This page summarizes EPA Fifth Unregulated Contaminant Monitoring Rule (UCMR 5, 2023–2025) drinking-water monitoring records linked to ZIP codes in Michigan, 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) | 23 (14.0% of state) | 23 (100.0%) — all detections at/above limit by construction | 0.0058 µg/L | 0.013 µg/L |
| PFOS | 0.004 µg/L (MCL) | 16 (9.8% of state) | 16 (100.0%) — all detections at/above limit by construction | 0.0072 µg/L | 0.011 µg/L |
| PFHxS | 0.01 µg/L (MCL) | 21 (12.8% of state) | 1 (4.8% of detected) | 0.0062 µg/L | 0.03 µg/L |
| PFNA | 0.01 µg/L (MCL) | 1 (0.6% of state) | 0 (0.0% of detected) | 0.0048 µg/L | 0.0048 µg/L |
| HFPO-DA | 0.01 µg/L (MCL) | 1 (0.6% of state) | 0 (0.0% of detected) | 0.0054 µg/L | 0.0054 µg/L |
| PFBS | 2.0 µg/L (HI reference) | 30 (18.3% of state) | not calculated¹ | 0.008 µg/L | 0.049 µg/L |
| Lithium | 7.36 µg/L (reference, not a regulatory limit) | 74 (45.1% of state) | 74 (100.0%) at/above reference | 17.9451 µg/L | 88.0 µg/L |
| PFPeA | — (no federal limit) | 37 (22.6% of state) | — | 0.0048 µg/L | 0.0061 µg/L |
| PFBA | — (no federal limit) | 49 (29.9% of state) | — | 0.0064 µg/L | 0.013 µg/L |
| PFHpA | — (no federal limit) | 1 (0.6% of state) | — | 0.0042 µg/L | 0.0042 µg/L |
| 6:2 FTS | — (no federal limit) | 3 (1.8% of state) | — | 0.0106 µg/L | 0.012 µg/L |
164 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 |
|---|---|---|
| 48009 | 1 | No |
| 48012 | 1 | No |
| 48043 | 1 | No |
| 48045 | 1 | No |
| 48062 | 1 | No |
| 48065 | 1 | No |
| 48066 | 1 | No |
| 48101 | 1 | No |
| 48103 | 3 | No |
| 48104 | 2 | No |
| 48105 | 2 | No |
| 48106 | 2 | No |
| 48107 | 2 | No |
| 48108 | 2 | No |
| 48109 | 2 | No |
| 48113 | 2 | No |
| 48114 | 1 | No |
| 48116 | 1 | No |
| 48131 | 1 | Yes (1) |
| 48133 | 1 | No |
| 48140 | 1 | Yes (1) |
| 48144 | 1 | No |
| 48145 | 1 | No |
| 48157 | 1 | No |
| 48160 | 1 | No |
| 48161 | 1 | Yes (1) |
| 48162 | 1 | No |
| 48166 | 1 | No |
| 48177 | 1 | No |
| 48178 | 2 | No |
| 48182 | 1 | No |
| 48198 | 1 | No |
| 48237 | 1 | No |
| 48317 | 1 | No |
| 48326 | 1 | No |
| 48327 | 2 | No |
| 48328 | 2 | No |
| 48329 | 2 | No |
| 48340 | 1 | No |
| 48341 | 1 | No |
| 48342 | 1 | No |
| 48343 | 1 | No |
| 48346 | 7 | Yes (3) |
| 48380 | 1 | No |
| 48383 | 1 | No |
| 48386 | 1 | No |
| 48423 | 1 | No |
| 48429 | 1 | No |
| 48430 | 2 | No |
| 48439 | 1 | No |
| 48442 | 1 | No |
| 48451 | 1 | No |
| 48458 | 1 | No |
| 48461 | 1 | No |
| 48505 | 1 | No |
| 48601 | 1 | No |
| 48602 | 1 | No |
| 48603 | 1 | No |
| 48604 | 1 | No |
| 48605 | 1 | No |
| 48606 | 1 | No |
| 48607 | 1 | No |
| 48608 | 1 | No |
| 48609 | 1 | No |
| 48615 | 1 | No |
| 48640 | 1 | No |
| 48642 | 1 | No |
| 48706 | 1 | No |
| 48710 | 1 | No |
| 48723 | 1 | No |
| 48801 | 1 | No |
| 48808 | 1 | No |
| 48811 | 1 | No |
| 48813 | 2 | No |
| 48820 | 1 | No |
| 48821 | 1 | No |
| 48823 | 1 | No |
| 48824 | 1 | No |
| 48825 | 1 | No |
| 48835 | 1 | No |
| 48836 | 1 | No |
| 48837 | 1 | No |
| 48838 | 1 | No |
| 48840 | 1 | No |
| 48842 | 1 | No |
| 48843 | 1 | No |
| 48844 | 1 | No |
| 48854 | 1 | No |
| 48855 | 1 | No |
| 48858 | 2 | No |
| 48864 | 1 | No |
| 48867 | 1 | No |
| 48875 | 1 | No |
| 48879 | 1 | No |
| 48880 | 1 | No |
| 48895 | 1 | No |
| 48901 | 1 | No |
| 48906 | 1 | No |
| 48909 | 1 | No |
| 48910 | 1 | No |
| 48911 | 1 | No |
| 48912 | 1 | No |
| 48915 | 1 | No |
| 48916 | 1 | No |
| 48917 | 1 | No |
| 48919 | 1 | No |
| 48922 | 1 | No |
| 48924 | 1 | No |
| 48929 | 1 | No |
| 48930 | 1 | No |
| 48933 | 1 | No |
| 48937 | 1 | No |
| 48951 | 1 | No |
| 49001 | 5 | Yes (2) |
| 49002 | 5 | Yes (2) |
| 49004 | 5 | Yes (2) |
| 49005 | 5 | Yes (2) |
| 49006 | 5 | Yes (2) |
| 49007 | 5 | Yes (2) |
| 49008 | 5 | Yes (2) |
| 49009 | 5 | Yes (2) |
| 49014 | 1 | No |
| 49015 | 1 | No |
| 49017 | 1 | No |
| 49019 | 1 | No |
| 49024 | 5 | Yes (2) |
| 49033 | 1 | No |
| 49037 | 1 | No |
| 49041 | 5 | Yes (2) |
| 49048 | 5 | Yes (2) |
| 49053 | 5 | Yes (2) |
| 49071 | 5 | Yes (2) |
| 49078 | 4 | Yes (1) |
| 49083 | 5 | Yes (2) |
| 49093 | 1 | No |
| 49201 | 1 | No |
| 49202 | 1 | No |
| 49203 | 1 | No |
| 49221 | 1 | No |
| 49228 | 1 | No |
| 49267 | 1 | No |
| 49270 | 1 | Yes (1) |
| 49276 | 1 | No |
| 49286 | 1 | No |
| 49306 | 2 | No |
| 49316 | 1 | No |
| 49321 | 2 | No |
| 49333 | 2 | No |
| 49341 | 3 | No |
| 49412 | 1 | Yes (1) |
| 49417 | 1 | Yes (1) |
| 49421 | 2 | No |
| 49453 | 1 | No |
| 49456 | 1 | Yes (1) |
| 49525 | 2 | No |
| 49544 | 2 | No |
| 49686 | 1 | No |
| 49696 | 1 | No |
| 49721 | 1 | No |
| 49735 | 1 | No |
| 49781 | 1 | No |
| 49788 | 2 | No |
| 49802 | 3 | No |
| 49837 | 1 | Yes (1) |
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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