Inorganic chemicals
Monobromoacetic acid in U.S. tap water
21 public water systems across 6 U.S. states report Monobromoacetic acid in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
What it is
A brominated haloacetic acid disinfection byproduct.
Why it's regulated
Part of the broader HAA9 group; monitored without its own enforceable limit.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Kansas City, KS 2024 annual report | 0.43 ug/L | 1.4× the limit |
Within the federal limit (2)
| Water system | Measured |
|---|---|
| Georgetown, TX 2024 annual report | Not detected ug/L |
| Nashville, TN 2023 annual report | Not detected |
Frequently asked
+What is Monobromoacetic acid?
A brominated haloacetic acid disinfection byproduct. Part of the broader HAA9 group; monitored without its own enforceable limit.
+What is the federal limit for Monobromoacetic acid in drinking water?
The federal MCL for Monobromoacetic acid is 0.3 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 Monobromoacetic acid over the federal limit?
1 of the 21 public water systems on The Water Map report Monobromoacetic acid at or above its federal limit, spanning 6 U.S. states. The full list is on this page.
+How can I check if Monobromoacetic 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 Monobromoacetic acid.