Inorganic chemicals
Trichloroacetic acid in U.S. tap water
30 public water systems across 8 U.S. states report Trichloroacetic acid in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
What it is
A haloacetic acid disinfection byproduct.
Why it's regulated
One of the five haloacetic acids regulated together as HAA5.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Omaha, NE 2024 annual report | 2.97 mg/L | 49.5× the limit |
Within the federal limit (27)
Trichloroacetic acid by state
Every state where a public water system reports Trichloroacetic acid in its annual report, ranked by systems at or above the federal limit.
Frequently asked
+What is Trichloroacetic acid?
A haloacetic acid disinfection byproduct. One of the five haloacetic acids regulated together as HAA5.
+What is the federal limit for Trichloroacetic acid in drinking water?
The federal Public health goal for Trichloroacetic acid is 0.1 ug/L. The EPA enforces this against the regulated reporting statistic (typically a running annual average or 90th percentile), not a single-sample spike.
+How many U.S. water systems have Trichloroacetic acid over the federal limit?
1 of the 30 public water systems on The Water Map report Trichloroacetic acid at or above its federal limit, spanning 8 U.S. states. The full list is on this page.
+Which states report the most Trichloroacetic acid in their drinking water?
Of the systems on The Water Map, Nebraska (1 system at or above the limit) report the most Trichloroacetic acid exceedances. The state-by-state table on this page lists every state.
+How can I check if Trichloroacetic acid is in my city's tap water?
Search your city on The Water Map (https://www.thewatermap.com/) or browse the list on this page. Every U.S. public water utility is required to publish an annual Consumer Confidence Report that lists every contaminant it measured, including Trichloroacetic acid.