-code assignment reflects water-system service area geography and does not establish individual household exposure. Private wells are not represented unless served by a monitored public water system. PFOA and PFOS are reported by detection prevalence because the UCMR 5 reporting limit equals their federal MCL. A full PFBS Hazard Index is not calculated because co-located, same-event multi-compound readings are not retained in this dataset. Lithium has no federal Maximum Contaminant Level; 7.36 µg/L is an evidence-based reference concentration from a prospective cohort study, not a regulatory threshold.
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