Community Water System (CWS) · CA4110021
Surface Water · serves an estimated 36,556 people · across Estero Improvement District
No numeric score yet
sampled 2024
f-estero improvement district-pfoa
src-ucmr5-2024 · released 2026-01-15
The original published file, referenced from the source record.
Not detected in the 2024 UCMR5 round.
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.
Understand Perfluorooctanoic acid (PFOA) →| Substance | Result | Reference | Sampled | Status | Evidence |
|---|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024 | Not detected | 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) | 0 µg/L | 15 µg/L federal action level | 2023-2025 | 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.
ESTERO MUNICIPAL IMPROVEMENT DISTRICT (PWS ID CA4110021) is a public water system serving 36,556 people in Estero Improvement District, California.
ESTERO MUNICIPAL IMPROVEMENT DISTRICT is on record as drawing from surface water. The source shapes which contaminants matter most for this system.
PurityMap's record for ESTERO MUNICIPAL IMPROVEMENT DISTRICT shows 0 findings measured above a benchmark and 4 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 ESTERO MUNICIPAL IMPROVEMENT DISTRICT'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 ESTERO MUNICIPAL IMPROVEMENT DISTRICT is dated 2026-09-16. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.