What the EPA limit means
No federal limit
The EPA has not set an enforceable numeric limit for this contaminant.
—
Health goal (MCLG) — the level with no known health effect. It is a goal, not a legal limit, and is often zero for carcinogens.
UCMR-5
Where these measurements come from. Hover the tag for the EPA programme and years.
Where 4:2 Fts was found
The water suppliers reporting the highest levels, worst first. For lead and copper that is the 90th-percentile result the action level is written against; for Six-Year Review data, the 95th percentile of each system's samples.
| Supplier | City | State | Level vs EPA limit |
|---|---|---|---|
| Emerald Coast Utilities Authority (Ecua) | Pensacola | FL | 0.0076 µg/L No EPA limit set |
| Canton Water Dept | Canton | MA | 0.0030 µg/L No EPA limit set |
Frequently asked questions about 4:2 Fts
What is 4:2 Fts in drinking water?
4:2 Fts is monitored in US public drinking water under EPA rules. Each supplier's result is reported to the EPA and published here with its source and period.
Does the EPA limit 4:2 Fts?
The EPA has not set a numeric Maximum Contaminant Level for 4:2 Fts. It is still measured and reported, so levels can be compared between suppliers.
How common is 4:2 Fts in US tap water?
Of the 9,676 water suppliers with results on file, 2 detected 4:2 Fts — 0% of those tested.