Community Water System (CWS) · IA3126052
Groundwater · serves an estimated 59,667 people · across Dubuque
No numeric score yet
5.1 ng/L · sampled 2024
f-dubuque-pfoa
src-ucmr5-2024 · released 2026-01-15
The original published file, referenced from the source record.
Detected at up to 5.1 ng/L (above the 4.0 ng/L federal limit).
Why it matters. Studies associate PFOA exposure with effects on the immune system, cholesterol, liver, and developmental outcomes, and with certain cancers. Because it accumulates, the EPA has set the enforceable limit near the lowest reliably measurable level.
What you can do. Relevant treatment: Reverse osmosis, Activated carbon (GAC), Anion exchange.
Understand Perfluorooctanoic acid (PFOA) →| Substance | Result | Reference | Sampled | Status | Evidence |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 5.1 ng/L | 4.0 ng/L federal MCL (2024) | 2024 | Above guideline | View evidence |
| Perfluorooctane sulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024 | Not detected | View evidence |
| Perfluorohexane sulfonic acid (PFHxS) | < 10 ng/L | 10.0 ng/L federal MCL (2024) | 2024 | Not detected | View evidence |
| Lead (90th percentile) | 5 µg/L | 15 µg/L federal action level | 2021-2023 | Below limit | View evidence |
A federal limit (an MCL or action level) is an enforceable legal cap. A health goal (an MCLG or health benchmark) is a non-enforceable target, often stricter, sometimes zero. A system meeting the legal limit is a compliance fact; it is not a guarantee of no health concern. PurityMap publishes no overall compliance verdict for a system; read each finding against its own reference below.
DUBUQUE WATER WORKS (PWS ID IA3126052) is a public water system serving 59,667 people in Dubuque, Iowa.
DUBUQUE WATER WORKS is on record as drawing from groundwater. The source shapes which contaminants matter most for this system.
PurityMap's record for DUBUQUE WATER WORKS shows 1 finding measured above a benchmark and 3 within benchmark, from 4 evidence records. Every finding links to its source; a substance that was never monitored is shown as pending, not as a pass.
PurityMap does not issue a safety verdict. It publishes DUBUQUE WATER WORKS's measured results against each contaminant's benchmark so you can read them in context. Safety depends on the specific finding, your plumbing, and how the water reaches your tap.
The latest published record for DUBUQUE WATER WORKS is dated 2026-09-16. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.