VOCs & pesticides
1,2,3-TCP in U.S. tap water
8 public water systems across 4 U.S. states report 1,2,3-TCP in their annual Consumer Confidence Report. 1 sit at or above the federal limit.
At or above the federal limit (1)
| Water system | Measured | vs. limit |
|---|---|---|
| Lakewood, NJ 2025 annual report | 0.01 ug/L | 20.0× the limit |
Within the federal limit (7)
| Water system | Measured |
|---|---|
| Elizabeth, NJ 2024 annual report | 0.02 ug/L |
| Clovis, CA 2024 annual report | 0.76 ng/L |
| Bakersfield, CA 2024 annual report | Not detected ng/L |
| Cleveland, OH 2024 annual report | Not detected |
| Nashville, TN 2023 annual report | Not detected |
| Pomona, CA 2024 annual report | Not detected ng/L |
| Stockton, CA 2024 annual report | Not detected ng/L |
Frequently asked
+What is 1,2,3-TCP?
1,2,3-TCP is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for 1,2,3-TCP in drinking water?
The federal MCL for 1,2,3-TCP is 5 ng/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 1,2,3-TCP over the federal limit?
1 of the 8 public water systems on The Water Map report 1,2,3-TCP at or above its federal limit, spanning 4 U.S. states. The full list is on this page.
+How can I check if 1,2,3-TCP 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 1,2,3-TCP.