This page summarizes EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5, 2023–2025) drinking-water monitoring records linked to ZIP codes in Idaho, 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) | 1 (1.6% of state) | 1 (100.0%) — all detections at/above limit by construction | 0.0059 µg/L | 0.0059 µg/L |
| PFOS | 0.004 µg/L (MCL) | 5 (8.2% of state) | 5 (100.0%) — all detections at/above limit by construction | 0.0105 µg/L | 0.0282 µg/L |
| PFHxS | 0.01 µg/L (MCL) | 6 (9.8% of state) | 2 (33.3% of detected) | 0.0087 µg/L | 0.0254 µg/L |
| PFNA | 0.01 µg/L (MCL) | 2 (3.3% of state) | 1 (50.0% of detected) | 0.0296 µg/L | 0.051 µg/L |
| PFBS | 2.0 µg/L (HI reference) | 5 (8.2% of state) | not calculated¹ | 0.0048 µg/L | 0.0067 µg/L |
| Lithium | 7.36 µg/L (reference, not a regulatory limit) | 59 (96.7% of state) | 59 (100.0%) at/above reference | 44.6169 µg/L | 150.0 µg/L |
| PFPeA | — (no federal limit) | 6 (9.8% of state) | — | 0.0056 µg/L | 0.008 µg/L |
61 ZIP codes with at least one recorded PFAS detection. Click a ZIP code to view its full compound-level results.
| ZIP code | Compounds detected | At/above threshold |
|---|---|---|
| 83201 | 1 | No |
| 83202 | 1 | No |
| 83203 | 1 | No |
| 83204 | 1 | No |
| 83205 | 1 | No |
| 83206 | 1 | No |
| 83209 | 1 | No |
| 83211 | 1 | No |
| 83221 | 1 | No |
| 83274 | 2 | No |
| 83301 | 1 | No |
| 83303 | 1 | No |
| 83316 | 1 | No |
| 83318 | 1 | No |
| 83336 | 1 | No |
| 83338 | 1 | No |
| 83340 | 1 | No |
| 83350 | 1 | No |
| 83401 | 1 | No |
| 83402 | 1 | No |
| 83403 | 1 | No |
| 83404 | 1 | No |
| 83405 | 1 | No |
| 83406 | 1 | No |
| 83440 | 1 | No |
| 83442 | 1 | No |
| 83445 | 1 | No |
| 83501 | 3 | No |
| 83530 | 1 | No |
| 83539 | 1 | No |
| 83605 | 1 | No |
| 83607 | 1 | No |
| 83616 | 1 | No |
| 83617 | 1 | No |
| 83634 | 1 | No |
| 83642 | 3 | Yes (1) |
| 83644 | 1 | No |
| 83646 | 3 | Yes (1) |
| 83648 | 3 | Yes (1) |
| 83651 | 1 | No |
| 83652 | 1 | No |
| 83653 | 1 | No |
| 83661 | 2 | No |
| 83669 | 1 | No |
| 83672 | 1 | No |
| 83680 | 3 | Yes (1) |
| 83686 | 1 | No |
| 83687 | 1 | No |
| 83702 | 1 | No |
| 83703 | 1 | No |
| 83704 | 7 | Yes (3) |
| 83705 | 1 | No |
| 83706 | 1 | No |
| 83709 | 1 | No |
| 83712 | 1 | No |
| 83713 | 1 | No |
| 83714 | 6 | Yes (2) |
| 83716 | 1 | No |
| 83725 | 1 | No |
| 83855 | 1 | No |
| 83858 | 1 | No |
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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