Other
Twofourd in U.S. tap water
22 public water systems across 9 U.S. states report Twofourd in their annual Consumer Confidence Report. None currently sit at or above the federal limit.
Within the federal limit (22)
Frequently asked
+What is Twofourd?
Twofourd is a contaminant some U.S. public water utilities measure and report in their annual Consumer Confidence Report.
+What is the federal limit for Twofourd in drinking water?
The federal MCL for Twofourd is 0.07 mg/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 Twofourd over the federal limit?
Zero of the 22 public water systems in The Water Map dataset currently report Twofourd at or above its federal limit.
+How can I check if Twofourd 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 Twofourd.